基于亚塑性本构模型的砂土剪切特性分析  

Analysis of shear properties of sandy soil based on hypoplastic constitutive model

作　　者：王智 吴洋 朱先发 邓人铭 张冰利 WANG Zhi;WU Yang;ZHU Xianfa;DENG Renming;ZHANG Bingli(Nantong Urban Rail Transit Co.,Ltd.,Nantong 226007,Jiangsu,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]南通城市轨道交通有限公司,江苏南通226007 [2]同济大学地下建筑与工程系,上海200092

出　　处：《隧道与地下工程灾害防治》2022年第4期59-67,共9页Hazard Control in Tunnelling and Underground Engineering

摘　　要：为了探究砂土的剪切特性,通过有限元方法,采用亚塑性本构模型模拟砂土的三轴压缩试验并进行准确性验证。利用该模型分析砂土土体初始条件对砂土剪切力学特性的影响。研究结果表明亚塑性模型准确性较高,能够反映砂土在三轴压缩试验下的应力-应变关系,且砂土的围压和密实度对砂土在剪切时的硬化特性和剪缩现象有显著影响。基于模拟计算结果进一步分析亚塑性本构模型中各个参数对砂土剪切过程中偏应力和体积应变的影响,发现颗粒硬度等4个指标对砂土剪切时偏应力和体积应变的影响非常大。In order to explore the shear characteristics of sand,the finite element method was used to simulate the triaxial compression experiment of sand with a subplastic constitutive model and the accuracy was verified.The model was used to carry out some analysis on the influence of the initial conditions of the sandy soil on the shear mechanical properties of the sandy soil.The research results showed that the model had high accuracy and could reflect the stress-strain relationship of sand under triaxial compression experiments,and the confining pressure and compactness of sand had significant effects on the hardening characteristics and shearing phenomenon of sand during shearing impact.Based on the simulation results,the effects of various parameters in the hypoplastic constitutive model on the deviatoric stress and volumetric strain during the shearing process of sand were further analyzed.

关 键 词：砂土 剪切特性 三轴压缩试验 亚塑性本构 

分 类 号：TU43[建筑科学—岩土工程]