考虑土体应力依赖性的水泥混凝土路面基层力学响应研究  

Research on Mechanical Responses of the Base for Cement Concrete Pavement Considering Stress Dependence of Subgrade

作　　者：赵建斌[1] 申俊敏[1] 张艳聪[1] 

机构地区：[1]山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,太原市030006

出　　处：《公路》2014年第12期54-58,共5页Highway

基　　金：山西省交通运输厅科研项目;项目编号2012-1-3

摘　　要：土基模量是水泥混凝土路面结构设计中的一个重要参数,而在设计过程中土基模量的取值往往忽略了其应力依赖性。文中通过室内试验得出水泥混凝土路面土基的邓肯-张以及摩尔-库伦模型参数,并建立相应的车辆荷载作用下的水泥混凝土路面三维数值模型,对路面各结构层顶面沉降及土基应力分布进行了对比分析。结果表明,在考虑土体力学性质的应力依赖性时,由于土基上部围压较小,采用邓肯-张模型计算得出的土基模量小于室内承载板试验测试结果,因此模拟得出的各结构层顶面沉降明显大于摩尔-库伦模型,而土基顶面附加应力则小于采用摩尔-库伦模型的计算结果。Subgrade modulus is an important parameter for the structure design of cement concrete pavement,in the process of which,however,the stress dependence of the subgrade modulus is always neglected.In this paper,the contrastive analysis of settlements of pavement layers and the stress of the subgrade are made between constitutive models of Duncan-Chang and Mohr-Coulombin three-dimensional numerical models for the cement concrete pavement under vehicle loads,and the parameters of both constitutive models are got by laboratory tests.The results shows that：considering the stress dependence,the modulus of the upper subgrade obtained by Duncan-Changmodel is smaller than the result of the test of laboratory loading plate due to the small confining pressure,which leads to the larger settlements of pavement layers and the smaller additional stress of the upper subgrade than Mohr-Coulomb model analyzed by the numerical models.

关 键 词：道路工程 水泥混凝土路面 本构模型 沉降 附加应力 

分 类 号：U416.216[交通运输工程—道路与铁道工程]