Although the traditional phenomenological mechanical model of rock salt based on macro-mechanical experiments adequately describes its macroscopic mechanical behavior, the effect of the microstructure of this mineral on its macro-mechanical properties and intrinsic physical deformation and failure processes remains unclear. Therefore, in this study, scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) were used to investigate the grain boundaries and grain size distribution, and a nanoindentation technique was employed to analyze the elastic characteristics of the grains, to better understand the structural and mechanical characteristics of rock salt on a microscopic scale. Furthermore, a multiscale numerical model of polycrystalline rock salt based on the microstructure was established, using the specified particle size Voronoi polyhedron modeling method and the discrete element method. In addition, numerical models were constructed with different embedded grain size distribution characteristics, enabling the effects of the distribution parameters on the mechanical behavior to be clarified in detail. The results indicated that the macroscopic mechanical behavior of rock salt is simultaneously determined by the physical and mechanical properties of the grains and grain boundaries. In addition, the resulting simulation results based on the numerical models indicate that the strength and ductility of rock salt are affected by the average diameter, heterogeneity index and skewness coefficient.

尽管基于宏观力学实验的传统岩盐现象力学模型充分描述了其宏观力学行为，但该矿物的微观结构对其宏观力学性能以及固有物理变形和破坏过程的影响仍不清楚。因此，在这项研究中，使用扫描电子显微镜（SEM）和电子背散射衍射（EBSD）来研究晶粒边界和晶粒尺寸分布，并采用纳米压痕技术分析晶粒的弹性特征，以更好地了解晶粒的弹性。微观范围内岩盐的结构和力学特性。此外，建立了基于微结构的多晶岩盐多尺度数值模型，使用指定的粒度Voronoi多面体建模方法和离散元素方法。此外，建立了具有不同嵌入晶粒尺寸分布特征的数值模型，从而可以详细阐明分布参数对机械性能的影响。结果表明，岩盐的宏观力学行为是由晶粒的物理力学性能和晶界同时决定的。此外，基于数值模型的仿真结果表明，岩盐的强度和延展性受平均直径，非均质性指数和偏度系数的影响。建立了具有不同嵌入晶粒尺寸分布特征的数值模型，从而可以详细阐明分布参数对机械性能的影响。结果表明，岩盐的宏观力学行为是由晶粒的物理力学性能和晶界同时决定的。另外，基于数值模型的仿真结果表明，岩盐的强度和延展性受平均直径，非均质性指数和偏度系数的影响。建立了具有不同嵌入晶粒尺寸分布特征的数值模型，从而可以详细阐明分布参数对机械性能的影响。结果表明，岩盐的宏观力学行为是由晶粒的物理力学性能和晶界同时决定的。另外，基于数值模型的仿真结果表明，岩盐的强度和延展性受平均直径，非均质性指数和偏度系数的影响。结果表明，岩盐的宏观力学行为是由晶粒的物理力学性能和晶界同时决定的。另外，基于数值模型的仿真结果表明，岩盐的强度和延展性受平均直径，非均质性指数和偏度系数的影响。结果表明，岩盐的宏观力学行为是由晶粒的物理力学性能和晶界同时决定的。另外，基于数值模型的仿真结果表明，岩盐的强度和延展性受平均直径，非均质性指数和偏度系数的影响。