Bibliografias temáticas / Soils

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Literatura científica selecionada sobre o tema "Soils"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 12 de outubro de 2024

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Artigos de revistas sobre o assunto "Soils"

Hamad, Asal Mahmud, e Mahmood Gazey Jassam. "A Comparative Study for the Effect of Some Petroleum Products on the Engineering Properties of Gypseous Soils". Tikrit Journal of Engineering Sciences 29, n.º 3 (15 de outubro de 2022): 69. http://dx.doi.org/10.25130/tjes.29.3.7.

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Gypseous soils are considered problematic soils because the soil cavities happen during receiving the water or this type of soil and solving gypsum materials and contract in a soil volume. In this study, three types of gypseous soils are used; soil1, soil2, and soil3 with gypsum content (28.71%, 43.6%, and 54.88%) respectively, petroleum products (engine oil, fuel oil, and kerosene) are added to the soils with percentages (3%, 6%, 9%, and 12%) for each product. The result showed that specific gravity, liquid limit, optimum moisture content (O.M.C), and maximum dry density decreased with an increased percentage of product for all types of products. The direct shear (dry and soaked case) results show that increasing the (angle of internal friction and the soil cohesion) for soil1, soil2, and soil3 by adding engine oil and fuel oil. Still, when the soils were treated with kerosene, the angle of internal friction increased while cohesion decreased. The collapse potential for the treated soils increases with increasing gypsum content for all petroleum products. The collapse potential (CP) for (soil1) decreased by 47% when using 6% of the engine oil, 48.8% when using 9% of the fuel oil, and 55% when using 9% of the kerosene. The same percentage of the petroleum products (engine oil, fuel oil, and kerosene) decrease the collapse potential for (soil2), (47%, 46%, and 50%) respectively and decrease the collapse potential for (soil 3), (51%, 47.7%, and 52%) respectively. In the unconfined compressive test applied on (soil1) using maximum density, the results show that the soil strength increased (26% and 10%) when using 6% and engine oil and fuel oil, respectively, while the soil strength decreased by 29% when treated with 9% of kerosene.

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Mohamed, Ahmed, Saad Saadi, Ibrahim Gart e Fahmy Mohammed. "Assessing the Improvement of Geotechnical Properties of Clayey Soil Using a Substrate Cement Mortar Material, from Ilgin, Konya City, Turkey". Iraqi Geological Journal 57, n.º 2A (31 de julho de 2024): 162–76. http://dx.doi.org/10.46717/igj.57.2a.12ms-2024-7-22.

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The increase in needs and the decrease in places with good, usable foundation soil have made the construction of engineering structures on problematic soils mandatory. Problematic soils generally do not have sufficient bearing capacity and soil strength, which may create an environment prone to high settlement or liquefaction. To investigate potential ways to enhance the compaction, undesirable or problematic plasticity, and soil’s strength characteristics, various geotechnical tests have been carried out on clayey soils and their mixtures treated with a Substrate Cement Mortar (0, 4, 8, and 12% by weight). These tests involved Atterberg limits, dry density, compaction, and shear strength. The obtained results show that the addition of substrate cement materials increased the dry density of soil treated with SCM, which can significantly enhance the soil properties. Meanwhile, adding SCM decreased the soil's plasticity limits. Furthermore, adding 12% Substrate Cement Mortar resulted in the lowest optimum moisture content and the maximum dry unit weight. Soil treated with 12% also exhibits maximum cohesion and shear strength. This research led to the conclusion that the utilization of Substrate Cement Mortar additive is an inexpensive product and has significantly improved the soil’s geotechnical parameters.

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Pahlevi Munirwan, Reza, e Munirwansyah Munirwansyah. "Assessing slope failure of soil erodibility problem by soil dispersive identification". E3S Web of Conferences 340 (2022): 01006. http://dx.doi.org/10.1051/e3sconf/202234001006.

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Dispersive soils are becoming a common building material. Due to their susceptibility to internal erosion and leakage, dispersive soils should only be used in combination with precise engineering measures to avoid catastrophic failures. Dispersive soils stabilization is critical and has been investigated in several studies conducted throughout the world. Erosion is a significant issue in structures built on sloping contours. As was the case with St. 670+250 Lipat Kajang road in Aceh Singkil. Soil erosion happens as a result of water’s dispersion and transport force. Dispersive soil is one of the factors that contribute to an increase in the soil erodibility index. The objective of this research is to develop a method for enhancing the soil’s dispersive qualities. In this investigation, specimens were prepared in three different soil mix plans (10%, 20%, and 30%) and then tested using a pinhole. The quantity of erodibility that happens in Sta. 670 + 250 Lipat Kajang - Aceh Singkil Regency is based on the results of testing the soil's dispersive properties because the soil in this area is highly dispersive.

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Najafi-Ghiri, M., e A. Abtahi. "Potassium fixation in soil size fractions of arid soils". Soil and Water Research 8, No. 2 (15 de maio de 2013): 49–55. http://dx.doi.org/10.17221/52/2012-swr.

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Amounts of potassium (K) fixed in soil fractions of 10 calcareous soils of southern Iran were measured to evaluate the contributions of different soil size fractions to K fixation. Soil particles were fractionated after dispersion of the soils with an ultrasonic probe. Potassium fixation analysis was done by addition of 1000 mg K/kg samples. Mineralogy of the size fractions was determined by X-ray diffraction. The clay fractions were dominated by smectite, chlorite, mica, and palygorskite. Potassium fixation capacities ranged from 104 to 148 mg/kg for clay, from 102 to 155 mg/kg for silt, and from 96 to 187 mg/kg for sand fractions. A positive and significant relationship (P < 0.05) was obtained between K fixation capacity and smectite content for the clay fractions. High amounts of K fixed in the sand fraction may be explained by a larger diffusion path of fixed K out of the frayed edges of micaceous and smectitic minerals into the extracting solution, low cation exchange capacity (CEC) of the coarse fraction and thereby the high concentration gradient along solution and interlayers, physical entrapment of K ions in coarse aggregates cemented by carbonates, and by the presence of clay particles in coarse fractions due to incomplete dispersion of coarse aggregates.

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Cui, Jifei, Yanhao Jin, Yingjie Jing e Yu Lu. "Elastoplastic Solution of Cylindrical Cavity Expansion in Unsaturated Offshore Island Soil Considering Anisotropy". Journal of Marine Science and Engineering 12, n.º 2 (9 de fevereiro de 2024): 308. http://dx.doi.org/10.3390/jmse12020308.

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An elastoplastic analysis scheme for the cylindrical cavity expansion in offshore islands unsaturated soils considering anisotropy is established. The hydraulic properties and anisotropy caused by stress of unsaturated soils are coupled in an elastoplastic constitutive matrix for unsaturated soil to obtain the governing equations for the cylindrical cavity expansion problem, with an analytical solution that utilizes the original hydro-mechanical state of the soil as the initial conditions. Through a comparative analysis with other analytical solutions, the effectiveness of the new solution is verified. Moreover, the swelling response of the cylindrical cavity expansion in unsaturated soils is examined by systematically analyzing different parameters of the surrounding soil. The findings reveal that the development and rate of anisotropy in normal consolidated soil and over-consolidated soil exert a significant impact on the soil’s mechanical characteristics. Nevertheless, the alteration in the model constant h has little effect on the soil’s mechanical characteristics. The analytical solution introduces anisotropy and broadens the expansion theory of unsaturated soils to yield a more comprehensive theoretical framework for the comprehensive analysis of offshore islands’ unsaturated soils.

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Ngole-Jeme, Veronica M. "Fire-Induced Changes in Soil and Implications on Soil Sorption Capacity and Remediation Methods". Applied Sciences 9, n.º 17 (21 de agosto de 2019): 3447. http://dx.doi.org/10.3390/app9173447.

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Vegetation changes caused by fire events are visible instantly but changes in soils are less apparent, and could be short-term, long-term or permanent in nature. Research has shown that soils undergo changes in their mineralogical, geochemical, physico-chemical and biological properties after a fire event that may vary depending on the intensity and duration of the fire, and the properties of the soil. Some of these properties make significant contributions towards soil’s ability to sorb contaminants. Changes in these properties could affect soil sorption complex and the effectiveness of remediation methods used to clean these soils when contaminated. This review synthesizes available information on fire-induced changes in soil properties affecting soil sorption and the factors which dictate these changes. The implications of changes in these properties on the soil’s natural attenuation capacity and choice of remediation method to clean up fire-affected contaminated soils are also discussed.

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Sturman, V. I., e A. N. Loginovskaya. "BACKGROUND CONCENTRATION OF HEAVY METALS (LEAD, CADMIUM, ZINC, COPPER, NICKEL, ARSENIC, MERCURY) IN SURFACE SOILS OF UDMURTIA CONTROLLED AT ENGINEERING-ECOLOGICAL RESEARCHES". Bulletin of Udmurt University. Series Biology. Earth Sciences 30, n.º 3 (29 de outubro de 2020): 285–94. http://dx.doi.org/10.35634/2412-9518-2020-30-3-285-294.

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Materials of engineering-ecological researches on various economic objects in Udmurtia are processed and systematized. Average (background) concentration of the heavy metals which are subject to obligatory control at engineering-ecological researches (lead, cadmium, zinc, copper, nickel, arsenic, mercury) for the main associations of soils and most wide-distributed kinds of soils are defined. It is revealed that with decreasing the soil’s podzol content and increasing the soil’s clay content, concentrations of heavy metals naturally raise. In general, similar soils are characterized by similar concentrations of heavy metals and similar ratios of concentration. It is established that excesses of hygienic standards on such elements as nickel, arsenic and to a lesser extent zinc, copper and cadmium, are not only something exclusive in Udmurtia, but also spreading more and more widely, especially in soils of light structure. The received average concentration can be accepted as background one at the subsequent engineering-ecological researches in the region.

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Islam, ABMS, ZH Khan e AR Mazumder. "Pedogenesis And Characterization Of Some Soils From The Chalan Beel Of Bangladesh". Journal of the Asiatic Society of Bangladesh, Science 40, n.º 2 (30 de dezembro de 2014): 271–81. http://dx.doi.org/10.3329/jasbs.v40i2.46025.

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Twenty two soil samples from four pedons representing some established soil series namely Jaonia, Haiti, Taras and Digli from the Chalan beel area of Bangladesh were studied in the field as well as in the laboratory for their pedogenesis and characterization. All the soils are heavy textured with clay contents ranging from 47 to 60 percent. The soils are moderately acidic to neutral in reaction with high base saturation. The soils have developed redoximorphic features including redox concentration and redox depletion due to periodic flooding more than 4 months in the monsoon season. Development of cambic horizon in these soils is the most notable morphogenetic feature. Gleization and weak hydromorphism are the dominant pedogenic processes. At the subgroup level the soiis were classified as Typic Endoaquepts and Aerie Endoaquepts. Finally the soiis are characterized at the family level of soil taxonomy. Asiat. Soc. Bangladesh, Sci. 40(2): 271-281, December 2014

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Meier, E. A., P. J. Thorburn e M. E. Probert. "Occurrence and simulation of nitrification in two contrasting sugarcane soils from the Australian wet tropics". Soil Research 44, n.º 1 (2006): 1. http://dx.doi.org/10.1071/sr05004.

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The concentration of ammonium-nitrogen (NH4+-N) frequently exceeds that of nitrate-N (NO3−-N) in Australian wet tropical sugarcane soils. The amount of mineral N in soil is the net result of complex processes in the field, so the objective of this experiment was to investigate nitrification and ammonification in these soils under laboratory conditions. Aerobic and saturated incubations were performed for 1 week on 2 wet tropical soils. Net NO3−-N increased significantly in both soils during both types of incubation. A second series of aerobic incubations of these soils treated with NH4+-N and inoculated with subtropical nitrifying soils was conducted for 48 days. Nitrification in the wet tropical soils was not significantly affected by inoculation, and virtually all added N was nitrified during the incubation period. Mineral N behaviour of the 48-day incubations was captured with the APSIM-SoilN model. As nitrification proceeded under laboratory conditions and was able to be captured by the model, it was concluded that nitrification processes in the wet tropical soils studied were not different from those in the subtropical soils. Processes that remove NO3− from the soil, such as leaching and denitrification, may therefore be important factors affecting the proportions of NH4+-N and NO3−-N measured under field conditions.

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Lai, Yongbiao, Songsong Bai, Jian Hou, Zongqing Zhou, Qiangling Wu, Xiaobo Lv, Liming Yang, Weixun Cao e Zhengtao Ren. "A Synthetic Chart for Internal Stability Assessment of Soils Based on Soil PSD Curves". Processes 10, n.º 5 (20 de abril de 2022): 807. http://dx.doi.org/10.3390/pr10050807.

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Awareness of granulated soils’ internal instability is an important parameter when designing granulated filters, and the ability of a granulated soil’s internal stability can be verified using the soil PSD (Particle Size Distribution) curves’ secant slopes. The current work presents a new method to calculate the soil PSD curves’ secant slopes automatically, and a synthetic diagram is presented for the potential examination of the granulated soils’ internal stability. To verify the feasibility and accuracy of this synthetic diagram, 80 specimens of soil were investigated in this work and categorized into two groups: 50 sand–gravel soils and 30 (clay)–silt–sand–gravel soils. The obtained conclusions indicate that the internal stability and instability potentials of sand–gravel soils can be distinguished successfully with a synthetic chart and the Kenney and Lau criterion but cannot be assessed with the Kezdi and Sherard criteria. None of the criteria studied here can be used for the internal stability assessment of silt–sand–gravel and clay–silt–sand–gravel soils.

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Teses / dissertações sobre o assunto "Soils"

Robert, Dilan Jeyachandran. "Soil-pipeline interaction in unsaturated soils". Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/265508.

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Pipelines that are used for the transport of energy and services are very important lifelines to modem society. Though pipelines are generally buried in unsaturated soils, the design guidelines are based on the assumption that the soil is either dry or fully saturated. For certain geotechnical problems, this assumption may not be acceptable because the water meniscus formed between soil particles creates an additional normal force between them by suction, which in turn forms temporary bonds. A recent series of large-scale physical model experiments at the Pipeline Engineering Research Laboratory (PERL) of Tokyo Gas, Japan show a higher peak load under unsaturated conditions compared to dry conditions. In contrast, recent experiments performed at Cornell University (CU) show that the soil-load due to lateral pipeline movement in dry and unsaturated sands are virtually the same. Thus, the effect of partial saturation on soil loading to pipeline may be different depending on soil type, moisture content and density. The current study investigates this problem through triaxial testing and constitutive modelling of the unsaturated soils used for the experiments and finite element simulations of the experiments. The mechanical behaviour of the sands used in the physical model experiments has been investigated by conducting a series of laboratory experiments. When compacted to the same energy level, Tokyo Gas sand exhibits larger strength in unsaturated conditions than in dry conditions at low confining stress levels mainly due to the suction-induced apparent cohesion generated by the fine particles present in the sand. In contrast, for coarser Cornell sand, the suction effect is found to be small even at low confining stress level, and hence the strength in unsaturated conditions is similar to that in dry ( or fully saturated) conditions. To capture the observed behaviour of dry as well as unsaturated soils, advanced constitutive soil models were developed. For dry (or fully saturated) soils, the modified Mohr-Coulomb and Original Nor-Sand (Cheong, 2006) models were able to simulate the general behaviour including the strain softening effect. To cater for the behaviour of unsaturated soils, the saturated versions of the NorSand and the modified Mohr-Coulomb models were modified in conjunction with the generalised effective stress framework. By simulating the triaxial experimental data, it is demonstrated that the developed models can predict the realistic soil behaviour of unsaturated soils. Using the developed models, the large scale physical model experiments of pipelines subjected to lateral soil movements at PERL and CU were simulated by the explicit finite element method. Good agreement was found between the numerical models and the experiments. Further FE analyses were conducted to investigate the pipeline behaviour under lateral soil movement at conditions of different HID's, moisture contents, and relative densities. The results were synthesized to produce new normalised pipe load charts. Three dimensional finite element analysis was performed to simulate the soil-pipeline interaction under strike-slip fault movements. The finite element model was first validated by comparing the computed results to the data produced from a full scale experiment carried out at CU. The analysis was then further extended by varying the initial conditions of the sand (sand type, density, moisture content, etc.), pipe material, pipe burial depth, and pipeline-fault rupture inclination. It was found in all cases that the peak lateral loads on the pipelines subjected to strike-slip fault movements are less than or equal to the peak loads computed by the 2-D lateral movement simulations.

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Ekanayake, Jagath C. "Soil water movement through swelling soils". Lincoln University, 1990. http://hdl.handle.net/10182/1761.

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The present work is a contribution to description and understanding of the distribution and movement of water in swelling soils. In order to investigate the moisture distribution in swelling soils a detailed knowledge of volume change properties, flow characteristics and total potential of water in the soil is essential. Therefore, a possible volume change mechanism is first described by dividing the swelling soils into four categories and volume change of a swelling soil is measured under different overburden pressures. The measured and calculated (from volume change data) overburden potential components are used to check the validity of the derivation of a load factor, ∝. Moisture diffusivity in swelling soil under different overburden pressures is measured using Gardner's (1956) outflow method. Behaviour of equilibrium moisture profiles in swelling soils is theoretically explained, solving the differential equation by considering the physical variation of individual soil properties with moisture content and overburden pressure. Using the measured volume change data and moisture potentials under various overburden pressures, the behaviour of possible moisture profiles are described at equilibrium and under steady vertical flows in swelling soils. It is shown that high overburden pressures lead to soil water behaviour quite different from any previously reported.

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Stinghen, Geovanne Silva. "Assessment of nitrogen efficiency in maize due to soil compaction and changes in soil physical properties /". free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1422967.

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Njie, Momodou. "Modelling soil moisture dynamics in vegetated soils". Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406159.

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Dash, Suresh R. "Lateral pile soil interaction in liquefiable soils". Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543468.

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Dickey, Juliana Sloan. "The effects of selected nitrogen and sulfur applications on soil pH, water soluble sulfate, DTPA extractable iron, manganese, copper and zinc on selected Arizona soils". Thesis, The University of Arizona, 1985. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1985_190_sip1_w.pdf&type=application/pdf.

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Young, Fred J. "Spatial variability of soil properties within a loess-covered, upland landscape /". free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9823319.

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Barzegar, Abdolrahman. "Structural stability and mechanical strength of salt-affected soils". Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phb296.pdf.

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Copies of author's previously published articles in pocket inside back cover. Bibliography: leaves 147-160. This thesis outlines the factors affecting soil strength and structural stability and their interrelationship in salt-affected soils. The objectives of this study are to investigate the influence of clay particles on soil densification and mellowing, the mellowing of compacted soils and soil aggregates as influenced by solution composition, the disaggregation of soils subjected to different sodicities and salinities and its relationship to soil strength and dispersible clay and the effect of organic matter and clay type on aggregation of salt-affected soils.

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Thakali, Sagar. "Terrestrial biotic ligand model (TBLM) for copper, and nickel toxicities to plants, invertebrates, and microbes in soils". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.00 Mb., 340 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3221133.

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Nelson, Paul Netelenbos. "Organic matter in sodic soils : its nature, decomposition and influence on clay dispersion". Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phn4281.pdf.

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Bibliography: leaves 147-170. Aims to determine the influence of sodicity on the nature and decomposition of organic matter; and the influence of organic matter and its components on the structural stability of sodic soils.

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Mais fontes

Livros sobre o assunto "Soils"

Natural History Museum (London, England), ed. Soils. London: The Natural History Museum, 2001.

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Bridges, E. M. World soils. 2^a ed. Cambridge: Cambridge University Press, 1990.

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Troeh, Frederick R. Soils and soil fertility. 5^a ed. New York: Oxford University Press, 1993.

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M, Thompson Louis, ed. Soils and soil fertility. 6^a ed. Ames, Iowa: Blackwell Pub., 2005.

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A, McKeague J., Canada. Agriculture Canada. Research Branch. e Land Resource Research Institute (Canada), eds. Concepts and classification of Gleysolic soils in Canada. Ottawa: Agriculture Canada, Research Branch, 1986.

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Paul, Bowles John, Pesch Barbara B e Brooklyn Botanic Garden, eds. Soils. Brooklyn, N.Y: Brooklyn Botanic Garden, 1986.

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Fredlund, D. G., e H. Rahardjo. Soil Mechanics for Unsaturated Soils. Hoboken, NJ, USA: John Wiley & Sons, Inc., 1993. http://dx.doi.org/10.1002/9780470172759.

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E, Alley Darrell, Forestry Sciences Laboratory (Columbia, Mo.) e United States Forest Service, eds. Soil sampler for rocky soils. [Columbia, Mo.?]: U.S. Dept. of Agriculture, Forest Service, North Carolina Forest Experiment Station, 1997.

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H, Rahardjo, ed. Soil mechanics for unsaturated soils. New York: Wiley, 1993.

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Stathers, Robert John. Forest soil temperature manual. [Victoria, B.C.]: Canada/BC Economic & Regional Development Agreement, 1990.

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Capítulos de livros sobre o assunto "Soils"

Castilho, Pierre del, e Rainer Breder. "Soils and Soil Solutions". In Sampling and Sample Preparation, 43–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60632-8_5.

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Tedrow, J. C. F., e F. C. Ugolini. "Antarctic Soils". In Antarctic Soils and Soil Forming Processes, 161–77. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/ar008p0161.

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Bridget Gleeson, Deirdre. "Soil Biological Processes in Urban Soils". In Urban Soils, 243–91. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87316-5_8.

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Osman, Khan Towhid. "Concepts of Soil". In Soils, 1–7. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5663-2_1.

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Osman, Khan Towhid. "Plant Nutrients and Soil Fertility Management". In Soils, 129–59. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5663-2_10.

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Osman, Khan Towhid. "Problem Soils and Their Management". In Soils, 161–74. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5663-2_11.

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Osman, Khan Towhid. "Soil Resources and Soil Degradation". In Soils, 175–213. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5663-2_12.

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Osman, Khan Towhid. "Wetland Soils". In Soils, 215–27. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5663-2_13.

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Osman, Khan Towhid. "Forest Soils". In Soils, 229–51. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5663-2_14.

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Osman, Khan Towhid. "Climate Change and Soil". In Soils, 253–61. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5663-2_15.

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Trabalhos de conferências sobre o assunto "Soils"

Kaminski, Pauline, Jürgen Grabe e Zeest Fatima. "Miniaturised Testing Device for the Qualitative Analysis of Gas Exsolution in Soil". In ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-101605.

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Abstract The presence of gas is a widespread phenomenon in marine and coastal soils, often accompanied by complications in engineering application. The characteristics of the gas phase in the pore space are relevant for the assessment of the soil mechanical implications. In granular soils the formation of capillary bridges between the soil particles can invoke cohesive forces. In fine-grained soils gas-induced fractures may weaken the soil structure. Additionally, an excessive gas production leads to a build-up of pore pressures and can thereby trigger a liquefaction failure in granular soils. To enable a differentiated investigation of these features, however, it is vital to look into the inner pore space of a gassy soil. For this purpose, a miniaturised experimental set-up was developed which allows for the documentation of gas bubble nucleation and growth in a soil’s pore space by means of the imaging technique X-ray computed tomography. Herein, gassy soil samples with a stationary grain structure are obtained by means of the axis-translation technique. The degree of saturation is adjusted by a controlled pressure relief. During image processing the three phases — soil particles, pore water and gas — are identified and thus, their interaction can be studied. The microscopic insights gained with the help of this experimental set-up will allow validation or falsification of the basic theoretical assumptions on gassy soils. Furthermore, the data bears great potential for the advancement of approaches for multiphase simulation.

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Okolelova, Alla, e Galina Egorova. "THE FACTORS INCREASING THE OBJECTIVE ASSESSMENT OF OIL PRODUCTS IN SOIL". In Land Degradation and Desertification: Problems of Sustainable Land Management and Adaptation. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1716.978-5-317-06490-7/235-240.

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Natural objective reasons significantly complicate the objective assessment of oil products in soils: a variety of chemical forms of the pollutants connection, the soil ability to self-healing and self-cleaning, provincial features of the soil cover, lack of objective criteria.To increase the objectivity of determining the presence of oil products in soils, it is proposed to take into account the following factors: analysis methods of soils contaminated with oil products, the chemical properties of extractants extracting oil products from soil samples, the content of soil organic carbon and nonspecific organic compounds in conditionally unpolluted and oil-polluted soils, an increase in organic carbon in soils contaminated with petroleum products, units of measurement (% or mg / kg), the soil horizonin which soil samples were taken, the presence of discrepancies in GOST standards on the standardization of pollutants of organic origin in soils, the state of modern rationing of oil and oil products in soils and the terminological aspect.

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Pospisilova, Lubica. "APPLICATION OF SOIL CONDITIONERS IN SANDY SOILS". In 15th International Multidisciplinary Scientific GeoConference SGEM2015. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2015/b32/s13.005.

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Andromalos, Kenneth B., Yasser A. Hegazy e Brian H. Jasperse. "Stabilization of Soft Soils by Soil Mixing". In Soft Ground Technology Conference. Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40552(301)16.

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Zou, L., e E. C. Leong. "Soils with Bimodal Soil-Water Characteristic Curve". In Second Pan-American Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481684.006.

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Bean, E. Z., e M. D. Dukes. "Soil Amendments for Mitigation of Compacted Soils". In Low Impact Development International Conference (LID) 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41099(367)66.

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Drnevich, Vincent P., Carlos E. Zambrano, Sochan Jung e Julia P. Clarke. "Electrical Conductivity of Soils and Soil Properties". In GeoCongress 2008. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40972(311)40.

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Subhasinghe, R. M. K. R., e L. I. N. De Silva. "Point of fixity of laterally loaded piles on layered soils". In Civil Engineering Research Symposium 2024, 17–18. Department of Civil Engineering, University of Moratuwa, 2024. http://dx.doi.org/10.31705/cers.2024.9.

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Piles are critical structural elements that often face lateral loads from various sources, including moving vehicles on bridges, wind, waves, slope movement, and seismic activities. These lateral loads can cause substantial bending moments and lateral deflections in piles, which can compromise the structural integrity of the foundation. The point of fixity is a widely used concept in the design of laterally loaded piles, providing the necessary rigidity to withstand these forces and minimize deflections. While several analytical methods have been developed to determine the point of fixity in single-layered soils, their effectiveness and applicability in multilayered soils remain less certain. This study investigates the validity of two commonly used analytical methods, Broms method and Kocsis method for determining the point of fixity in multilayered soils. The depth of fixity was estimated using average soil properties and compared against results obtained from more advanced approaches, including finite element modelling and p-y curve analysis, which consider distinct properties of individual soil layers. A comprehensive parametric study was also conducted to examine the influence of various factors, such as soil type, soil layer thickness, pile diameter, magnitude of lateral and axial loads, and pile embedment length, on the point of fixity. The comparison revealed significant differences between the analytical methods, particularly in the context of predominantly cohesive soils. The Broms and Kocsis methods estimated the depth of fixity to be between 1.0 and 2.0 times the pile diameter below the ground surface, while the p-y curve and FEA methods yielded slightly more conservative values, ranging from 1.0 to 1.5 times the pile diameter. In predominantly cohesionless soils, the estimated fixity depths were more consistent across all methods, varying between 1.0 and 1.5 times the pile diameter below the ground surface. These findings highlight potential limitations in the applicability of traditional analytical methods to multilayered soils and underscore the importance of refining these approaches for more accurate and reliable design. The parametric study further revealed that for long (flexible) piles, the depth of fixity is generally not significantly affected by factors such as surrounding soil type, layer thickness, axial load, and pile length. However, pile diameter and lateral load were found to have a substantial impact on the depth of fixity, with the effects varying depending on the analytical method employed and the soil's cohesive or cohesionless nature. Interestingly, the study also found that, even in single-layered soils, the Broms and Kocsis methods could yield results that significantly deviate from those obtained via p-y curve analysis. This discrepancy underscores the necessity for further detailed studies, including experimental work with instrumented pile tests, to enhance the accuracy and reliability of these methods. Overall, the study suggests that the point of fixity in predominantly cohesive soils ranges from 0.5 to 2.5 times the pile diameter below the ground surface, whereas in predominantly cohesionless soils, it ranges from 0.5 to 2.0 times the pile diameter.

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Volokitin, Mitrofan. "PHYSICAL DEGRADATION OF SOILS DURING THEIR USE". In Land Degradation and Desertification: Problems of Sustainable Land Management and Adaptation. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1712.978-5-317-06490-7/218-222.

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The issues related to the degradation of agrophysical parameters of soils are considered. The studies were carried out on gray forest soils of the northern forest-steppe. The assessment of the degree of degradation of the water resistance of the macrostructure of soils during their agricultural use has been carried out. The relationship between the bulk density and the lowest moisture capacity, inter-aggregate cohesion and the filtration coefficient of gray forest soil has been established. Soil losses during thawed runoff were estimated.

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Bilici, C., P. Carotenuto, T. Lunne, A. H. Augustesen, L. Krogh, H. Dias, M. C. Sougle et al. "Offshore Geotechnical Site Characterization of Silty Soils: a Novel Database". In Innovative Geotechnologies for Energy Transition. Society for Underwater Technology, 2023. http://dx.doi.org/10.3723/xegy3943.

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Current practice in the offshore wind industry is to utilise existing CPTU soil behavior charts to identify soil type (e.g., clean sands to silty sands, sand mixtures, clay etc.). The charts identify drained clean sands and undrained clays; however there are limitations detecting silty soils. Accordingly, indication of soil behaviour is needed to define whether the engineering correlations for drained or undrained soils should be used for partial drained silty soils. This paper presents a high-quality database of CPTU and laboratory index data collected as part of a Joint Industry Project on characterisation of silty soils. The database consists of results from 23 sites (21 offshore and two onshore sites) covering a wide range of silts from silty sands to clayey silts and silt mixtures. The database is used to test existing soil behavior charts. The study provides guidelines for industry practice for geotechnical site characterization of silty soils.

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Relatórios de organizações sobre o assunto "Soils"

Ponder, Felix Jr, e Darrell E. Alley. Soil sampler for rocky soils. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station, 1997. http://dx.doi.org/10.2737/nc-rn-371.

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Gombert, D. II. Evaluation of soil washing for radiologically contaminated soils. Office of Scientific and Technical Information (OSTI), março de 1994. http://dx.doi.org/10.2172/10163686.

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Cunnane, J. C., V. R. Gill, S. Y. Lee, D. E. Morris, M. D. Nickelson, D. L. Perry e V. C. Tidwell. Uranium soils integrated demonstration: Soil characterization project report. Office of Scientific and Technical Information (OSTI), agosto de 1993. http://dx.doi.org/10.2172/10180428.

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Fenton, Thomas, e Gerald Miller. Iowa Soils. Ames: Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1378.

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Fenton, Thomas, e Gerald Miller. Iowa Soils. Ames: Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1382.

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Fenton, Thomas, e Gerald Miller. Iowa Soils. Ames: Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1387.

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Fenton, Thomas, e Gerald Miller. Iowa Soils. Ames: Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1398.

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Fenton, Thomas, e Gerald Miller. Iowa Soils. Ames: Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1404.

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Fenton, Thomas, e Gerald Miller. Iowa Soils. Ames: Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1424.

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Fenton, Thomas, e Gerald Miller. Iowa Soils. Ames: Iowa State University, Digital Repository, 2016. http://dx.doi.org/10.31274/farmprogressreports-180814-1442.

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