岩土本构中应变软化与Weibull分布的思考  

On the Strain-Softening of Geotechnical Constitutive Model and Weibull Distribution

作　　者：孙强[1,2] 胡秀宏[2] 

机构地区：[1]中国科学院地质与地球物理研究所 [2]中国科学院研究生院地球科学学院

出　　处：《金属矿山》2008年第10期39-42,47,共5页Metal Mine

基　　金：中国科学院知识创新工程重要方向项目(编号:kzcx2-yw-113)

摘　　要：从本构曲线的塑性功的角度研究了应变硬化和应变软化的定义问题,引入了材料力学的微结构"自恰"原则,分析了应变软化-损伤之间的关系,同时针对岩土工程界关于应变软化介质多用负指数分布或Weibull分布描述应变本构关系,分析了Weibull分布下的应变软化介质的本构方程的参数求解模式,并对其参数特性和本构曲线的适应性进行了分析。The definition of strain-softening and strain-hardening is studied from the plastic work of constitutive curve. The relation between strain-softening and damage is analyzed by introducing the micro-structural ＂self-consistent＂ rule in mechanics of materials. In geotechnical engineering, the constitutive model for strain-softening medium is mostly described by negative exponent distribution or Weibull distribution. In view of this, the model for solving the parameters of constitutive formula for strain-softening media under Weibull distribution is analyzed and its parameter characteristics and the adaptability of the constitutive curve are also discussed.

关 键 词：岩土力学 应变软化 本构模型 WEIBULL分布 自恰准则 参数模型 

分 类 号：TU452[建筑科学—岩土工程] O213.2[建筑科学—土工工程]