饱和冻结粉土在常应变率下的单轴抗压强度  

COMPRESSIVE STRENGTH OF SATURATED FROZEN SILT UNDER CONSTANT STRAIN RATE

作　　者：张俊兵[1] 李海鹏[2] 林传年[1] 朱元林[1,3] 

机构地区：[1]兰州大学资源环境学院 [2]中国科学院兰州寒区旱区环境与工程研究所冻土工程国家重点实验室 [3]中国科学院兰州寒区旱区环境与工程研究所冻土工程国家重点实验室兰州730000

出　　处：《岩石力学与工程学报》2003年第z2期2865-2870,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(40171021);中国科学院兰州寒区旱区环境与工程研究所知识创新工程(CACX210053)资助项目。

摘　　要：在常应变率下对饱和冻结兰州粉土(黄土)进行了单轴抗压强度试验。通过对试验资料的分析,得出如下规律:(1) 抗压强度对温度十分敏感,它随着温度降低以幂函数的形式增加。(2) 在一定应变率范围内抗压强度对应变率变化反应也比较敏感,它以幂函数的形式随着应变率的增加而增加。(3) 在一定破坏时间范围内抗压强度随着破坏时间的增长同样以幂函数规律减小。(4) 在应变率及温度相同条件下,干容重大的粉土抗压强度高于干容重小的粉土抗压强度,二者的差异程度主要受应变率的影响。Uniaxial compressive strength tests are conducted on the saturated frozen Lanzhou silt (loess) under various constant strain rates and various constant temperatures. From the test results,it is concluded that (a) compressive strength is very sensitive to temperature and increases exponentially as temperature decreases,(b) compressive strength is sensitive to strain rate and increases exponentially as strain rates increase within certain range,(c) compressive strength decreases exponentially as failure time increases,and (d) compressive strength of the saturated frozen silt with higher dry density is higher than that of frozen silt with lower dry density. The increment rate of compressive mainly depends upon strain rate.

关 键 词：土力学 冻结粉土 单轴抗压强度 常应变率 

分 类 号：P642.14[天文地球—工程地质学]