不排水条件下非饱和土水力-力学耦合特性数值模拟

刘文化; 杨庆; 唐小微; 渦岡良介

doi:10.11779/CJGE201703012

不排水条件下非饱和土水力-力学耦合特性数值模拟 English Version

1. 江南大学环境与土木工程学院,江苏无锡 214122;
2. 大连理工大学海岸和近海工程国家重点实验室,辽宁大连 116024;
3. 德岛大学工学部,日本德岛 770-8506

基金项目: 国家自然科学基金项目（51179023,41572252）

详细信息

作者简介:
刘文化(1987- ),男,博士,主要从事非饱和土的静、动力特性试验及本构关系研究。E-mail: wenhualiudlut@163.com。

计量
- 文章访问数: 462
- HTML全文浏览量: 2
- PDF下载量: 390
出版历程
- 收稿日期: 2015-12-27
- 发布日期: 2017-04-24

Numerical simulation of hydro-mechanical behaviors of unsaturated soils under fully undrained conditions

1. School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China;
2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;
3. Department of Civil Engineering, The University of Tokushima, Tokushima 770-8506, Japan

摘要

摘要: 非饱和土即便在不排水、不排气条件下也将发生体变,这为预测非饱和土不排水、不排气力学特性带来了困难。基于三相孔隙介质理论,结合非饱和土的弹塑性本构模型推导了不排水、不排气条件下非饱和土三轴剪切三相耦合控制方程,对非饱和土的不排水、不排气三轴剪切特性进行预测。数值模拟结果表明,此方法能够描述非饱和土在不排水、不排气条件下的水力-力学特性,如体缩特性、孔隙水压力和孔隙气压力增长以及饱和度增大等特性。数值计算结果与室内试验结果一致,证实了所提数值分析方法的合理性。
- 非饱和土 /
- 不排水 /
- 水力-力学耦合 /
- 孔隙介质理论 /
- 数值模拟
Abstract: Volume changes take place during the fully undrained compression tests on unsaturated soils. It is more difficult to simulate the undrained mechanical behaviors of unsaturated soils than those of saturated soils. In this study, the three-phase coupled governing equations for unsaturated soils under fully undrained conditions are derived using the porous medium theory and the elasto-plastic constitutive model for unsaturated soils. Numerical simulations of the fully undrained triaxial compression tests on unsaturated soils are performed based on the proposed three-phase coupled governing equations. The simulated results demonstrate that the proposed method predicts the hydraulic and mechanical behaviors (shear-induced volume compression, pore water pressure, pore air pressure and degree of saturation increase) of unsaturated soils accurately under the fully undrained conditions. The predictions of the fully undrained triaxial tests on unsaturated soils show good agreement with the test results obtained in literatures, verifying the applicability of the proposed method.
- unsaturated soil /
- undrained condition /
- hydro-mechanical coupling /
- porous medium theory /
- numerical simulation

HTML全文

参考文献(21)

[1]	ALONSO E E, GENS A, JOSA A. A constitutive model for partially saturated soils[J]. Géotechnique, 1990, 40(3): 405-430.
[2]	陈正汉, 黄海, 卢再华. 非饱和土的非线性固结模型和弹塑性固结模型及其应用[J]. 应用数学和力学, 2001, 22(1): 93-103. (CHEN Zheng-han, HUANG Hai, LU Zai-hua. Non-linear and elasto-plasticity consolidation models of unsaturated soil and applications[J]. Applied Mathematics and Mechanics, 2001, 22(1): 93-103. (in Chinese))
[3]	GALLIPOLI D, GENS A, SHARMA R, et al. An elasto-plastic model for unsaturated soil incorporating the effects of suction and degree of saturation on mechanical behaviour[J]. Géotechnique, 2003, 53(1): 123-136.
[4]	WHEELER S, SHARMA R, BUISSON M. Coupling of hydraulic hysteresis and stress-strain behaviour in unsaturated soils[J]. Géotechnique, 2003, 53(1): 41-54.
[5]	SUN D, SHENG D, CUI H, et al. A density‐dependent elastoplastic hydro‐mechanical model for unsaturated compacted soils[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2007, 31(11): 1257-1279.
[6]	SHENG D, ZHOU A-N. Coupling hydraulic with mechanical models for unsaturated soils[J]. Canadian Geotechnical Journal, 2011, 48(5): 826-840.
[7]	姚仰平, 牛雷, 崔文杰, 等. 超固结非饱和土的本构关系[J]. 岩土工程学报, 2011, 33(6): 833-839. (YAO Yang-ping, NIU Lei, CUI Wen-jie, et al. UH model for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(6): 833-839. (in Chinese))
[8]	HU R, LIU H H, CHEN Y, et al. A constitutive model for unsaturated soils with consideration of inter-particle bonding[J]. Computers and Geotechnics, 2014, 59: 127-144.
[9]	卢再华, 陈正汉. 非饱和原状膨胀土的弹塑性损伤本构模型研究[J]. 岩土工程学报, 2003, 25(4): 422-426. (LU Zai-hua, CHEN Zheng-han. An elastoplastic damage constitutive model of unsaturated undisturbed expansive soil[J]. Chinese Journal of Geotechnical Engineering, 2003, 25(4): 422-426. (in Chinese))
[10]	金旭, 赵成刚, 刘艳, 等. 非饱和原状土的弹塑性损伤本构模型[J]. 北京交通大学学报, 2010, 34(1): 78-82. (JIN Xu, ZHAO Cheng-gang, LIU Yan, et al. An elasto-plastic damage constitutive model of unsaturated natural soils[J]. Journal of Beijing Jiaotong University, 2010, 34(1): 78-82. (in Chinese))
[11]	汤连生, 桑海涛, 宋晶, 等. 非饱和花岗岩残积土粒间联结作用与脆弹塑性胶结损伤模型研究[J]. 岩土力学, 2013, 34(10): 2877-2888. (TANG Lain-sheng, SANG Hai-tao, SONG Jing, et al. Research on soil particle joint function and brittle-elastoplastic cement damage model of unsaturated granite residual soil[J]. Rock and Soil Mechanics, 2013, 34(10): 2877-2888. (in Chinese))
[12]	沈珠江. 广义吸力和非饱和土的统一变形理论[J]. 岩土工程学报, 1996, 18(2): 1-9. (SHEN Zhu-jiang. Generalized suction and unified deformation theory for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 1996, 18(2): 1-9. (in Chinese))
[13]	刘旭, 王兰民, 陈龙珠, 等. 基于微结构失稳假说及广义吸力理论的黄土体变模型[J]. 岩土力学, 2007, 28(12): 2517-2523. (LIU Xu, WANG Lan-min, CHEN Long-zhu, et al. A volumetric model of loess based on microstructure instability and generalized suction theories[J]. Rock and Soil Mechanics, 2007, 28(12): 2517-2523. (in Chinese))
[14]	SUN D A, SHENG D, XIANG L, et al. Elastoplastic prediction of hydro-mechanical behaviour of unsaturated soils under undrained conditions[J]. Computers and Geotechnics, 2008, 35(6): 845-852.
[15]	UZUOKA R, UNNO T, SENTO N, et al. Effect of pore air pressure on cyclic behavior of unsaturated sandy soil[C]// The 6th International Conference on Unsaturated Soils. Sydney, 2014: 783-789.
[16]	ARMSTRONG P, FREDERICK C. A mathematical representation of the multiaxial bauschinger effect[R]. Berkeley: Berkeley Nuclear Laboratories, 1966.
[17]	ZHOU A N, SHENG D, SLOAN S W, et al. Interpretation of unsaturated soil behaviour in the stress-saturation space, I: Volume change and water retention behaviour[J]. Computers and Geotechnics, 2012, 43: 178-187.
[18]	VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal, 1980, 44(5): 892-898.
[19]	ZHOU A N, SHENG D, SLOAN S W, et al. Interpretation of unsaturated soil behaviour in the stress-saturation space, Ⅱ: Constitutive relationships and validations[J]. Computers and Geotechnics, 2012, 43: 111-123.
[20]	WHEELER S J. The undrained shear strength of soils containing large gas bubbles[J]. Géotechnique, 1988, 38(3): 399-413.
[21]	OKA F, KODAKA T, SUZUKI H, et al. Experimental study on the behavior of unsaturated compacted silt under triaxial compression[J]. Soils and Foundations, 2010, 50(1): 27-44.