Relevant bibliographies by topics / Cohesive soils

Academic literature on the topic 'Cohesive soils'

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Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Cohesive soils"

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Gao, Xiaojing, Qiusheng Wang, Chongbang Xu, and Ruilin Su. "Experimental Study on Critical Shear Stress of Cohesive Soils and Soil Mixtures." Transactions of the ASABE 64, no. 2 (2021): 587–600. http://dx.doi.org/10.13031/trans.14065.

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HighlightsErosion tests were performed to study the critical shear stress of cohesive soils and soil mixtures.Linear relationships were observed between critical shear stress and cohesion of cohesive soils.Mixture critical shear stress relates to noncohesive particle size and cohesive soil erodibility.A formula for calculating the critical shear stress of soil mixtures is proposed and verified.Abstract. The incipient motion of soil is an important engineering property that impacts reservoir sedimentation, stable channel design, river bed degradation, and dam breach. Due to numerous factors influencing the erodibility parameters, the study of critical shear stress (tc) of cohesive soils and soil mixtures is still far from mature. In this study, erosion experiments were conducted to investigate the influence of soil properties on the tc of remolded cohesive soils and cohesive and noncohesive soil mixtures with mud contents varying from 0% to 100% using an erosion function apparatus (EFA). For cohesive soils, direct linear relationships were observed between tc and cohesion (c). The critical shear stress for soil mixture (tcm) erosion increased monotonically with an increase in mud content (pm). The median diameter of noncohesive soil (Ds), the void ratio (e), and the organic content of cohesive soil also influenced tcm. A formula for calculating tcm considering the effect of pm and the tc of noncohesive soil and pure mud was developed. The proposed formula was validated using experimental data from the present and previous research, and it can reproduce the variation of tcm for reconstituted soil mixtures. To use the proposed formula to predict the tcm for artificial engineering problems, experimental erosion tests should be performed. Future research should further test the proposed formula based on additional experimental data. Keywords: Cohesive and noncohesive soil mixture, Critical shear stress, Erodibility, Mud content, Soil property.
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Khazratov, A. N., O. Sh Bazarov, A. R. Jumayev, F. F. Bobomurodov, and N. Z. Mamatov. "Influence of cohesion strength in cohesive soils onchannel bed erosion." E3S Web of Conferences 410 (2023): 05018. http://dx.doi.org/10.1051/e3sconf/202341005018.

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The results of experimental studies on the mechanical properties of cohesive soils associated with the use in the study of the erosion process are presented. The influence of the cohesion strength of cohesive soil on erosion is described. The relationship between the erosionflow velocities and cohesion strength has been obtained.
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Nnamani, Chidiebere Henry. "The Chemical and Mineralogical Composition and Their Effects on Strength Parameters of Cohesive Soil Developed over Enugu Shale." European Journal of Environment and Earth Sciences 3, no. 1 (January 29, 2022): 28–35. http://dx.doi.org/10.24018/ejgeo.2022.3.1.234.

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The results of chemical and mineralogical composition of cohesive soils developed over Enugu Shale, as well as the effects on the strength parameters are presented in this paper. The strength parameters were determined in the cohesive soil specimens in the study area, while the chemical and mineralogical tests were done on the representative soil types from the study area. Some correlations between chemical composition and strength parameters of cohesion and angle of internal friction as well as other physical parameters such as liquid limit, plastic limit, plasticity index and activity of soil were obtained. The effects of chemical and mineralogical composition on strength parameters, based on the correlation between chemical composition and strength parameters (cohesion and angle of internal friction) were examined. The results show that chemical and mineralogical compositions significantly affect the angle of internal friction and cohesion thereby impacting on the strength of cohesive soils developed over Enugu Shale.
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Estikhamah, Fithri, and Dian Purnamawati Solin. "Correlation Between Cone Resistance Values and Cohesion Values in Cohesive Soils (Case Study in Gunung Anyar District)." E3S Web of Conferences 328 (2021): 01005. http://dx.doi.org/10.1051/e3sconf/202132801005.

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The physical and mechanical properties of the soil can be determined based on laboratory tests by testing soil samples obtained from field drilling. At one point it can be done simultaneously between SPT testing and drilling. Therefore, it can be known simultaneously the value of N-SPT with the physical and mechanical properties of the soil. The purpose of this study was to obtain a relationship between the cone resistance value (qc) obtained in the field and the cohesion value for cohesive soil types. This study uses primary data, and secondary data. The results of the correlation between the cone resistance value (qc) obtained in the field and the cohesion value for cohesive soil types show a strong correlation. This is indicated by the regression value which reaches a value of 0.75, which is 0.7809. The regression equation obtained is y = 0.0138x – 0.0063. The coefficient of the cone resistance value is 0.0138, indicating that every 1 constant increase in the cone resistance value variable will increase the cohesive value in the cohesive soil by 0.0138. The positive regression coefficient indicates that the higher the cone resistance value (qc), the higher the value of cohesion (c) for cohesive soils.
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Mahabub, Md Shakil, and Mohammad Rafikul Islam. "The Subsoil Characterization of Matarbari Ultra Super Critical Coal-Fired Power Project, Bangladesh." Volume 5 - 2020, Issue 9 - September 5, no. 9 (October 4, 2020): 931–45. http://dx.doi.org/10.38124/ijisrt20sep699.

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In this research, the subsoil characteristics and geotechnical issues have been evaluated for ground improvement, land development and design facilitation of Matarbari Ultra Super Critical Coal-Fired Power Project, Bangladesh. The subsoil conditions and geotechnical issues are addressed by determining the geotechnical parameters of soil. The soil characteristics are obtained from soil investigation and executed under land development for the procurement of power plant facilities. The American Society for Testing and Materials (ASTM International) standard is used to estimate all the soil parameters in field and laboratory tests. The measured soil properties establish the area consists mainly of two types of soils, i.e., Cohesive Clayey and non-cohesive Sandy soils. The cohesive soils are mostly composed of gray to dark gray CLAY, CLAY with Sand, SILT with Sand, and Sandy CLAY with fine to mediumgrained Sand. The upper cohesive soil layer (Ac-1) is very soft to soft, normal to slightly consolidated with low undrained cohesion. This layer is expected to have a high potential for differential settlement because of the proposed design load. The lower cohesive soils (Ac-2 and Ac-3) are firm to very stiff and moderately over consolidated. These soils have moderate to high shear strengths with low compressibility relating to the expected range of the design loads. The non-cohesive Sandy soils consist of dark gray to gray SAND, SAND with Silt, Silty SAND, and Clayey SAND. The Sandy soils are poorly graded and loose to very loose at the upper part (As-1) and medium dense to dense in lower parts (As-2 & As-3) that expect less immediate settlement when a load placed on that. Geotechnical site conditions are challenging and deplorable. The soft soil layer Ac-1 (with As-1) complicates the design, especially in terms of foundation soil instability and settlement for certain structure types. Ground improvement techniques such as prefabricated vertical drain (PVD) and deep mixing method (DMM) can be applied to mitigate these challenges and for the improvement of the soft ground of the project area.
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Gong, Mingze, Sivar Azadi, Adrien Gans, Philippe Gondret, and Alban Sauret. "Erosion of a cohesive granular material by an impinging turbulent jet." EPJ Web of Conferences 249 (2021): 08011. http://dx.doi.org/10.1051/epjconf/202124908011.

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The erosion of a cohesive soil by an impinging turbulent jet is observed, for instance, during the landing of a spacecraft or involved in the so-called jet erosion test. To provide a quantitative understanding of this situation for cohesive soils, we perform experiments using a model cohesion controlled granular material that allows us to finely tune the cohesion between particles while keeping the other properties constant. We investigate the response of this cohesive granular bed when subjected to an impinging normal turbulent jet. We characterize experimentally the effects of the cohesion on the erosion threshold and the development of the crater. We demonstrate that the results can be rationalized by introducing a cohesive Shields number that accounts for the inter-particles cohesion force. The results of our experiments highlight the crucial role of cohesion in erosion processes.
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Gosk, Wojciech. "The use of cohesive soils improved with lime as an example of circular economy in earthworks." Inżynieria Bezpieczeństwa Obiektów Antropogenicznych, no. 3 (September 30, 2022): 10–20. http://dx.doi.org/10.37105/iboa.146.

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A common practice in civil engineering during earthworks is the usual replacement of cohesive soils (fine soils), excavated during earthworks, with non-cohesive soils (coarse soils). Until recently, such a procedure was dictated primarily by economic and technical reasons. From an economic point of view, the ease of access and therefore low cost of using such soils instead of cohesive soils was crucial. The technical reason is, above all, the ease of compacting fine soils (as opposed to cohesive soils) and well-developed and well-known engineering methods for controlling their compaction. The situation changed radically when the new environmental regulations came into force and enforcement by the inspection authorities began. Currently, soil removed from a construction site according to regulations should be classified as waste. This fact has completely changed the approach of participants in the construction process to the use of local soils, especially cohesive soils (e.g. clays). Their use "on site" has stopped being an expensive option and has become a necessity. This paper presents aspects of the use of lime-improved cohesive soils that can be successfully used on site as excavation backfill. Problems related to the proper preparation of soil-lime composites are described, as well as the results of compaction tests. The paper presents the author's own methodology for selecting the content of quicklime in the soil-lime composite.
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Świdziński, Waldemar, Jacek Mierczyński, and Agata Mikos. "Response of Partially Saturated Non-cohesive Soils." Archives of Hydro-Engineering and Environmental Mechanics 64, no. 3-4 (December 1, 2017): 187–207. http://dx.doi.org/10.1515/heem-2017-0012.

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AbstractThis paper analyses and discusses experimental results of undrained triaxial tests. The tests were performed on non-cohesive partially saturated soil samples subjected to monotonic and cyclic loading. The tests were aimed at determining the influence of saturation degree on soil’s undrained response (shear strength, excess pore pressure generation). The saturation of samples was monitored by checking Skempton’s parameter B. Additionally, seismic P-wave velocity measurements were carried out on samples characterized by various degrees of saturation. The tests clearly showed that liquefaction may also take place in non-cohesive soils that are not fully saturated and that the liquefaction potential of such soils strongly depends on the B parameter.
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Eshev, Sobir, Mahmud Rahmatov, Alisher Khazratov, Nurbek Mamatov, Jasur Sagdiyev, and Mustafo Berdiev. "Critical flow velocities in cohesive saline soils." E3S Web of Conferences 264 (2021): 03071. http://dx.doi.org/10.1051/e3sconf/202126403071.

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The article discusses the issue of determining non-erosion velocities for cohesive saline soil at the bottom and slopes of canals. Based on the formulas of Ts.E. Mirtskhulava for the determination of non-eroding velocities of water flow in cohesive soils, equations for determining non-eroding velocities for cohesive saline soil are proposed. A brief technique for conducting laboratory experiments and modeling of saline soil is presented. Based on the obtained data of laboratory experiments, the dependences for determining the non-eroding velocities of the water flow in the channels of the cohesive saline soils are obtained.
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Zabielska-Adamska, Katarzyna. "Characteristics of Compacted Fly Ash as a Transitional Soil." Materials 13, no. 6 (March 19, 2020): 1387. http://dx.doi.org/10.3390/ma13061387.

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Cohesive and non-cohesive soils show a number of properties typical of a given category. Cohesive soils are characterized by cohesion, and the properties of compacted soils closely depend on moisture at compaction. However, many researchers have found the existence of so-called mixed or transitional soils. Compacted transitional soils, macroscopically recognized as non-cohesive, are characterized by mechanical properties and hydraulic conductivity which are strictly dependent on the moisture content at compaction. The aim of this work is to show the influence of the content of fine particles in fly ash on the variation of California Bearing Ratio (CBR) values as a parameter strictly dependent on initial compaction. The CBR values were interpreted in terms of moisture at compaction, void ratio and intergranular void ratio. Three different research samples were selected with fine contents of 45%, 55% and 70%; all samples corresponded in terms of grading with sandy silt. Fly ash containing only non-plastic fines behaved as cohesive soils despite the lack of plasticity. The CBR values decreased with increasing moisture at compaction or void ratio. The CBR values, plotted as a function of the intergranular void ratio, have lower penetration resistance together with fine content.
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Dissertations / Theses on the topic "Cohesive soils"

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Mobley, Thomas Jackson Melville Joel G. "Erodibility testing of cohesive soils." Auburn, Ala, 2009. http://hdl.handle.net/10415/1776.

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Mattar, Joe. "An investigation of tunnel-soil-pile interaction in cohesive soils /." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112577.

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Underground tunnels are considered to be a vital infrastructure component in most cities around the world. Careful planning is always necessary to ensure minimum impact on nearby surface and subsurface structures. This thesis describes the experimental and numerical investigations carried out at McGill University to examine the effect of existing pile foundation on the stresses developing in a newly constructed tunnel supported by a flexible lining system. A small scale testing facility was designed and built to simulate the process of tunnel excavation and lining installation in the close vicinity of pre-installed piles. Lining stresses were measured for different separation distances between the tunnel and the existing piles. Significant decrease in circumferential stresses was observed when the lining was installed at a distance that ranges between one to three times the tunnel diameter from the piles. Two-dimensional finite element analyses were also conducted to investigate the different aspects of the pile-soil-lining interaction including lining deformation, axial forces and bending moments. The measured lining stresses agreed with those obtained using finite element analysis. The results presented in this study provided an insight into understanding an important aspect of this soil-structure interaction problem.
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Kim, Dong Gyou. "Development of a constitutive model for resilient modulus of cohesive soils." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1078246971.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xxvi, 252 p.; also includes graphics. Includes abstract and vita. Co-advisors: Frank M. Croft and Tarunja S. Batalia, Dept. of Civil Engineering. Includes bibliographical references (p. 122-131).
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Beadle, Michael E. "Settlement induced by tunnelling in cohesive-frictional soils." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21081.pdf.

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Mostafa, Khaled F. "Numerical Modeling of Dynamic Compaction in Cohesive Soils." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1286904792.

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Aubeny, Charles Paul. "Rational interpretation of in-situ tests in cohesive soils." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13198.

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Kwok, Leung Cheung. "A study of cohesive-frictional soils under dynamic loading." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201916.

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Many previous studies have been focused on the behaviour homogeneous granular soils under the quasi-static loading, however, various soil types exist in the field. Therefore, based on the evaluation of these previous studies, an extensive study has been addressed to expose the dynamic behaviour of cohesive-frictional soils associated with the effects of fines content, the effect of moisture content and the type of impact regime. The proposed study mainly investigates the behaviour of sand – clay mixtures to impact loading, both from a loaded plate dropped from different heights and one dropped repeatedly from a fixed height. The Aberdeen beach sand and the Teuchan clay were used for the study and mixed in different proportions to create soils of varying proportions. The six soil samples used have known volumetric proportions of sand : clay and the tests were carried out under the dry condition and two other moisture contents. The results determine the optimal percentage of fines content and its related moisture condition to obtain more stable performance of the granular soils under dynamic compaction. It can be implemented to enhance the quality of ground improvement techniques for the construction. A Soil Model Tester for 2-Dimension program (SM2D) [Chan (1988)] was used to modify the existing material model before being used for Finite Element simulation. The impact test results were used to verify the numerical model developed using an explicit u-w schemebased finite element program, GLADYS2E [Chan et al. (1992, 1994)]. Such use of explicit schemes requires the use of time step lengths which are smaller than a critical value, in order that stability and accuracy of solution are ensured. A semi-empirical formula has been developed for the critical time step determination using MATLAB.
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Taylor, Paul. "Fast shearing of cohesive soils using ring shear apparatus." Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/102336/.

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Residual shear strength is a fundamental property of cohesive soils and is the governing parameter in many slope stability problems, particularly the reactivation of landslides. Traditionally, residual strengths are determined in the laboratory at slow drained rates of shearing using either shear boxes with reversals or ring shear apparatus. Many catastrophic landslides have been triggered by seismic loading inducing fast rates of shear. Interest has therefore developed in laboratory shear testing at faster rates and over greater displacements to establish fast residual shear strengths. This thesis presents results from testing using the Imperial College-Norwegian Geotechnical Institute Ring Shear Apparatus modified to conduct shearing at velocities up to 1 m/min. The variation of residual strengths as shear rate increases is investigated in association with soil grading and plasticity and also with the morphology of the shear zone. A novel set of undulating interfaces are used to investigate the influence of shear zone waviness. The research concludes that as shear rate is increased three types of fast residual shear strength variation may occur: (i) little variation from the slow residual shear strength, (ii) a continuous increase above the slow residual shear strength or (iii) an initial increase followed by a decrease to levels significantly below the slow residual shear strength. Increases in fast strength are attributed to particle disorientation and viscous effects. Falls in fast residual shear strength are attributed to the generation of positive pore water pressure in the shear zone, as a result of a pumping effect induced by wavy or inclined shear zones. Computational modelling of this pumping effect is undertaken using consolidation theory. Fast peak strengths and slow peak strengths after fast shearing are also investigated. Finally, the influence on slow residual shear strength of shear zones with undulations parallel to the shear direction are studied both mathematically, and using the Bromhead Ring Shear Apparatus.
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Salem, Hicham. "A Practical Approach to the Erodibility of Cohesive Soils." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39673.

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A set of solutions to the cohesive soil erosion problem were developed through this study. A first device, the Erosionometer, was developed to perform a quick and reliable test to determine the critical shear stress of soils. The Erosionometer is based on physical shearing of the soil surface and has been calibrated through comparison with piston flume measurements of critical shear stress for entrainment of various fluvial bed sediments. This device is portable, easy to deploy in the field and in the laboratory and allows engineers and researchers to cover a sizeable terrain by performing many tests in a short timeframe, with immediate results. A modification to the Erosionometer was made to allow for subjecting the soil sample to a pressure differential while testing for critical shear stress. The added functionality is intended for investigating the effect of pressure gradient on the erodibility of cohesive soils by allowing for the erosion test to be conducted under a high pressure head while the other face of the sample (away from the flow) is maintained at zero head. Testing demonstrated that a positive pressure gradient on the eroding side (high pressure on flow side) can significantly increase the critical shear stress of cohesive soils, which is in line with other research available in the literature. The results show a simple linear relation between pressure differential and critical shear stress. Practical implications of these results are discussed. A second device, the Erosion Rate Meter, or ERM, was developed to test cohesive soil samples to determine the rate of erosion under various levels of bed shear stress. This device, while being portable and fast to setup and run, is a very realistic simulation of the flow-bed interaction and allows for a direct measurement of bed shear stress on the soil sample and a precise measurement of the erosion rate. An obvious outcome of using the ERM is the easy development of erosion rate vs. bed shear stress relationships or models to characterize the different soils for design projects or further research. Of the 16 tested cohesive soils, all but two demonstrated a linear relation between erosion rate and bed shear stress. The testing systems and methods developed in this research provide a comprehensive solution to the erodibility of cohesive soils from investigation to design. Significant improvements are achieved over existing systems in the speed, reliability, accuracy, and cost of estimating the erodibility of cohesive soils.
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Akinola, Akinrotimi Idowu. "Temporal and Thermal Effects on Fluvial Erosion of Cohesive Streambank Soils." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/96768.

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In the United States, the annual cost of on-site soil erosion problems such as soil and nutrient losses, and off-site soil erosion problems such as sedimentation of lakes and river, loss of navigable waterways, flooding and water quality impairment, has been estimated at 44 billion USD (Pimentel, 1995; Telles, 2011). While eroding sediment sources can either be from land or from stream/river systems, the erosion from streambanks can be quite significant, reaching up to 80% of sediment leaving a watershed (Simon et al 2002; Simon and Rinaldi 2006). Despite many decades of research one the erosion of cohesive soils by flowing water (fluvial erosion), this significant aspect of environmental sustainability and engineering is still poorly understood. While past studies have given invaluable insight into fluvial erosion, this process is still poorly understood. Therefore, the objective of this dissertation was to examine the relationship between time and erosion resistance of remolded cohesive soils, and to quantify and model the effects soil and water temperature on the fluvial erosion of cohesive soils First, erosion tests were performed to investigate how soil erosion resistance develops over time using three natural soils and testing in a laboratory water channel. Results showed that the erosion rate of the soils decreased significantly over the time since the soils were wetted. This study indicates researchers need to report their sample preparation methods in detail, including the time between sample wetting and sample testing. Second, erosion tests were performed at multiple soil and water temperatures. Results showed that increases in water temperature led to increased erosion rates while increases in soil temperature resulted in decreased erosion rate. When soil and water temperatures were equal, erosion results were not significantly different. Results also showed a linear relationship between erosion rate and the difference between soil and water temperatures, indicating erosion resistance decreased as heat energy was added to the soil. Lastly, two common erosion models (the excess shear stress and the Wilson models) were evaluated, and were modified to account for soil and water temperature effects. Results showed that, compared to the original models, the modified models were better in predicting erosion rates. However, significant error between model predictions and measured erosion rates still existed. Overall, these results improve the current state of knowledge of how erosion resistance of remolded cohesive soils evolves with time, showing the importance of this factor in the design of cohesive erosion experiments. Also, the results show that by accounting for thermal effects on erosion rate, the usability of erosion models can be improved in their use for erosion predictions in soil and water conservation and engineering practice.
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Books on the topic "Cohesive soils"

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Coppola, Luigi. Hydrogeological Instability in Cohesive Soils. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74331-8.

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International Workshop on Constitutive Equations for Granular Non- cohesive Soils (1987 Cleveland, Ohio). Constitutive equations for granular non-cohesive soils: Proceedings of the International Workshop on Constitutive Equations for Granular Non-cohesive Soils, Cleveland, 22-24 July 1987. Rotterdam: A.A. Balkema, 1989.

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Ting, Francis C. K. Evaluation of SRICOS method on cohesive soils in South Dakota. Fargo, N.D.]: Mountain-Plains Consortium, 2010.

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Hedges, Joseph Delbert. The scour of cohesive soils by an inclined submerged water jet. Springfield, Va: Available from the National Technical Information Service, 1990.

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Hung, Ching. Enhanced Anisotropic Bounding Surface Model: Implementation and Simulation of Excavation in Soft Cohesive Soils. [New York, N.Y.?]: [publisher not identified], 2013.

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Krasiński, Adam. Pale przemieszczeniowe wkręcane: Współpraca z niespoistym podłożem gruntowym = Screw displacement piles : interaction with non-cohesive soil. Gdańsk: Wydawnictwo Politechniki Gdańskiej, 2013.

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Nearshore and Estuarine Cohesive Sediment Transport Conference (4th 1994 Wallingford, England). Cohesive sediments: 4th Nearshore and Estuarine Cohesive Sediment Transport Conference, INTERCOH '94, 11-15 July 1994, Wallingford, England, UK. Chichester: John Wiley, 1997.

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Kesteren, Walther G. M. van., ed. Introduction to the physics of cohesive sediment in the marine environment. Amsterdam: Elsevier, 2004.

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DellaCorte, Christopher. Thermal processing effects on the adhesive strength of PS304 high temperature soild lubricant coatings. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Langlois, Geneviève. The case of La Coop de solidarité en soins et services de Saint-Camille (the Saint-Camille Care and Services Solidarity Co-operative) and its impact on social cohesion. Saskatoon, Sask: Centre for the Study of Co-operatives, University of Saskatchewan, 2006.

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Book chapters on the topic "Cohesive soils"

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Gautam, Tej P. "Cohesive Soils." In Selective Neck Dissection for Oral Cancer, 1–2. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-12127-7_60-1.

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Gautam, Tej P. "Cohesive Soils." In Encyclopedia of Earth Sciences Series, 161–62. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_60.

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Nakahara, Tomohiro, Kyohei Ueda, and Susumu Iai. "Modelling of Cohesive Soils: Soil Element Behaviors." In Developments in Earthquake Geotechnics, 317–40. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62069-5_15.

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Coppola, Luigi. "Genesis and Structures of Cohesive Soils." In Hydrogeological Instability in Cohesive Soils, 5–26. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74331-8_1.

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Coppola, Luigi. "Causes of Lanslides in Cohesive Soils." In Hydrogeological Instability in Cohesive Soils, 27–57. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74331-8_2.

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Coppola, Luigi. "The Dating of Landslides." In Hydrogeological Instability in Cohesive Soils, 59–89. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74331-8_3.

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Coppola, Luigi. "The Pre-failure Deformation." In Hydrogeological Instability in Cohesive Soils, 91–135. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74331-8_4.

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Coppola, Luigi. "The Dynamics of Disruptions." In Hydrogeological Instability in Cohesive Soils, 139–89. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74331-8_5.

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Coppola, Luigi. "The Role of the Coefficient of Permeability K." In Hydrogeological Instability in Cohesive Soils, 191–224. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74331-8_6.

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Coppola, Luigi. "Landslides Types and Their Failure Mechanisms." In Hydrogeological Instability in Cohesive Soils, 225–59. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74331-8_7.

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Conference papers on the topic "Cohesive soils"

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Perlea, Vlad G. "Liquefaction of Cohesive Soils." In Geo-Denver 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40520(295)5.

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Alzabeebee, Saif, Younis Alshkane, and Kamal Rashed. "Characteristics of the undrained cohesion of cohesive soils in north of Iraq." In 4th International Conference on Architectural & Civil Engineering Sciences. Cihan University-Erbil, 2023. http://dx.doi.org/10.24086/icace2022/paper.880.

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Robust estimation of the undrained cohesion of fine-grained soils is crucial in the routine design of structures in contact with such soils. However, there is no relationship that could be utilized to estimate the undrained cohesion of cohesive soils in the north of Iraq. This research aims to fill this gap in knowledge. 87 undrained samples were collected and tested in the laboratory and the results were then used to develop predictive models using simple regression analysis and multi-objective evolutionary polynomial regression analysis (EPR-MOGA). It has been found that the undrained cohesion is correlated with reasonable accuracy with water content and dry density of the soil with a coefficient of correlation of 0.82 and 0.77, respectively. Furthermore, poor correlation is found to between the undrained cohesion and liquid limit, plasticity index, and over-consolidation ratio with a coefficient of correlation ranges between 0.30 and 0.36. In addition, it has been noticed that the use of the EPR-MOGA improves the accuracy as it increased R to 0.86. The developed correlations could be used in estimating the undrained cohesion for cases where it is not possible to do the unconfined compressive strength test.
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Briaud, Jean-Louis, H. C. Chen, Francis C. K. Ting, Kiseok Kwak, Seung-Woon Han, Prahoro Nurtjahyo, Yiwen Cao, and Ya Li. "Measuring the Erodibility of Cohesive Soils." In Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40517(2000)266.

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Al-Rubaye, Ahmed, Anton Chirica, and Ioan Bo?i. "THE INFLUENCE OF NANOMATERIALS ON THE GEOTECHNICAL PROPERTIES OF COHESIVE SOILS." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/1.1/s02.019.

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This paper experimentally investigated the effect of using nanomaterials to improve soft soils. Laboratory experimental tests were carried out on loessial soils collected from two different sites in Romania. Two different types of nanomaterials were used in this research, which is namely Nano-MgO with different percentages (0.5%, 0.75%, 1%, and 2%), and Nano-Al2O3 with percentages (0.5%,1%, and 2%), were added to the soil samples, to study their effect on the strength, consistency limits and compressibility of the soil. Treated soil samples were compacted using the modified Proctor test procedure and tested. The results of the investigations showed that the addition of nanomaterials to the soil may help to enhance the geotechnical properties. the compressibility and the strength of the treated soils increase with the increase in the amount of nanomaterials, Also, the addition of nanomaterials to the cohesive soils showed a small effect on the microstructure of the soil samples. As expected, the improvement is dependent on the type and amount of the nanomaterials. The results have been compared with 2% soil mixtures with cement.
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Karim, Md Zahidul, and Stacey E. Kulesza. "Soil Properties Affecting the Onset of Erosion in Cohesive Soils." In Geo-Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482780.073.

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Kung, Johnson H. S., H. D. Lin, Shu-Jung Yang, and Wei-Hsing Huang. "Resilient Modulus and Plastic Strain of Unsaturated Cohesive Subgrade Soils." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)41.

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Onur, Mehmet Inanc. "Investigation of Liquefaction Behaviour for Cohesive Soils." In The 3rd World Congress on Civil, Structural, and Environmental Engineering. Avestia Publishing, 2018. http://dx.doi.org/10.11159/icgre18.134.

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Oh, Seung Jae, Jean-Louis Briaud, Kuang-An Chang, and Hamn-Ching Chen. "Maximum Abutment Scour Depth in Cohesive Soils." In International Conference on Scour and Erosion (ICSE-5) 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41147(392)12.

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Urbaitis, Donatas, Ieva Lekstutytė, and Domas Gribulis. "Overconsolidation Ratio Determination of Cohesive Soil." In The 13th Baltic Sea Region Geotechnical Conference. Vilnius Gediminas Technical University, 2016. http://dx.doi.org/10.3846/13bsgc.2016.014.

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In order to evaluate overconsolidation ratio (OCR) of soil, the necessity to restore them as much as possible to in situ conditions appears, because sometimes when it is not taken into account, mistakes could be made while interpreting mechanical – strength properties of the soil. According to the work purpose, overconsolidation ratio of the investigated soil was set by performing odometer test and the obtained values were compared with the OCR calculated from cone and seismic penetration data. When the tests were performed and data analysed, it was found that OCR values depends on soil occurance depth, strength characteristics and stress conditions. The OCR values decreases with the declination of the depth. As many authors noted in the literature – the upper part of the soil is consolidated abnormally, thereby we can see that in our work. When results are evaluate, we can conclude that all of the analysed soils was overconsolidation. That was demonstrated by calculations according static penetration, oedometer test and seismic waves results. OCR values differences between the laboratory and field tests can show low quality of soil sampling, also due to correlations which was applied.
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Oka, Fusao, Sayuri Kimoto, and Toshihisa Adachi. "Calibration of Elasto-Viscoplastic Models for Cohesive Soils." In Geo-Frontiers Congress 2005. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40771(169)17.

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Reports on the topic "Cohesive soils"

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Kim, Kwangkyum, Monica Prezzi, and Rodrigo Salgado. Interpretation of Cone Penetration tests in Cohesive Soils. West Lafayette, IN: Purdue University, 2006. http://dx.doi.org/10.5703/1288284313387.

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Herrmann, Leonard R., Victor Kaliakin, and C. K. Shen. Improved Numerical Implementation of the Bounding Surface Plasticity Model for Cohesive Soils. Fort Belvoir, VA: Defense Technical Information Center, December 1985. http://dx.doi.org/10.21236/ada163572.

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Shmulevich, Itzhak, Shrini Upadhyaya, Dror Rubinstein, Zvika Asaf, and Jeffrey P. Mitchell. Developing Simulation Tool for the Prediction of Cohesive Behavior Agricultural Materials Using Discrete Element Modeling. United States Department of Agriculture, October 2011. http://dx.doi.org/10.32747/2011.7697108.bard.

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The underlying similarity between soils, grains, fertilizers, concentrated animal feed, pellets, and mixtures is that they are all granular materials used in agriculture. Modeling such materials is a complex process due to the spatial variability of such media, the origin of the material (natural or biological), the nonlinearity of these materials, the contact phenomenon and flow that occur at the interface zone and between these granular materials, as well as the dynamic effect of the interaction process. The lack of a tool for studying such materials has limited the understanding of the phenomena relevant to them, which in turn has led to energy loss and poor quality products. The objective of this study was to develop a reliable prediction simulation tool for cohesive agricultural particle materials using Discrete Element Modeling (DEM). The specific objectives of this study were (1) to develop and verify a 3D cohesionless agricultural soil-tillage tool interaction model that enables the prediction of displacement and flow in the soil media, as well as forces acting on various tillage tools, using the discrete element method; (2) to develop a micro model for the DEM formulation by creating a cohesive contact model based on liquid bridge forces for various agriculture materials; (3) to extend the model to include both plastic and cohesive behavior of various materials, such as grain and soil structures (e.g., compaction level), textures (e.g., clay, loam, several grains), and moisture contents; (4) to develop a method to obtain the parameters for the cohesion contact model to represent specific materials. A DEM model was developed that can represent both plastic and cohesive behavior of soil. Soil cohesive behavior was achieved by considering tensile force between elements. The developed DEM model well represented the effect of wedge shape on soil behavior and reaction force. Laboratory test results showed that wedge penetration resistance in highly compacted soil was two times greater than that in low compacted soil, whereas DEM simulation with parameters obtained from the test of low compacted soil could not simply be extended to that of high compacted soil. The modified model took into account soil failure strength that could be changed with soil compaction. A three dimensional representation composed of normal displacement, shear failure strength and tensile failure strength was proposed to design mechanical properties between elements. The model based on the liquid bridge theory. An inter particle tension force measurement tool was developed and calibrated A comprehensive study of the parameters of the contact model for the DEM taking into account the cohesive/water-bridge was performed on various agricultural grains using this measurement tool. The modified DEM model was compared and validated against the test results. With the newly developed model and procedure for determination of DEM parameters, we could reproduce the high compacted soil behavior and reaction forces both qualitatively and quantitatively for the soil conditions and wedge shapes used in this study. Moreover, the effect of wedge shape on soil behavior and reaction force was well represented with the same parameters. During the research we made use of the commercial PFC3D to analyze soil tillage implements. An investigation was made of three different head drillers. A comparison of three commonly used soil tillage systems was completed, such as moldboard plow, disc plow and chisel plow. It can be concluded that the soil condition after plowing by the specific implement can be predicted by the DEM model. The chisel plow is the most economic tool for increasing soil porosity. The moldboard is the best tool for soil manipulation. It can be concluded that the discrete element simulation can be used as a reliable engineering tool for soil-implement interaction quantitatively and qualitatively.
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Bradford, Joe, Itzhak Shainberg, and Lloyd Norton. Effect of Soil Properties and Water Quality on Concentrated Flow Erosion (Rills, Ephermal Gullies and Pipes). United States Department of Agriculture, November 1996. http://dx.doi.org/10.32747/1996.7613040.bard.

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Concentrated flow erosion in rills, pipes, ephermal gullies, and gullies is a major contributor of downstream sedimentation. When rill or gullies form in a landscape, a 3- to 5-fold increase in soil loss commonly occurs. The balance between the erosive power of the flow and the erosion resistance of the bed material determines the rate of concentrated flow erosion. The resistance of the bed material to detachment depends primarily on the magnitude of the interparticle forces or cohesion holding the particles and aggregates together. The effect of soil properties on bed material resistance and concentrated flow erosion was evaluated both in the laboratory and field. Both rill erodibility and critical hydraulic shear were greater when measured in 9.0 m long rills under field conditions compared with laboratory mini-flumes. A greater hydraulic shear was required to initiate erosion in the field compared to the mini-flume because of the greater aggregate and clod size and stability. Once erosion was initiated, however, the rate of erosion as a function of hydraulic shear was greater under field conditions because of the greater potential for slaking upon wetting and the greater soil surface area exposed to hydraulic shear. Erosion tests under controlled laboratory conditions with the mini-flume allowed individual soil variables to be studied. Attempts to relate rill erosion to a group soil properties had limited success. When individual soil properties were isolated and studied separately or grouped separately, some trends were identified. For example, the effect of organic carbon on rill erodibility was high in kaolinitic soils, low in smectitic soils, and intermediate in the soils dominated by illite. Slow prewetting and aging increased the cohesion forces between soil particles and decreased rill erodibility. Quick prewetting increased aggregate slaking and increased erodibility. The magnitude of the effect of aging depended upon soil type. The effect of clay mineralogy was evaluated on sand/clay mixtures with montmorillonite (M), Illite (I), and kaolinite (K) clays. Montmorillonite/sand mixtures were much less erodible than either illite or kaolonite sand mixtures. Na-I and Na-K sand mixtures were more erodible than Ca-I and Ca-K due to increased strength from ionic bonding and suppression of repulsive charges by Ca. Na-M was less erodiblethan Ca-M due to increased surface resulting from the accessibility of internal surfaces due to Na saturation. Erodibility decreased when salt concentration was high enough to cause flocculation. This occurred between 0.001 mole L-1 and 0.01 mole L-1. Measuring rill erodibility in mini-flumes enables the measurement of cohesive forces between particles and enhances our ability to learn more about cohesive forces resisting soil detachment under concentrated water flow.
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Honegger. L51990 Extended Model for Pipe Soil Interaction. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 2003. http://dx.doi.org/10.55274/r0010152.

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This program contributes to maintaining and improving the integrity and safety of existing pipelines with regard to ground movement hazards, and reducing the capital costs of new pipeline systems. The research program focused on the axial, lateral and complex loading of pipeline due to soil movements. It includes (1) a literature review: it presents significant issues related to modeling pipe-soil interaction with a focus to recent development since ASCE (1984); (2) axial loading: it includes a summary of the methods to estimate the axial soil forces on pipeline and recent field measurements on decommissioned pipe sections in weak to desiccated, cohesive to sandy silts in California; (3) lateral loading of buried pipeline: it covers the effects of cover depth, soil strength, loading rate, trench geometry and backfill strength on pipe-soil interaction; (4) complex loading of buried pipeline: the interaction between the lateral and axial soil forces on pipeline are studied; and (5) quantification of mitigative methods: a physical testing program including a total of 20 laterally loaded pipelines are used to identify and quantify the effects of various mitigative methods on reducing lateral loads transferred to a buried pipeline.
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Ginzberg, Idit, and Walter De Jong. Molecular genetic and anatomical characterization of potato tuber skin appearance. United States Department of Agriculture, September 2008. http://dx.doi.org/10.32747/2008.7587733.bard.

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Potato (Solanum tuberosum L.) skin is composed of suberized phellem cells, the outer component of the tuber periderm. The focus of the proposed research was to apply genomic approaches to identify genes that control tuber skin appearance - smooth and shiny skin is highly preferred by the customers while russeted/netted skin potatoes are rejected. The breeding program (at Cornell University) seeks to develop smooth-skin varieties but has encountered frequent difficulties as inheritance of russeting involves complementary action by independently segregating genes, where a dominant allele at each locus is required for any degree of skin russeting. On the other hand, smooth-skin varieties frequently develop unsightly russeting in response to stress conditions, mainly high soil temperatures. Breeding programs in Israel aimed towards the improvement of heat tolerant varieties include skin quality as one of the desired characteristics. At the initiation of the present project it was unclear whether heat induced russeting and genetically inherited russeting share the same genes and biosynthesis pathways. Nevertheless, it has been suggested that russeting might result from increased periderm thickness, from strong cohesion between peridermal cells that prevents the outer layers from sloughing off, or from altered suberization processes in the skin. Hence, the original objectives were to conduct anatomical study of russet skin development, to isolate skin and russeting specific genes, to map the loci that determine the russet trait, and to compare with map locations the candidate russet specific genes, as well as to identify marker alleles that associated with russet loci. Anatomical studies suggested that russet may evolve from cracking at the outer layers of the skin, probably when skin development doesn’t meet the tuber expansion rate. Twodimensional gel electrophoresis and transcript profiling (cDNA chip, potato functional genomic project) indicated that in comparison to the parenchyma tissue, the skin is enriched with proteins/genes that are involved in the plant's responses to biotic and abiotic stresses and further expand the concept of the skin as a protective tissue containing an array of plantdefense components. The proteomes of skin from heat stressed tubers and native skin didn’t differ significantly, while transcript profiling indicated heat-related increase in three major functional groups: transcription factors, stress response and protein degradation. Exceptional was ACC synthase isogene with 4.6 fold increased level in the heat stressed skin. Russeting was mapped to two loci: rusB on chromosome 4 and rusC on chromosome 11; both required for russeting. No evidence was found for a third locus rusA that was previously proposed to be required for russeting. In an effort to find a link between the russeting character and the heat-induced russeting an attempt was made to map five genes that were found in the microarray experiment to be highly induced in the skin under heat stress in the segregating russet population. Only one gene was polymorphic; however it was localized to chromosome 2, so cannot correspond to rusB or rusC. Evaluation of AFLP markers tightly linked to rusB and rusC showed that these specific alleles are not associated with russeting in unrelated germplasm, and thus are not useful for MAS per se. To develop markers useful in applied breeding, it will be necessary to screen alleles of additional tightly linked loci, as well as to identify additional russet (heat-induced and/or native) related genes.
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