考虑应力路径影响下砂土的三维本构模型  

Three-dimensional constitutive model of sand considering stress path

作　　者：罗汀[1] 路德春[1] 姚仰平[1] 

机构地区：[1]北京航空航天大学土木工程系,北京100083

出　　处：《岩土力学》2004年第5期688-693,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金委资助项目(No.10272010)。

摘　　要：应力路径是影响土的应力-应变关系的一个重要因素。通过对一组砂土(日本Toyoura砂)三轴试验结果的详细分析,揭示了应力路径对剪应变及体积应变的影响规律,进而建立了能反映应力路径影响的应力-应变增量本构模型,提出的统一硬化参数反映了其剪胀特性,引入的变换应力能反映三维应力-应变特性。The stress path is a very important factor effecting soil stress-strain relationship. A new stress-strain increment model considering stress path is proposed based on triaxial compression tests of Japanese Toyoura sand. The dilatancy of sand is described by use of a hardening parameter proposed by authors. The three-dimensional stress-strain behavior of sand is described by a transformed stress tensor based on the Spatially Mobilized Plane (SMP) criterion.

关 键 词：应力-应变关系 应力路径 三维 砂土 

分 类 号：TU441[建筑科学—岩土工程] TB115[建筑科学—土工工程]