Research on the Elastic Properties of Deep Rock Composites Under High Pressure

Abstract

This paper presents a three-dimensional model of the definitive structure of gypsum, calcite and quartz crystals, which are the primary components of deep rock mass. The optimization of the primary components of deep rock mass material was performed under pressures ranging from 0 to 120 MPa using the first principles method. This led to the determination of the structural constants of the primary component crystals within the deep rock material. Furthermore, the variation rule of mechanical parameters, including elastic constants, for the primary components of deep-seated rock materials under different pressures was also investigated. The findings indicate a clear downward trend in the partial crystal structure parameters of deep-seated rock materials with increasing pressure. The primary components of each rock mass material display disparate compressibility properties in distinct directions when subjected to uniaxial compression. In conclusion, the anisotropic elastic properties of gypsum crystals, calcite crystals and quartz crystals under different pressures were investigated. The anisotropic cloud diagrams of bulk modulus, elastic modulus and shear modulus were presented for the three types of rock material at 0 MPa, 60 MPa and 120 MPa, respectively. In conclusion, we derived the theoretical equations for the elastic tensor matrix of composite materials using the principle of superposition. Furthermore, we studied and obtained the elastic tensor matrix for composite materials within the deep rock mass. These results provide essential theoretical guidance for the development of underground space and the analysis of deep rock dynamics.