含杂质盐岩力学特性对比试验研究

Experimental study on mechanical property of rock salt with impurity

从某地拟建地下盐穴储库库区取芯,对含不同杂质盐岩(纯盐岩、钙芒硝质盐岩、硬石膏质盐岩及泥质混合盐岩)进行了力学试验,并对所获得的力学特性进行了对比分析。结果表明:①在单轴和三轴压缩试验过程中,不同杂质成分对抑制盐岩的变形能力、提高盐岩抗压强度的作用有所不同;②含不同杂质盐岩的弹性模量、单轴抗压及抗拉强度有较大变化区间,钙芒硝质盐岩的弹性模量和抗拉强度较大;③通过三轴压缩试验获得含不同杂质盐岩内摩擦角的量值明显低于纯盐岩,而黏聚力均大于纯盐岩。除纯盐岩外,硬石膏质盐岩的内摩擦角和黏聚力相对较小。

Mechanical experiments were carried out on the different kinds of rock samples which are salt,mudstone,glauberite,anhydrite and salt-mudstone.The experiment results indicate that different impurities have obvious effect on the deformability and the compressive strength;The modulus of elasticity and the uniaxial strength have a large range with the kind and content of the impurities and the glauberite＇s are higher;In triaxial compression tests,pure rock salts have a higher internal friction angle and a lower cohesion than the rocks with impurities.Besides the rock salt,the internal friction angle and cohesion of anhydrite are lower than others＇.The test results provide certain reference to the design of salt cavern under complex stratum.