摘要
以青藏铁路沿线的冻结砂土为研究对象,结合铁路沿线地温和含水率的分布特征,进行了温度为-0.5～-6.0℃,含水率为30%～80%(超饱和)条件下的三轴抗压强度试验,分析了不同温度下砂土强度随含水率的变化特征以及同一含水率下砂土强度对温度的依赖性。并根据不同温度下砂土强度随法向应力的变化规律,给出了相应的冻土强度屈服准则。
According to the distributing characteristics of water content and ground temperature along Qinghai-Tibet Railway, triaxial compressive experiments of frozen sandy soils from Qinghai-Tibet plateau were conducted with 30%-80% （supersaturated）water contents and temperature ranging from -0.5℃ to -6.0℃. The results show that with increasing water content, strength of sandy soil nonlinearly increases when the testing temperatures is -0.5 ℃; and it has a minimum value with the temperature of-1.0℃, whereas when the temperature is equal to or below 2.0℃ it gradually decreases. Based on the relationship between the strength and normal stress under different temperatures, yielding criteria of Mises and linear Mohr-Coulomb is used to describe the yielding situation of sandy soil, respectively.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第12期3665-3670,共6页
Rock and Soil Mechanics
基金
国家自然科学基金重点资助项目(No.40730736)
中国科学院知识创新工程重要方向项目(No.KZCX2-XB-10)
国家自然科学基金重点资助项目(No.40801029)
冻土工程国家重点实验室开放基金项目(No.SKLFSE-ZY-03
SKLFSE-ZY-02
SKLFSE-ZQ-01)
关键词
冻结砂土
抗压强度
超饱和高含水率
屈服准则
frozen sandy soil
compressive strength
supersaturated water content
yielding criteria
