Bibliografie tematiche / Soil Stress

Letteratura scientifica selezionata sul tema "Soil Stress"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Soil Stress"

1

Várallyay, Gy. "Soil-water stress". Cereal Research Communications 37, n. 2 (giugno 2009): 315–19. http://dx.doi.org/10.1556/crc.37.2009.suppl.7.

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2

Keller, T., J. Arvidsson, J. B. Dawidowski e A. J. Koolen. "Soil precompression stress". Soil and Tillage Research 77, n. 1 (maggio 2004): 97–108. http://dx.doi.org/10.1016/j.still.2003.11.003.

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3

Arvidsson, J., e T. Keller. "Soil precompression stress". Soil and Tillage Research 77, n. 1 (maggio 2004): 85–95. http://dx.doi.org/10.1016/j.still.2004.01.003.

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4

Xu, Bin Bin. "Influence of Soil Structure on the Mechanical Response of Soft Soil". E3S Web of Conferences 38 (2018): 03027. http://dx.doi.org/10.1051/e3sconf/20183803027.

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Abstract (sommario):
Usually the natural sedimentary soils possess structure more or less, which makes their mechanical response much different from the fully remolded soils. In this paper, the influence of soil structure on the mechanical response such as compressibility, shear, permeability is literately reviewed. It is found that the compressibility and consolidation behavior of structured and remolded soils can be divided clearly before or after the structural yield stress. The stress-strain relationship can be divided into two segments before and after the structural yield stress. Before the yield stress, the curve is elevating and after the yield stress the curve is decreasing. The increasing rate of pore water pressure increases after the soil reached yield stress.
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5

Richards, BG. "The role of lateral stresses on soil water relations in swelling clays". Soil Research 24, n. 4 (1986): 457. http://dx.doi.org/10.1071/sr9860457.

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Abstract (sommario):
The moisture characteristic of a swelling soil is the result of complex interaction between the soil water potential and imposed mechanical stresses. This can give rise to soil water profiles which cannot be interpreted by soil water theories for non-swelling soils. Agricultural soil physics has been concerned primarily with highly structured surface soils, and has developed simple theories for the effects of stress on soil water relations in swelling soils. These simple theories ignore the effect of lateral stress in the soil. Civil engineers, on the other hand, dealing mainly with less complex soils at depth, have developed more complex theories for the effect of three-dimensional stress states on soil water relations. This paper shows how the effect of three-dimensional stress can and should be included in soil water studies of swelling soils, and gives examples to demonstrate the possible magnitude of such effects.
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6

Shevchenko, A. V., I. G. Budzanivska, T. P. Shevchenko e V. P. Polischuk. "Stress caused by plant virus infection in presence of heavy metals". Plant Protection Science 38, SI 2 - 6th Conf EFPP 2002 (31 dicembre 2017): 455–57. http://dx.doi.org/10.17221/10522-pps.

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Due to increased heavy metal content in Ukrainian soils, purpose of the work was to study relations between presence of heavy metals in soil and their effect on development of phytoviral infection. Experiments were conducted in Nicotiana tabacum – Potato virus X model system. Soluble salts of Cu, Zn and Pb were deposited in soil separately at the limiting concentrations simultaneously with virus infection of plants. Infected plants grown on usual soil showed symptoms of disease on 16 dpi as well as plants grown on soil with metals deposited. Contrary, combined effect of heavy metals and virus infection caused an increase of chlorophyll content comparing with control plants, therefore effect of heavy metals partially compensated the effect of virus infection on experimental plants.
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7

Gao, Xiaojing, Qiusheng Wang, Chongbang Xu e Ruilin Su. "Experimental Study on Critical Shear Stress of Cohesive Soils and Soil Mixtures". Transactions of the ASABE 64, n. 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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8

Wang, Dong Lin. "Experimental Study on Soil Water Characteristic Curve of Compacted Unsaturated Soil". Advanced Materials Research 168-170 (dicembre 2010): 1285–88. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1285.

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Abstract (sommario):
Soil water characteristic curve is one of important topics of unsaturated soils. Pressure plate extractor and GDS unsaturated triaxial apparatus are used to study influencing factors including types of soils and net mean stress. Through method of least-squares, Fredlund five-parameter model were employed to fit soil-water characteristic curves. The results show that model provided a satisfactory fit to the experimental data. Through an analysis of influencing factors, we find that not only physical condition of samples but also external stress condition can affect the shape of soil water characteristic curve.
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9

Lukács, A., G. Pártay, T. Németh, S. Csorba e C. Farkas. "Drought stress tolerance of two wheat genotypes". Soil and Water Research 3, Special Issue No. 1 (30 giugno 2008): S95—S104. http://dx.doi.org/10.17221/10/2008-swr.

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Abstract (sommario):
Biotic and abiotic stress effects can limit the productivity of plants to great extent. In Hungary, drought is one of the most important constrains of biomass production, even at the present climatic conditions. The climate change scenarios, developed for the Carpathian basin for the nearest future predict further decrease in surface water resources. Consequently, it is essential to develop drought stress tolerant wheat genotypes to ensure sustainable and productive wheat production under changed climate conditions. The aim of the present study was to compare the stress tolerance of two winter wheat genotypes at two different scales. Soil water regime and development of plants, grown in a pot experiment and in large undisturbed soil columns were evaluated. The pot experiments were carried out in a climatic room in three replicates. GK Élet wheat genotype was planted in six, and Mv Emese in other six pots. Two pots were left without plant for evaporation studies. Based on the mass of the soil columns without plant the evaporation from the bare soil surface was calculated in order to distinguish the evaporation and the transpiration with appropriate precision. A complex stress diagnosis system was developed to monitor the water balance elements. ECH<sub>2</sub>O type capacitive soil moisture probes were installed in each of the pots to perform soil water content measurements four times a day. The irrigation demand was determined according to the hydrolimits, derived from soil hydrophysical properties. In case of both genotypes three plants were provided with the optimum water supply, while the other three ones were drought-stressed. In the undisturbed soil columns, the same wheat genotypes were sawn in one replicate. Similar watering strategy was applied. TDR soil moisture probes were installed in the soil at various depths to monitor changes in soil water content. In order to study the drought stress reaction of the wheat plants, microsensors of 1.6 mm diameter were implanted into the stems and connected to a quadrupole mass spectrometer for gas analysis. The stress status was indicated in the plants grown on partly non-irrigated soil columns by the lower CO<sub>2</sub> level at both genotypes. It was concluded that the developed stress diagnosis system could be used for soil water balance elements calculations. This enables more precise estimation of plant water consumption in order to evaluate the drought sensitivity of different wheat genotypes.
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10

Oh, Seboong, Ki Hun Park, Oh Kyun Kwon, Woo Jung Chung e Kyung Joon Shin. "On the Hypothesis of Effective Stress in Consolidation and Strength for Unsaturated Soils". Applied Mechanics and Materials 256-259 (dicembre 2012): 108–11. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.108.

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Abstract (sommario):
The hypothesis on effective stress of unsaturated soils is validated by consolidation strength results of triaxial tests for the compacted residual soil. The effective stress can describe the unsaturated soil behavior, which was defined from shear strength or from soil water characteristic curves. Since the effective stress from consolidation agrees with that from the shear strength, the effective stress from soil water retention curve could describe the unsaturated behavior consistently on both consolidation path and stress at failure. The effective stress can describe the entire unsaturated behavior from consolidation to failure.
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Tesi sul tema "Soil Stress"

1

Parathiras, Vasilis. "Stress-density relationships for an agricultural soil". Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/40978.

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Triaxial tests under high loading rates and different confining pressures simulate the multi-pass effect of a tractor wheel loading on the soil. A volume measuring technique was developed to be used in triaxial tests conducted under high loading rates.

A sandy clay agricultural soil was tested under predetermined conditions using an INSTRON loading frame, a differential pressure transducer and an APPLE Il + microcomputer. A preliminary analysis indicated that the measuring technique that was developed, was capable of recording volume changes under high loading rates. Stress-density plots were created using the obtained data and a mathematical model was developed relating stress to density. Stress-strain data was used to evaluate the soil parameters under the Mohr-Coulomb failure criteria. Furthermore, the influence of the initial soil density on the soil behavior was evaluated and subsequently compared to the results of a similar study conducted under a different initial density.


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2

Bones, Emma Jean. "Predicting critical shear stress and soil erodibility classes using soil properties". Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52198.

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As scouring around foundations is the most common cause of bridge failures, one of the most pressing questions of this research is to determine whether or not it is possible to predict the critical shear stress of different soil types using only soil property information. This report shows that it is possible to predict critical shear stress and determines the soil properties that are required to predict the critical shear stress based on soils from Georgia. Multiple methods to predict soil erodibility categories are developed based on the amount of soil information available to the researcher. The report shows how the methods to predict soil erodibility can be integrated with HYRISK, a scour risk assessment tool. In particular, the probabilities of bridge failures and expected economic losses are calculated for approximately 40 bridges in Georgia; soil erodibility characteristics for these bridges are calculated using the methods developed in this thesis. The goal of this thesis is to provide a faster and more cost-effective approach to calculate critical shear stress ranges likely to be encountered at a bridge foundation. Implementation of theses methodologies will help balance funding for new and existing bridges while simultaneously ensuring safe bridge foundation and minimizing economic consequences associated with overbuilding a bridge and/or having to retrofit or replace a bridge that has scour damage due to underbuilding it to withstand a major storm event.
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3

Du, Plessis Keith R. (Keith Roland). "Biological indicators of copper-induced stress in soil". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52719.

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Thesis (MSc)--University of Stellenbosch, 2002.
ENGLISH ABSTRACT: The concentrations of copper (Cu) in vineyard soils of the Western Cape range from 0.1 to 20 ppm. However, more than 160 tons of the fungicide copper oxychloride are annually being sprayed on these vineyards. This has raised concerns that Cu may accumulate in these soils, resulting in a negative impact on the soil biological processes, especially since the soils in the Western Cape are slightly acidic, making Cu more mobile and available for soil organisms than would have been the case in alkaline soils. The goal of the initial part of this study was therefore to identify those soil microbial communities indigenous to the Western Cape, which are most susceptible to Cu-induced stress as a result of the addition of copper oxychloride. These potential bioindicators of Cu-induced stress were first searched for in uncultivated agricultural soil from Nietvoorbij experimental farm. Consequently, a series of soil microcosms was prepared by adding various concentrations of Cu as a component of copper oxychloride, to each of eight aliquots of soil: 0 (control), 10, 20, 30, 40, 50, 100, 500 and 1000 ppm. The resulting concentrations of exchangeable Cu in these microcosms were found to be 2 (control), 12,23,34,42,59, 126,516 and 1112 ppm. Selected microbial communities in each microcosm were subsequently monitored over a period of 245 days. It was found that the culturable microbial numbers did not provide a reliable indication of the effect of Cu on community integrity. However, analyses of terminal-restriction fragment length polymorphism (T-RFLP) community fingerprints and especially analyses of the whole community metabolic profiles, revealed that shifts in the soil microbial communities took place as the Cu concentration increased. Direct counts of soil protozoa also revealed that the addition of Cu to the soil impacted negatively on the numbers of these eukaryotes. To confirm these findings in other soil ecosystems, the impact of copper oxychloride on whole community metabolic profiles and protozoan numbers were investigated in soils from Koopmanskloof commercial farm and Nietvoorbij experimental farm. These potential bioindicators were subsequently monitored in a series of soil microcosms prepared for each soil type by adding the estimated amounts of 0 (control), 30, 100 and 1000 ppm Cu as a component of copper oxychloride to the soil. The results confirmed the fmdings that elevated levels of copper impact negatively on the metabolic potential and protozoan numbers of soil. Consequently, it was decided to investigate a combination of protozoan counts and metabolic profiling as a potential bioindicator for Cu-induced stress in soil. Data collected from all the microcosms containing exchangeable Cu concentrations ranging from 1 ppm to 1112 ppm was used to construct a dendrogram using carbon source utilization profiles in combination with protozoan counts. It was found that the microcosms grouped into clusters, which correlated with the concentration of exchangeable Cu in the soil. Under the experimental conditions used in this study, the combination of protozoan counts and metabolic profiling seemed to be a reliable indicator of Cu-induced stress. However, this bioindicator must be further investigated in other soil types using other types of stress inducing pollutants. In addition to the above fmdings it was also found that the numbers of soil protozoa was particularly susceptible to Cu-induced stress in soils with a low soil pH. This is in agreement with the fmdings of others on the bio-availability of heavy metals in low pH soils. In these soils, nutrient cycling as a result of protozoan activity, may therefore be particularly susceptible to the negative impact of copper to the soil.
AFRIKAANSE OPSOMMING: Die konsentrasies van koper (Cu) in wingerdgronde van die Wes-Kaap wissel tussen 0.1 en 20 dpm. Meer as 160 ton van die fungisied koper-oksichloried word egter jaarliks op dié wingerde gespuit, wat kommer laat ontstaan het oor die moontlike akkumulasie van Cu in dié grond en die gevaar van 'n negatiewe impak op die biologiese prosesse in die grond. Die gevaar word vererger deur die feit dat die Wes-Kaapse grond effens suur is, wat Cu meer mobiel en beskikbaar maak vir grondorganismes as wat die geval sou wees in alkaliese grond. Die eerste doelstelling van hierdie studie was dus om die mikrobiese gemeenskappe in die grond, wat inheems is aan die Wes-Kaap, te identifiseer wat die meeste vatbaar is vir Cu-geïnduseerde stres as gevolg van die toevoeging van koper-oksichloried. Hierdie potensiële bioindikatore van Cu-geïnduseerde stres is eerstens gesoek in onbewerkte landbougrond van die Nietvoorbij-proefplaas. 'n Reeks grondmikrokosmosse is gevolglik berei deur verskillende konsentrasies Cu, as 'n komponent van koperoksichloried, by elk van agt hoeveelhede grond te voeg naamlik 0 (kontrole), 10,20, 30, 40, 50, 100, 500 en 1000 dpm. Die gevolglike konsentrasies van uitruilbare Cu in hierdie mikrokosmosse was 2 (kontrole), 12, 23, 34, 42, 59, 126, 516 en 1112 dpm. Geselekteerde mikrobiese gemeenskappe in elke mikrokosmos is vervolgens oor 'n tydperk van 245 dae bestudeer. Daar is gevind dat die kweekbare mikrobiese tellings nie 'n betroubare aanduiding kon gee van die uitwerking van Cu op gemeenskapsintegriteit nie. Die ontledings van terminale-restriksie fragment lengte polymorfisme (T-RFLP) gemeenskapsvingerafdrukke en veral van die metaboliese profiele van die totale gemeenskap, het getoon dat verskuiwings in die grondmikrobiese gemeenskappe plaasgevind het met 'n toename in Cu-konsentrasies. Direkte tellings van grondprotosoë het ook aangedui dat die toevoeging van Cu tot die grond 'n negatiewe uitwerking op die getalle van hierdie eukariote gehad het. Om dié resultate te bevestig, is die impak van koper-oksichloried op die metaboliese profiele van totale gemeenskappe en protosoë-getalle in ander grond-ekosisteme vervolgens bestudeer deur grond van die kommersiële plaas Koopmanskloof en die Nietvoorbij-proefplaas te gebruik. Dié potensiële bioindikatore is vervolgens bestudeer in 'n reeks grondmikrokosmosse, wat vir elke grondtipe voorberei is deur die toevoeging van beraamde hoeveelhede van 0 (kontrole), 30, 100 en 1000 dpm Cu as 'n komponent van koper-oksichloried. Die resultate het die bevindings bevestig dat verhoogde vlakke van Cu 'n negatiewe uitwerking het op die metaboliese potensiaal en op die protosoëgetalle in die grond. Daar is gevolglik besluit om 'n kombinasie van protosoë-tellings en metaboliese profiele te ondersoek as 'n potensiële bioindikator van Cu-geïnduseerde stres in grond. Data van al die mikrokosmosse wat uitruilbare Cu bevat, wisselend van 1 dpm tot 1112 dpm, is gebruik om 'n dendrogram te konstrueer wat koolstofbronbenuttingsprofiele in kombinasie met protosoë tellings gebruik. Daar is gevind dat die mikrokosmosse groepe vorm wat korrelleer met die konsentrasie uitruilbare Cu in die grond. Onder die eksperimentele kondisies wat in dié studie gebruik is, wil dit voorkom of die kombinasie van protosoë-tellings en metaboliese profiele 'n betroubare indikator van Cugeïnduseerde stres is. Hierdie bioindikator moet egter verder in ander grondtipes en met ander tipes stres-induserende besoedeling ondersoek word. By bogenoemde bevindings is daar ook gevind dat die getalle grondprotosoë besonder gevoelig is vir Cu-geïnduseerde stres in grond met In lae pH. Dit is in ooreenstemming met die bevindings van andere met betrekking tot die bio-beskikbaarheid van swaar metale in grond met 'n lae pH. In dié tipe grond mag nutriëntsiklering as gevolg van protosoë aktiwiteit besonder gevoelig wees vir die negatiewe uitwerking van koper in die grond.
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4

Keller, Thomas. "Soil compaction and soil tillage - studies in agricultural soil mechanics /". Uppsala : Dept. of Soil Sciences, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a489.pdf.

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5

Ching, Peter. "Creep in sands a study of time dependent deformation of reclamation sand fill under constant effective stress /". Click to view the E-thesis via HKUTO, 2001. http://sunzi.lib.hku.hk/hkuto/record/B43894598.

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6

Gavel-Solberg, Vegard. "Development and Implementation of Effective Stress Soil Models". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bygg, anlegg og transport, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26552.

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Abstract (sommario):
Soil exhibit complex behavior that require advanced models to recreate stiffness and strength during loading. The complex behavior may be due to preconsolidation, dilation and contraction, softening, anisotropy, stress dependency or other effects.Today, an effective stress based soil model for soft Scandinavian clays is being developed at NTNU, as part of the ongoing research project GeoFuture. The goal of this thesis is to implement and develop an effective stress based soil model, applying the concept of modular programming used in the GeoFuture project.The soil model was implemented using Fortran and MATLAB code for application in PLAXIS. Modular programming was used to separate the implemented code into two material independent codes and one material dependent code. For development of the model, only the material dependent code needs to be modified.A simple linear elastic-perfect plastic Drucker--Prager model was implemented at first. Simulations in PLAXIS were performed, using the implemented model and the Mohr--Coulomb model in PLAXIS to compare the behavior. For simulation of triaxial compression and extension tests, the models gave the same behavior. In plane strain conditions, the implemented model gave a softer response close to failure. The same strength is obtained for the two models, yet greater deformations arise before failure in the Drucker--Prager model.Applying the advantage of modular programming, the model was further developed to include strain hardening and stress dependent dilatancy. Two formulations of stress dependent dilatancy were used to reproduce behavior of sand in undrained conditions. Simulations of undrained triaxial tests using the model were performed, showing that only one formulation gave the intended behavior.The stress dependent dilatancy was finally related to a critical void ratio for a critical state. Using both constant and mean stress dependent elastic stiffnesses, undrained triaxial compression tests on Toyoura sand were simulated. Simulations gave a good fit between the test results and the simulations. The mean stress dependent stiffness gave superior simulations compared to the constant stiffness.During the development of the model, continuous testing has been executed. The concept of modular programming has shown to perform well. After establishing the first framework with material dependent and independent routines, including new features, or even changing constitutive model, is a manageable and convenient task. The concept yields a good tool for implementing and developing constitutive models of soils.As the strength of the implemented model must be correlated manually to the relevant stress state, further development of the model should include a Lode angle dependency of the strength. Mobilization dependent dilatancy is not included and would improve the performance. A more complete evaluation of material properties from laboratory tests with subsequent simulations would be of great interest to indicate the predictive capacity of the model.
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Fernandez, Americo Leon. "Tomographic imaging the state of stress". Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20698.

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Ho, Mei Yung. "Governing parameters for stress-dependent soil-water characteristics, conjunctive flow and slope stability /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20HO.

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Hoyos, Laureano R. Jr. "Experimental and computational modeling of unsaturated soil behavior under true triaxial stress states". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/32773.

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Mun, Byoung-Jae. "Unsaturated soil behavior under monotonic and cyclic stress states". Texas A&M University, 2004. http://hdl.handle.net/1969.1/1361.

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The objectives of this dissertation are to measure and calculate surface free energies of soil particles, to understand the mechanical behavior of unsaturated silty sand through first studying the stress-strain relationship, the effects of matric suction and pore water chemistry and second to interpret the behavior by the critical state frame work, to develop a method to predict cone tip resistance in unsaturated soils, and to present the concept of pseudo strain and dissipated pseudo strain energy. Universal Sorption Device (USD) is developed to measure surface free energies of soil particles. The test results on a soil sample shows that specific surface area increased with decreasing particle size. The components of surface free energies and the work of adhesion increased with decreasing particle size. A servo controlled triaxial testing device is developed to test 15.24 cm in height and 7.62 cm in diameter, recompacted specimens of unsaturated soil under varying matric suction and different pore chemistry. During the test, the matric suction is maintained constant. Results from the triaxial drained tests are used for validation of the constitutive models proposed by Alonso et al. (1990). Predictions from the model are in good agreement with experimental results. The critical state model for unsaturated soil is used to calculate cone tip resistance in unsaturated silty sand. The calculated cone tip resistance is used to evaluate the liquefaction potential of unsaturated soils. The results from the stress based liquefaction potential analysis reveal that even in an unsaturated condition soil is susceptible to liquefaction. By applying the pseudo strain concept, it is possible to account for the viscous resistance of water during cyclic loading. The results of undrained cyclic triaxial tests are used to calculate pseudo-strain and dissipated pseudo strain energy. The results of calculated dissipated pseudo strain energy suggest that the effect of initial matric suction is evident. On the other hand, the effect of surface tension increase or decrease due to existence of chemical on the pore water is negligible.
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Più fonti

Libri sul tema "Soil Stress"

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Dynamics of wheel-soil systems: A soil stress and deformation-based approach. Boca Raton, FL: Taylor & Francis, 2012.

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2

Ling, Hoe I., Luigi Callisto, Dov Leshchinsky e Junichi Koseki, a cura di. Soil Stress-Strain Behavior: Measurement, Modeling and Analysis. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6146-2.

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3

Vladimír, Kolář. Contact stress and settlement in the structure-soil interface. Prague: Academia, 1991.

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4

Ruenkrairergsa, Teeracharti. Stress-strain and strength characteristics of undisturbed granitic soil. Bangkok: Dept. of Highways, Ministry of Communications, Thailand, 1985.

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5

Mohr circles, stress paths, and geotechnics. 2a ed. New York: Spon Press, 2003.

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Parry, R. H. G. Mohr circles, stress paths and geotechnics. 2a ed. London: Spon Press, 2004.

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Mohr circles, stress paths, and geotechnics. London: Spon, 1995.

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8

Soil physics, application under stress environments: Proceedings of the International Symposium on Applied Soil Physics in Stress Environments, 22-26 January 1989, Islamabad, Pakistan. Islamabad: Barani Agricultural Research and Development Project, 1990.

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9

Harris, David W. Dynamic effective stress finite element analysis of dams subjected to liquefaction. Denver, Colo: Embankment Dams Branch, Division of Dam and Waterway Design, Engineering and Research Center, U.S. Dept. of the Interior, Bureau of Reclamation, 1986.

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10

Chung, R. M. Development of an NBS polymer gage for dynamic soil stress measurement. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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Capitoli di libri sul tema "Soil Stress"

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Craig, R. F. "Effective stress". In Soil Mechanics, 15–21. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-3772-8_3.

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Zarea, Mohammad Javad, Pooja Chordia e Ajit Varma. "Piriformospora indica Versus Salt Stress". In Soil Biology, 263–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-33802-1_16.

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Barnes, G. E. "Effective Stress and Pore Pressure". In Soil Mechanics, 70–90. London: Macmillan Education UK, 1995. http://dx.doi.org/10.1007/978-1-349-13258-4_4.

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Barnes, G. E. "Contact Pressure and Stress Distribution". In Soil Mechanics, 91–103. London: Macmillan Education UK, 1995. http://dx.doi.org/10.1007/978-1-349-13258-4_5.

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Barnes, Graham. "Effective stress and pore pressure". In Soil Mechanics, 105–41. London: Macmillan Education UK, 2017. http://dx.doi.org/10.1057/978-1-137-51221-5_4.

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Barnes, Graham. "Contact pressure and stress distribution". In Soil Mechanics, 142–60. London: Macmillan Education UK, 2017. http://dx.doi.org/10.1057/978-1-137-51221-5_5.

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Barnes, Graham. "Effective stress and pore pressure". In Soil Mechanics, 97–131. London: Macmillan Education UK, 2010. http://dx.doi.org/10.1007/978-0-230-36677-0_4.

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Barnes, Graham. "Contact pressure and stress distribution". In Soil Mechanics, 132–49. London: Macmillan Education UK, 2010. http://dx.doi.org/10.1007/978-0-230-36677-0_5.

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Verruijt, Arnold. "Stress Paths". In An Introduction to Soil Mechanics, 205–11. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61185-3_25.

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Shankar, Sriram, Ekramul Haque, Tanveer Ahmed, George Seghal Kiran, Saqib Hassan e Joseph Selvin. "Rhizobia–Legume Symbiosis During Environmental Stress". In Soil Biology, 201–20. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51916-2_13.

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Atti di convegni sul tema "Soil Stress"

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Reed Turner e Randy L. Raper. "Soil Stress Residuals as Indicators of Soil Compaction". In 2001 Sacramento, CA July 29-August 1,2001. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2001. http://dx.doi.org/10.13031/2013.7307.

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Williams, Peter J., Thomas L. White e J. Kenneth Torrance. "The Significance of Soil Freezing for Stress Corrosion Cracking". In 1998 2nd International Pipeline Conference. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/ipc1998-2054.

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Abstract (sommario):
The microstructure of soils (the arrangement of pores and voids, aggregation and surface characteristics of particles) is substantially modified by freezing. Soils so modified differ, in a number of important properties, from soils not previously frozen. Furthermore, each time a soil is frozen there is a redistribution of particles, moisture and solutes. Corrosion of buried pipes is known to be related to the ground conditions. Accordingly the particular nature of frozen ground needs consideration in this respect. Studies of microstructure of samples of freezing, frozen and unfrozen soils, many obtained from a full-scale experimental study of the effects of freezing on a buried pipeline, have provided an explanation for measured changes in bulk geotechnical properties of the materials. The microstructure viewed by optical microscopy, reveals the soil structure as having a complex and striking dependence on freezing history. Scanning electron microscopy shows further details in clay rich soils. Freezing at temperatures occurring in nature normally does not convert all the soil water to ice. The effects of particle surface forces is to reduce the freezing point of the water nearest a mineral surface. The distribution of solutes is radically altered, with pockets of high concentration interconnected by a liquid phase of varying concentration. A variety of other effects, relating to chemical and mechanical properties of soils subjected to freezing, have been demonstrated or can be postulated. Some of these are important in corrosion phenomena. The stresses that have been shown to occur in a pipe as a result of frost heave in the freezing soil, will also tend to increase the possibility of stress corrosion cracking.
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Banerjee, Aritra, Anand J. Puppala, Prince Kumar e Laureano R. Hoyos. "Stress-Dilatancy of Unsaturated Soil". In Geo-Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482827.047.

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Murray, E. J., e V. Sivakumar. "Equilibrium Stress Conditions in Unsaturated Soil". In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)203.

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Mayne, Paul W., e Mark Styler. "Soil Liquefaction Screening Using CPT Yield Stress Profiles". In Geotechnical Earthquake Engineering and Soil Dynamics V. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481455.056.

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"Soil Response to Skidder Traffic as Indicated by Soil Stress Residuals". In 2015 ASABE International Meeting. American Society of Agricultural and Biological Engineers, 2015. http://dx.doi.org/10.13031/aim.20152190747.

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Yang, Y. M., e Hai-Sui Yu. "A Soil Model Considering Principal Stress Rotations". In Geo-Shanghai 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413388.060.

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Farouk, Hany, e Mohammed Farouk. "Effect of Soil Type on Contact Stress". In Geo-Shanghai 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413456.007.

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Cabalar, A. F., e C. R. I. Clayton. "Stress Fluctuations in a Soil Element Testing". In Fifth Biot Conference on Poromechanics. Reston, VA: American Society of Civil Engineers, 2013. http://dx.doi.org/10.1061/9780784412992.123.

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Kalvans, Andis, e Gunta Kalvane. "SOIL WATERLOGGING STRESS COMPENSATED BY ROOT SYSTEM ADAPTATION IN A POT EXPERIMENT WITH SWEET CORN ZEA MAYS VAR. SACCHARATE". In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/3.1/s12.21.

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Abstract (sommario):
Soil waterlogging due to excess moisture resulting in hypoxic soil conditions can have detrimental effect on development of many dryland plants growing in locations with temporary water logged soils. Oxygen stress in hypoxic soils can lead to decrease root water uptake and transpiration compared to well aerated soil conditions. In turn reduction of transpiration have a positive effect on soil water budget facilitating the preservation of waterlogged state of the soil. We investigate this phenomenon in a greenhouse pot experiment using sweet corn Zea mays var. saccharate as a model species. After establishment seedlings were subject to a differentiated watering regime ranging for now watering to heavy overwatering resulting in soil waterlogging and flooding. It was observed that the elongation rate of maize seedlings decreased once soil was waterlogged. However soon after soil flooding the elongation reassumed coinciding with appearance of new adventitious roots taping the water layer above flooded soils surface. It is concluded the ability of root system adaptation to change in soil water regime determines the plant species success in sites with periodically waterlogged soils. The feedback between soil aeration status and water uptake can result in swinging between waterlogged and desiccated soil conditions, providing competitive advantages to different sets of species during dry-land and wet-land phases.
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Rapporti di organizzazioni sul tema "Soil Stress"

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Olmstead, Tyler, e Erika Fischer. Estimating Vertical Stress on Soil Subjected to Vehicular Loading. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2009. http://dx.doi.org/10.21236/ada496790.

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Chung, Riley M., Anthony J. Bur e Edward Reasner. Development of an NBS polymer gage for dynamic soil stress measurement. Gaithersburg, MD: National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.ir.85-3135.

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Wong, Kwong-Kwok. Genetic Analysis of Stress Responses in Soil Bacteria for Enhanced Bioremediation of Mixed Contaminants. Office of Scientific and Technical Information (OSTI), giugno 2000. http://dx.doi.org/10.2172/827355.

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Wong, Kwong-Kwok. Genetic Analysis of Stress Responses in Soil Bacteria for Enhanced Bioremediation of Mixed Contaminants. Office of Scientific and Technical Information (OSTI), dicembre 2000. http://dx.doi.org/10.2172/827357.

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López-Soto, Jamie F., e Bryant A. Robbins. Laboratory measurements of the erodibility of gravelly soils. U.S. Army E ngineer Research and Development Center, novembre 2021. http://dx.doi.org/10.21079/11681/42443.

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Abstract (sommario):
The critical shear stress and erodibility of soil are fundamental parameters for modeling embankment breaching. Unfortunately, very few studies have examined the erosion characteristics of soils consisting predominantly of particles larger than sand. This report presents results of an experimental study in which the erosion characteristics of gravelly soils were measured. A flume apparatus was developed in which 0.45-m-square samples were extruded into confined flow. A mechanical laser system allowed the measurement of scour in real time, resulting in a continuous and automated erosion test. The critical shear stress of a uniform gravel was found to match the expected values based on the Shields diagram, while tests that were composed largely of gravel but contained other soils, such as sand, silt, and clay, varied significantly with the critical shear stress and erodibility, depending highly on the characteristics of the finer soils.
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Mosquna, Assaf, e Sean Cutler. Systematic analyses of the roles of Solanum Lycopersicum ABA receptors in environmental stress and development. United States Department of Agriculture, gennaio 2016. http://dx.doi.org/10.32747/2016.7604266.bard.

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Abstract (sommario):
Drought and other abiotic stresses have major negative effects on agricultural productivity. The plant hormone abscisic acid (ABA) regulates many responses to environmental stresses and can be used to improve crop performance under stress. ABA levels rise in response to diverse abiotic stresses to coordinate physiological and metabolic responses that help plants survive stressful environments. In all land plants, ABA receptors are responsible for initiating a signaling cascade that leads to stomata closure, growth arrest and large-scale changes in transcript levels required for stress tolerance. We wanted to test the meaning of root derived ABA signaling in drying soil on water balance. To this end we generated transgenic tomato lines in which ABA signaling is initiated by a synthetic agonist- mandipropamid. Initial study using a Series of grafting experiments indicate that that root ABA signaling has no effect on the immediate regulation of stomata aperture. Once concluded, these experiments will enable us to systematically dissect the physiological role of root-shoot interaction in maintaining the water balance in plants and provide new tools for targeted improvement of abiotic stress tolerance in crop plants.
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Wong, K. K. Genetic analysis of stress responses in soil bacteria for enhanced bioremediation of mixed contaminants. 1997 annual progress report. Office of Scientific and Technical Information (OSTI), giugno 1997. http://dx.doi.org/10.2172/13695.

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Wong, K. K. Genetic analysis of stress responses in soil bacteria for enhanced bioremediation of mixed contaminants. 1998 annual progress report. Office of Scientific and Technical Information (OSTI), giugno 1998. http://dx.doi.org/10.2172/13696.

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Hoylman, Anne M. Fate of polycyclic aromatic hydrocarbons in plant-soil systems: Plant responses to a chemical stress in the root zone. Office of Scientific and Technical Information (OSTI), gennaio 1994. http://dx.doi.org/10.2172/10121890.

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Freeman, Stanley, Russell Rodriguez, Adel Al-Abed, Roni Cohen, David Ezra e Regina Redman. Use of fungal endophytes to increase cucurbit plant performance by conferring abiotic and biotic stress tolerance. United States Department of Agriculture, gennaio 2014. http://dx.doi.org/10.32747/2014.7613893.bard.

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Abstract (sommario):
Major threats to agricultural sustainability in the 21st century are drought, increasing temperatures, soil salinity and soilborne pathogens, all of which are being exacerbated by climate change and pesticide abolition and are burning issues related to agriculture in the Middle East. We have found that Class 2 fungal endophytes adapt native plants to environmental stresses (drought, heat and salt) in a habitat-specific manner, and that these endophytes can confer stress tolerance to genetically distant monocot and eudicot hosts. In the past, we generated a uv non-pathogenic endophytic mutant of Colletotrichum magna (path-1) that colonized cucurbits, induced drought tolerance and enhanced growth, and protected 85% - 100% against disease caused by certain pathogenic fungi. We propose: 1) utilizing path-1 and additional endophtyic microorganisms to be isolated from stress-tolerant local, wild cucurbit watermelon, Citrulluscolocynthis, growing in the Dead Sea and Arava desert areas, 2) generate abiotic and biotic tolerant melon crop plants, colonized by the isolated endophytes, to increase crop yields under extreme environmental conditions such as salinity, heat and drought stress, 3) manage soilborne fungal pathogens affecting curubit crop species growing in the desert areas. This is a unique and novel "systems" approach that has the potential to utilize natural plant adaptation for agricultural development. We envisage that endophyte-colonized melons will eventually be used to overcome damages caused by soilborne diseases and also for cultivation of this crop, under stress conditions, utilizing treated waste water, thus dealing with the limited resource of fresh water.
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