岩土材料屈服轨迹的弯曲及相关问题  

Yielding loci curving and related problems of geotechnical materials

作　　者：王靖涛[1] 李国成[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2015年第10期92-95,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：基于岩土材料塑性体应变与剪应变之间的相互作用原理,讨论了岩土材料屈服轨迹的弯曲原理,并构建了本构场方程.在此基础上研究了塑性体应变和剪应变增量的方向性、非关联流动法则及应力路径相关性等问题.研究发现:由三轴实验获得的体积和剪切屈服轨迹都是弯曲的,证明了塑性体应变和剪应变之间的相互作用存在且是岩土材料变形特性产生的主要原因,塑性体应变和剪应变增量方向不再分别与p-q应力平面中P和q轴的方向始终重合;无须使用非关联流动法则.Based upon the principle of interaction between plastic volumetric and shear strains,yielding trail bending of geotechnical materials was discussed herein,and constitutive equation was proposed.The directions of plastic volumetric and shear strain increments,nonassociated flow rule and dependency of stress path were also discussed in this paper.The results indicate that all volumetric and shear yielding loci obtained by triaxial tests are curved.This confirmed that the interaction exists and that is the major origin of generation of fundamental deformation characteristics for geotechnical materials.The directions of plastic volumetric and shear strain increments no longer coincide always with those of the pand q axes in the p-q stress plane,respectively,and there is no need to use the nonassociated flow rule.

关 键 词：岩土材料 塑性体应变与剪应变 塑性势理论 非关联流动法则 应力路径相关性 

分 类 号：TU43[建筑科学—岩土工程]