不同加载方式下土石混合体抗压强度的规律性研究  

Compressive strength of rock and soil aggregate under different loading conditions

作　　者：李志刚[1] 冯春[1] 李世海[1] 

机构地区：[1]中国科学院力学研究所,北京100190

出　　处：《水运工程》2015年第6期10-16,共7页Port & Waterway Engineering

基　　金：中国科学院战略性先导科技专项(XDB10030303)

摘　　要：土石混合体的非均匀性决定了其在等应力(柔性)以及等位移(刚性)两种加载方式下的力学性能的不同。基于CDEM软件及块石随机生成算法,分别采用等应力和等位移两种加载方式,对土石混合体的单轴压缩进行了数值分析,得到了不同加载方式下土石混合体单轴抗压强度随含石率的变化曲线。结果表明:1)土石混合体等应力加载的抗压强度较等位移加载的抗压强度低,且随着含石率的增加,两者差异逐渐增大;2)两种加载方式下,土石混合体的单轴抗压强度随着含石率的增加而增加,且含石率超过30%后强度增加速率加快;3)随着含石率的增加,土石混合体的宏观应力应变曲线呈现强化趋势。The heterogeneity of soil and rock aggregate（SRM） determines its different mechanical properties under equal stress and equal displacement loading conditions. Based on the software of CDEM and the random generation algorithm of rock block and applying equal displacement and equal stress load conditions respectively, we study the uniaxial compressive strength of soil-rock aggregates and obtain the constitutive curves of aggregate with different rock contents. The results show that： 1） The strength under equal stress load condition is lower than that under equal displacement load condition. And the difference becomes larger with the increase of rock content; 2） With the increase of rock content, the compressive strength of the composite gradually increases. And after the rock content exceeds 30%, the compressive strength increases more quickly; 3） With the increase of rock content, SRM＇s macroscopic stress-strain curves show gradual strengthening tendency.

关 键 词：等应力加载 等位移加载 土石混合体 CDEM 数值模拟 

分 类 号：O39[理学—工程力学]