蔡旭梅

• 1:浙江煤炭地质局勘探二队

摘要(Abstract)：

非饱和土的压缩性质与其含水率或基质吸力变化密切相关，涉及复杂的水-力耦合作用。基于塑性增量流动理论，将作者提出的弹塑性双面模型建模方法与WHEELER提出的水-力耦合硬化法则相结合，构建了一个新的模型框架，该框架可以表征非饱和黏性土的水-力学耦合压缩特性。该模型的建模要点包括：首先构建两套边界面和加载面，在边界面内，任何应力增量的产生都会导致非饱和土的塑性体积应变和饱和度发生变动；进一步地，通过独立运算两套边界面与加载面，能够单独分析水-力学耦合和力学-水耦合的作用；最终，借助数理中的一致性和插值技术，完成了塑性硬化模量的推导。利用非饱和黏性土在不同吸力和含水率状态下的多组实验数据对构建的模型进行了检验，验证结果显示该模型有效地模拟了非饱和黏性土的应力-应变关系以及水-力学耦合作用。

关键词(KeyWords)： 非饱和土;吸力;水-力耦合;硬化法则;弹塑性双面模型

Abstract:

Keywords:

基金项目(Foundation): 浙江煤炭地质局科技项目“基于‘碳中和’背景下的宁波地区工程疏挖淤泥固化技术研究”（ZMD-2022-22）

作者(Author): 蔡旭梅

参考文献(References)：

• [1]COTECCHIA F, CHANDLER R J, ANONYMOUS. The influence of structure on the pre-failure behaviour of a natural clay[J].Geotechnique, 1997, 47(3):523-544.
• [2]LEROUEIL S, VAUGHAN P R. The general and congruent effects of structure in natural soils and weak rocks[J]. Geotechnique, 1990, 40(3):467-488.
• [3]陈正汉.非饱和土与特殊土力学的基本理论研究[J].岩土工程学报，2014, 36(2):201-272.
• [4]ALONSO E E, GENS A, JOSA A. A constitutive model for partially saturated soil[J]. Geotechnique, 1990, 40(3):405-430.
• [5]WHEELER S J, SIVAKUMAR V. An elasto-plastic critical state framework for unsaturated soil[J]. Geotechnique, 1995, 45(1):35-53.
• [6]SHENG D, FREDLUND D G, GENS A. A new modelling approach for unsaturated soils using independent stress variables[J]. Canadian Geotechnical Journal, 2008, 45(4):511-534.
• [7]SHENG D, PEDROSO D M, ABBO A J. Non-convexity and stresspath dependency of unsaturated soil models[J]. Computational Mechanics, 2008, 42(5):685-694.
• [8]SUN D, MATSUOKA H. An elastoplastic model for frictional and cohesive materials and its application to cemented sands[J].International Journal for Numerical&Analytical Methods in Geomechanics, 2015, 4(6):525-543.
• [9]SUN D, MATSUOKA H, YAO Y, ICHIHARA W. An elastoplastic model for unsaturated soil in three-dimensional stresses[J].Soils and Foundations, 2000, 40(3):17-28.
• [10]SUN D A, MATSUOKA H, CUI H B, XU Y F. Three-dimensional elasto-plastic model for unsaturated compacted soils with different initial densities[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2003, 27(12):1079-1098.
• [11]GALLIPOLI D, WHEELER S J, KARSTUNEN M. Modelling the variation of degree of saturation in a deformable unsaturated soil[J].Geotechnique, 2003, 53(1):105-112.
• [12]MILLER G A, KHOURY C N, MURALEETHARAN K K, et al.Effects of soil skeleton deformations on hysteretic soil water characteristic curves:Experiments and simulations[J]. Water Resources Research, 2008, 44:1-6.
• [13]ZHOU C. Modelling of suction effect on fabric yielding and kinematic hardening of reconstituted soils[M]//BUZZI O, FITYUS S G, SHENG D, eds. Unsaturated Soils-Theoretical&Numerical Advances in Unsaturated Soil Mechanics, CRC Press, 2009:629-634.
• [14]VAN GENUCHTEN M T. A closed form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal, 1980, 44:892-898.
• [15] FREDLUND D G, XING A. Equations for the soil-water characteristic curve[J]. Canadian Geotechnical Journal, 1994, 31(4):521-532.
• [16] VAUNAT J, ROMERO E, JOMMI C. An elastoplastic hydromechanical model for unsaturated soils[M]//TARANTINO A,MANCUSO C, eds. Experimental Evidence&Theoretical Approaches in Unsaturated Soils, Balkema, Rotterdam, 2000:121-138.
• [17]SHENG D, SLOAN S W, GENS A. A constitutive model for unsaturated soils:thermomechanical and computational aspects[J].Computational Mechanics, 2004, 33:453-465.
• [18]NUTH M, LALOUI L. Advances in modelling hysteretic water retention curve in deformable soils[J]. Computers and Geotechnics,2008, 35(6):835-844.
• [19]WHEELER S J, SHARMA R S, BUISSON M S R. Coupling of hydraulic hysteresis and stress-strain behaviour in unsaturated soils[J].Geotechnique, 2003, 53(1):41-54.
• [20]MARTI L C, SANCHEZ M, WHEELER S J. Formulation of a three-dimensional constitutive model for unsaturated soils incorporating mechanical-water retention couplings[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2013, 37(17):3008-3035.
• [21]唐凯，孙少锐，宋京雷，等.降雨条件下非饱和土滑坡渗流变形模拟分析及工程治理[J].中国煤炭地质，2017, 29(8):53-59.
• [22]赵杰.不同降雨型下各向异性土质边坡的稳定性分析[J].中国煤炭地质，2018, 30(10):70-74.
• [23]李潇旋.静态与循环荷载下非饱和土的弹塑性双面模型研究[D].北京：北京交通大学，2020.
• [24]李潇旋，李涛，彭丽云.控制吸力循环荷载下非饱和黏性土的弹塑性双面模型[J].岩土力学，2020,41(2):552-560.
• [25]HOULSBY G T, PUZRIN A M. A thermomechnical framework for constitutive models for rate-independent dissipative materials[J].International Journal of Plasticity, 2000, 16(9):1017-1047.
• [26]RAVEENDIRARAJ A. Coupling of mechanical behaviour and water retention behaviour in unsaturated soils[D]. Glasgow:University of Glasgow, 2009.
• [27]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.