防灾减灾工程学报2025，Vol.45Issue(5)：1005-1013,9.DOI:10.13409/j.cnki.jdpme.20250427002
黏土岩的三维非正交弹塑性本构模型
A Three-dimensional Non-orthogonal Elastoplastic Constitutive Model for Claystone
摘要
Abstract
Claystone,as a typical cohesive-frictional geological material,exhibits complex hardening patterns and dilatancy characteristics due to the dynamic evolution of cohesion and internal friction an-gle caused by mineral particle interlocking and clay matrix deformation under stress.Based on a cohe-sion-friction combined hardening pattern and a non-orthogonal plastic flow rule,this study constructed a three-dimensional non-orthogonal elastoplastic constitutive model for claystone.First,the evolution patterns of cohesion and internal friction angle during the hardening/softening processes were inverse-ly derived using the Mohr-Coulomb strength criterion and multiaxial test data of claystone.These evo-lution patterns were then quantitatively described by introducing two independent hardening/softening functions.Subsequently,a stress-dependent plastic internal variable was proposed to effectively char-acterize the brittle behavior of claystone under low confining pressure and the ductile behavior under high confining pressure.By employing the fractional derivative,the non-orthogonal direction of the yield function was directly obtained as the plastic flow direction,thereby avoiding the complex process of constructing a plastic potential function in the non-orthogonal flow rule.Finally,the rationality of the model was evaluated through multiple sets of conventional triaxial drained tests.The results showed that the proposed model could reasonably describe the typical nonlinear mechanical behaviors of claystone,including strain hardening/softening characteristics,shear contraction/dilation phenome-na,and the brittle-ductile transition under different confining pressures.This study provides a reliable constitutive model for the theoretical analysis and numerical simulation of the engineering mechanical properties of claystone.关键词
黏土岩/本构模型/非正交流动法则/塑性/黏聚-摩擦联合硬化Key words
claystone/constitutive model/non-orthogonal flow rule/plasticity/cohesion-friction combined hardening分类
建筑与水利引用本文复制引用
路德春,陈力伟,周鑫,邢辉辉,姜美玲,杜修力..黏土岩的三维非正交弹塑性本构模型[J].防灾减灾工程学报,2025,45(5):1005-1013,9.基金项目
国家重点研发计划项目(2023YFC3009300)、国家自然科学基金项目(52025084,52408374)资助 （2023YFC3009300）
