Experimental Study on High Temperature Shear Strength Parameter of Salt Rock

摘要

There were some relationships between Shear strength parameters and the thermal effectiveness when the salt rocks under the high temperature.According to the engineering characteristics of the salt cavern gas storage,the triaxial compression tests of Huai'an and Pingdingshan's salt rock under different high temperatures are carried out.It discussed on the changing law of salt rock shear strength parameters under different confining pressure,normal temperature and high temperature; According to the Mohr-Coulomb condition,it established the relationship of salt rock’s shear strength parameters under high temperature and high temperature variation,and makes a comparative analysis on shearing strength parameters of normal temperature and high temperature condition.The research indicated that the salt rock shear strength parameters decreased with the increase of temperature under high temperature.As the temperature increased,the reduced rate presented decay trend; The shear strength parameters of salt rock under high temperature is always less than the low temperature.Experimental results and conclusions are available for salt cavern gas storage stability evaluation reference.%高温状态下的盐岩剪切强度参数与温度热效应存在一定关系,根据盐穴储气库的工程特点,对某两处库区的盐岩岩样进行了不同高温条件下的三轴压缩试验,探讨了不同围压水平和不同高温条件的盐岩剪切强度参数变化规律;针对Mohr-Coulomb条件,利用热损伤模型建立了高温状态下盐岩剪切强度参数与高温温度变化关系,并将两处常温与高温状态下的剪切强度参数进行了比较分析.研究表明高温状态下的盐岩剪切强度参数随着温度的增加而减小;高温状态下盐岩的剪切强度参数总是小于常温状态下的剪切强度参数.