基于非线性强度准则的城市固废本构模型  

A Constitutive Model for the Municipal Solid Waste Based on Nonlinear Strength Criterion

作　　者：吕玺琳[1,2] 黄茂松[1,2] 王蓉[3] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学土木工程学院,上海200092 [3]上海岩土工程勘察设计研究院有限公司,上海200032

出　　处：《同济大学学报（自然科学版）》2015年第9期1308-1312,共5页Journal of Tongji University:Natural Science

基　　金：国家"九七三"重点基础研究发展规划(2012CB719803);上海市自然科学基金(13ZR1443800);中央高校基本科研业务费专项资金

摘　　要：考虑到城市固体废弃物(MSW)抗剪强度常具有非线性的特点,建立了一个基于幂函数形式的强度准则.并据此分析了该准则转换为线性Mohr-Coulomb准则时摩擦角的变化规律.结果表明,该准则能合理反映内摩擦角随围压增大而降低的特性.基于幂函数强度准则,采用增量硬化准则建立屈服函数,并通过构建合理的塑性势函数,建立了一个非相关联流动法则的固废弹塑性本构模型.通过对固废三轴固结排水试验结果模拟表明,所建立的本构模型不仅能合理模拟应力-应变关系,亦能正确反映其体变特性.Considering the nonlinear characteristic of the shear strength of the municipal solid waste（MSW）, a power function strength criterion was proposed. According to the proposed criterion, the friction angle corresponding to the linear Mohr-Coulomb criterion was obtained, and it was shown to decrease with the increasing of the initial confining stress. By adopting the incremental hardening rule and suitable plastic potential function, a non-associated elasto-plasticity model was built. By predicting a series of consolidated drained triaxial tests of MSW, the proposed model was shown to be able to predict the stress-strain relationships of MSW rightly and could give out reasonable volumetric strain.

关 键 词：城市固废 非线性强度 弹塑性 本构模型 

分 类 号：TU432[建筑科学—岩土工程]