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岩盐力学模型是进行能源岩盐储存工程稳定性分析的基础,而损伤和塑性机制并存且相互耦合是岩盐力学行为的基本特点。采用云应岩盐,进行了多组围压条件下的三轴压缩试验,分析了不同围压下岩盐的变形特征。在试验分析的基础上,提出了一种能够描述岩盐特性的弹塑性损伤耦合的模型,该模型描述了岩盐损伤的演化和塑性变形的耦合关系,并引入了一种非关联的塑性流动法则来描述岩盐从塑性体积压缩到膨胀的转化。采用该模型对在三轴压缩下的岩盐应力-应变关系进行了模拟分析,并与试验数据进行了对比,结果表明该模型能够较好地描述岩盐的主要力学和变形特性。
The mechanical model of rock salt is the basis for the stability analysis of energy rock salt storage project. The coexistence of damage and plastic mechanism and mutual coupling are the basic characteristics of rock salt mechanical behavior. Three-axis compression tests were carried out under multi-confining pressure conditions using cloud rock salt, and the deformation characteristics of rock salt under different confining pressures were analyzed. Based on the experimental analysis, a coupled model of elasto-plastic damage, which can describe the characteristics of rock salt, is proposed. The model describes the coupling relationship between the evolution of rock salt damage and plastic deformation, and introduces a non-associated plastic flow rule Describe the conversion of rock salt from plastic volume to expansion. The model was used to simulate the stress-strain relationship of rock salt under triaxial compression and compared with the experimental data. The results show that the model can well describe the main mechanical and deformation characteristics of rock salt.