Stress State Variables for Saturated and Unsaturated Soils

Zhang, Xiong; Lytton, Robert L.

doi:10.1061/40802(189)202

Cited by 10 publications

(9 citation statements)

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“…Consequently, three stress variables instead of two are required. Zhang and Lytton [15] also pointed out that net stress and the matric suction are not a sufficient set of stress state variables (to describe unsaturated soil behavior), because the unsaturated soil status can vary due to the change of air phase volume, even though the net stress and the matric suction are not changed. If the net stress and matric suction are the only two known stress variables, the soil stress state (i.e.…”

Section: Selection Of Stress State Variablesmentioning

confidence: 97%

Constitutive modeling for unsaturated soils considering gas hardening effect

et al. 2011

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The influence of gases on unsaturated soils is discussed in the paper. First, the selection of stress state variables is discussed. It is shown that gas pressure as well as generalized effective stress and modified suction are required to construct a constitutive model of an unsaturated soil. The deformation mechanisms of solid, liquid and gas phases in soils are then investigated. It is realized that the deformation of gas phase interacts with the deformations of the other two phases in soils. Gas laws are used to describe the gas behavior. Similar to the other two phases in soil, the change of gas volume can be divided into an elastic part and a plastic part, and the latter part is then introduced to the soil hardening equation to reflect the impact of the gas on the soil. Then, a simple elasto-plastic model considering the gas effect for isotropic states is developed. Finally, the model predictions are given and compared with existing experimental data. A good agreement between them is found. Comparisons of the predictions between our model and Wheeler's model are also performed. gas effect, unsaturated soils, elasto-plastic constitutive modeling Citation:Liu Y, Zhao C G, Cai G Q, et al. Constitutive modeling for unsaturated soils considering gas hardening effect.

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Section: Selection Of Stress State Variablesmentioning

confidence: 97%

Constitutive modeling for unsaturated soils considering gas hardening effect

et al. 2011

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“…但是这只是一种简化的做法, Tarantino 和 Mongiovì [14] 指出: 零位实验所采用的轴平移技术在气相封闭的条件下不再适用, 此时就必须使用三个而不是两个独立的应力变量来描述土的行为. Zhang 和 Lytton [15] [15] .…”

Section: 非饱和土与饱和土的根本区别在于孔隙中存在着气体以及气-水-土骨架之间复杂的界面现象及其unclassified

考虑气相硬化影响的非饱和土本构模型

刘¹,

黄²,

赵³

et al. 2010

Chin. Sci. Bull.

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“…While major progress has been made, it is apparent that additional research is needed to improve and validate existing models and develop new models. This realization is based partly on the following observations: first, there is a wide variety of opinions regarding the proper selection of stress state variables for unsaturated soil [e.g., Fredlund and Morgenstern , 1977; Wheeler and Sivakumar , 1995; Gallipoli et al , 2003; Khalili et al , 2004; Lu and Likos , 2004; Zhang and Lytton , 2006]. Second, as noted above, there are relatively few models incorporating hysteresis in existence and none are widely accepted, partly because they are relatively recent.…”

Section: Introductionmentioning

confidence: 99%

Effects of soil skeleton deformations on hysteretic soil water characteristic curves: Experiments and simulations

Miller

Khoury

Muraleetharan

et al. 2008

Water Resources Research

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[1] Soil water characteristic curves (SWCCs) represent the relationship between suction and water content in unsaturated soils. The SWCCs exhibit hysteresis during wettingdrying cycles; however, the empirical expressions used to describe SWCCs have typically ignored the hysteresis. Additionally, the shape of the SWCC will vary depending on the void ratio of the soil and changes resulting from soil skeleton deformations, which may also show hysteretic behavior under various loading conditions. Therefore, it is important to investigate, both experimentally and theoretically, the relationship between soil skeleton deformations and the SWCC for different soils. There is limited information in the literature that examines, both experimentally and theoretically, the complex coupling between the soil skeleton deformation and SWCC behavior, and generally, this behavior is not well understood. This paper presents laboratory test results of SWCCs determined under different confining stresses on similarly prepared samples of a silty soil; drying, wetting, second drying, and scanning curves were obtained. The influence of soil skeleton deformations on SWCCs is inferred from the curves measured in an oedometer under different stress conditions. An elastoplastic phenomenological constitutive model based on the bounding surface plasticity theory was utilized to simulate the coupled mechanical-hydraulic behavior of measured results. This research demonstrates that the model is capable of predicting hysteresis in SWCCs and soil skeleton deformation and the coupling between the hydraulic and mechanical behavior of unsaturated soils.

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Stress State Variables for Saturated and Unsaturated Soils

Cited by 10 publications

References 0 publications

Constitutive modeling for unsaturated soils considering gas hardening effect

Constitutive modeling for unsaturated soils considering gas hardening effect

考虑气相硬化影响的非饱和土本构模型

Effects of soil skeleton deformations on hysteretic soil water characteristic curves: Experiments and simulations

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