动荷载下砂土与EPS颗粒混合的轻质土(LSES)的强度标准及破坏机理研究  

Study on strength criteria and failure mechanism of lightweight sand-EPS beads soil(LSES) under dynamic loads

作　　者：王庶懋[1] 高玉峰[1] 张益纯 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098 [2]常州广景房地产开发有限公司,江苏常州213001

出　　处：《河海大学学报（自然科学版）》2007年第2期197-201,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金资助项目(50479020)

摘　　要：砂土与EPS颗粒混合的轻质土(LSES)是一种在室内试验及现场应用中都难以饱和的土工材料,因此其动强度只能选择应变作为破坏标准.通过分析LSES的强度组成和动三轴试验结果,认为其在动荷载下的应变累积经历了3个阶段:初压阶段、强化阶段和破坏阶段,并由此选择压应变的最大值作为其破坏应变εaf.围压、水泥掺入量和EPS体积分数对εaf都有显著影响.随着围压和EPS体积分数的增大,εaf增大;而随着水泥掺入量的增大,由于LSES塑性的变化,εaf则经历了先增后减的过程.The Lightweight Sand-EPS beads Soil （LSES） is difficult to be saturated in both laboratory tests and field applications, therefore, only strain can be chosen as the failure criteria for its dynamic strength. Through an analysis of strength components and the result of dynamic triaxial tests of LSES, it is considered that the process of strain accumulation could be divided into three stages： the initial compression stage, the intensifying stage, and failure stage, and the maximum compression strain could be chosen as the failure strain εaf. Moreover, the confining pressure, cement content, and EPS content are of great influences on εaf, and εaf increases with the confining pressure and EPS content. With the increase of cement content, εaf experiences a process of increasing at first and then decreasing due to the variation of the plasticity of LSES.

关 键 词：砂土与EPS颗粒混合的轻质土(LSES) 动强度标准 破坏机理 破坏应变 

分 类 号：TU521[建筑科学—建筑技术科学]