砂土简化边界面本构模型  

A simplified bounding surface constitutive model for sandy soil

作　　者：陈锦祎 陈志波[1,2,3] 谢永宁 陈前 CHEN Jinyi;CHEN Zhibo;XIE Yongning;Chen Qian(Department of Geotechnical and Geological Engineering,Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350116,China;Fujian Provincial Universities Engineering Research Center of Geological Engineering,Fuzhou 350116,China;Key Laboratory of Geohazard Prevention of Hilly Mountains,Ministry of Natural Resources of China,Fuzhou 350116,China;Fujian Water Resources and Hydropower Research Institute,Fuzhou 350001,China)

机构地区：[1]福州大学紫金地质与矿业学院岩土与地质工程系,福建福州350116 [2]地质工程福建省高校工程研究中心,福建福州350116 [3]自然资源部丘陵山地地质灾害防治重点实验室,福建福州350116 [4]福建省水利水电科学研究院,福建福州350001

出　　处：《武汉大学学报（工学版）》2024年第3期295-301,共7页Engineering Journal of Wuhan University

基　　金：福建省水利厅科技计划项目(编号:MSK201907)。

摘　　要：基于边界面次塑性模型,简化了模型原始加载和重加载的关系,减少了模型参数,提供了一种适用于描述砂土单向荷载和循环荷载作用下应力路径和应力-应变关系的方法。引进状态参数,从而可用一套参数统一描述不同密度砂土的力学行为。使用Mathematica软件进行简化边界面模型的单元测试,并与试验数据进行对比。结果表明:此简化边界面模型能合理模拟土体复杂的力学行为,包括土体的临界状态、单向和循环荷载下体积变形的变化、应力-应变关系、围压的变化等。Based on the bounding surface hypo-plasticity model,the relationship between the original load and the reload of the model is simplified,the model parameters are reduced,and a suitable way is provided to describe the stress path and stress-strain relationship of sandy soil under unidirectional and cyclic loads.State parameter is introduced to describe the mechanical behaviors of sandy soils with different densities by a single set of parameters.Mathematica software is then employed to carry out the unit test of the simplified boundary surface model,and compared with experimental data.The results show that the simplified boundary surface model can reasonably simulate the complex sandy soil mechanical behaviors,including the critical state of soil,the change of volumetric deformation under unidirectional and cyclic loads,stress-strain relationships and the changes of confining pressures and so on.

关 键 词：砂土 边界面模型 剪胀关系 

分 类 号：TU43[建筑科学—岩土工程]