基于相变状态的饱和砂土循环荷载边界面模型  

CYCLIC LOADING BOUNDARY SURFACE MODEL OF SATURATED SAND BASED ON PHASE TRANSITION STATE

作　　者：董晓丽[1] 赵成刚[2,3] 张卫华[1] 赵春雷[2] 

机构地区：[1]北京城市学院城市建设学部,北京100083 [2]北京交通大学土建学院,北京100044 [3]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《工业建筑》2016年第7期129-133,139,共6页Industrial Construction

基　　金：国家"973计划"项目(2015CB0578000);国家自然科学基金项目(51478135)

摘　　要：在修正剑桥模型屈服面基础上,对循环荷载作用下,压缩及张拉空间的剪胀应力比Mc,ed以相变状态参数表达,模型采用与应力路径无关的硬化参数来替代修正剑桥模型中的塑性体应变增量,采用随动硬化规则。经排水及不排水循环试验结果验证,该模型较适合模拟剪胀性饱和砂土在循环荷载作用下的力学行为,如剪胀、硬化及软化现象等。模型的10个参数,用常规三轴试验就可获取。Basing on the modified Cambridge model,the compressed and stretched dilatancy stress ratio under cyclic loading was expressed by phase transformation state parameters in the model, and the hardening parameter independent of stress path was used to replace the plastic volumetric strain increment of the modified Cambridge model,and also the kinematic hardening rule was used. The results verified that the model was suitable for simulating the mechanical behavior of the saturated sand under cyclic loading,such as dilation,hardening and softening. A total of 10 parameters of the model were obtained by using the conventional triaxial test.

关 键 词：相变状态 饱和砂土 剪胀 边界面模型 循环荷载 

分 类 号：TU441[建筑科学—岩土工程]