| 考虑毛细滞回效应的非饱和多孔介质渗流与变形耦合本构模型 |
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| 引用本文： | 马田田,韦昌富,李幻,陈盼,魏厚振.考虑毛细滞回效应的非饱和多孔介质渗流与变形耦合本构模型[J].岩土力学,2011,32(Z1):198-204. |
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| 作者姓名： | 马田田 韦昌富 李幻 陈盼 魏厚振 |
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| 作者单位： | 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室 |
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| 基金项目： | 国家自然科学基金(No.10872211);中国科学院百人计划择优项目;中国科学院岩土力学与工程国家重点实验室开放基金―土质边坡稳定与防护(No.Q110601) |
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| 摘 要： | 在Wheeler本构模型框架的基础上,提出了一个水力与力学耦合的本构模型。该模型中的土-水特征曲线采用毛细滞回内变量模型,能够更好地描述水力历史变化下毛细滞回现象对非饱和多孔介质变形的影响,同时也可描述非饱和多孔介质变形对渗流的影响。非饱和土的强度不仅与吸力有关,而且受到饱和度的影响。相同的吸力下,土样经过吸湿和脱湿路径的饱和度不同,因此,非饱和土的强度也不同。此模型以体积含水率的塑性变化和体变的塑性变化为硬化参数,不仅能描述基质吸力对非饱和土的强化作用,而且考虑了饱和度对强度及变形的影响。试验结果与模型预测基本吻合,证明该模型能够模拟非饱和土的主要特性。为了简化,此模型是在各向同性荷载下推得的,有待于推广到一般的应力状态。
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| 关 键 词： | 非饱和多孔介质 本构模型 毛细循环 渗流与变形耦合 |
| 收稿时间： | 2010-11-04 |
Hydro-mechanical coupling model of unsaturated porous media considering effect of capillary hysteresis |
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| MA Tian-tian,WEI Chang-fu,LI Huan,CHEN Pan,WEI Hou-zhen.Hydro-mechanical coupling model of unsaturated porous media considering effect of capillary hysteresis[J].Rock and Soil Mechanics,2011,32(Z1):198-204. |
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| Authors: | MA Tian-tian WEI Chang-fu LI Huan CHEN Pan WEI Hou-zhen |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | Based on the Wheeler model, a hydro-mechanical coupling model of unsaturated porous media is presented. The formulation of capillary hysteresis with internal state variables is adopted as the soil-water characteristic curve in this model. The effect of capillary hysteresis in the hydraulic history on the deformation of unsaturated porous media and the effect of deformation of unsaturated porous media on the flow processes can be simulated by this new model. The strength of unsaturated soil is related to suction and the saturation degree. Although the soil experienced drying and wetting have the same suction value, the saturation degrees are different. So the strengths of unsaturated soils are different too. The irrecoverable change in volume fraction of water and the plastic volume deformation are used to be hardening parameters. The new model can be used to describe the effect of the saturation degree on strength and deformation, in addition to the hardening effect of matric suction on the unsaturated soils. The comparisons between the model predictions and test results confirm that the model can simulate the main features of unsaturated soil behavior. The theoretical framework is developed for the isotropic loading condition; so its generalization to a more general stress space is needed in the future |
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| Keywords: | unsaturated porous media constitutive model capillary hysteresis coupling of hydraulic and mechanic |
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