关于分级单屈服面模型的几个问题的探讨  

Discussion of some problems about HISS model

作　　者：王德玲[1] 葛修润[1] 

机构地区：[1]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《岩土力学》2004年第7期1059-1062,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.10172057)

摘　　要：在大理岩、红砂岩和花岗岩的单轴压缩和常规三轴压缩试验的基础上,发现它们的极限包络线可以大致设为一条平均直线,利用此直线可以确定其斜率和粘结应力。用于计算硬化的两个硬化系数应选取应力-应变曲线上应力峰值前若干点的数据计算。试验发现岩石的破坏与阶段改变处相距不远,不能用 Desai 提出的方法确定阶段改变参数 n。笔者认为取稍大于 2 的值是比较合适的。在预测材料的应力-应变曲线时,提出一种简单实用的方法,即把岩石初始压密阶段的终点作为初始状态,用该点的应力状态计算初始的硬化参数和累积塑性应变。Based on experiments on marble, red sandstone and granite, their ultimate envelope can be averaged as straight lines. With these lines, their slope and bonding stress can be calculated. Two hardening parameters should be decided by data of some points on stress-strain curve before peak strength. According to experiments, the occurrence of failure isn't far away from phase change, so the phase change parameter can't be computed by Desai's method. The authors think that taking a value of a little greater than 2 is appropriate. When back predicting stress-strain curve, the authors proposed a simple and applicable method, regarded the end of initial compression phase as initial condition to calculate initial hardening parameter and trajectory of plastic strains.

关 键 词：分级单屈服面模型 极限包络线 粘结应力 硬化系数 阶段改变参数 初始情况 

分 类 号：TU4[建筑科学—土工工程]