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基于三轴压缩试验,分析三轴压缩过程中盐岩的应变变化特点,定义压缩扩容边界点为最大体应变点。根据岩石内部裂隙发展演化情况,分析与其相应的盐岩内部特征量,得出孔隙率的改变是导致盐岩应变变化的内部原因。根据这一分析成果,定义不同应力状态下的孔隙率为损伤变量,得出不同损伤状态下盐岩孔隙率的变化情况,得到盐岩损伤与体应变关系式。该关系式定量表达了盐岩损伤与体应变之间的关系,为进一步研究盐岩在不同损伤状态下的气体渗透规律提供了理论基础。
Based on the triaxial compression test, the characteristics of strain change of rock salt during triaxial compression are analyzed, and the boundary point of compression and expansion is defined as the maximum bulk strain point. According to the development and evolution of the internal fissures in the rock, the corresponding internal characteristics of the salt rock are analyzed. It is concluded that the change of porosity is the internal cause of the strain change of the rock salt. According to the results of this analysis, the porosity under different stress states is defined as the damage variable, and the change of porosity of salt rock under different damage states is obtained. The relationship between salt rock damage and body strain is obtained. The relationship quantitatively expresses the relationship between salt rock damage and body strain, which provides a theoretical basis for further study on gas infiltration rules of salt rock under different damage conditions.