Analysis of Mechanical Properties and Energy Evolution of Through-Double-Joint Sandy Slate Under Three-Axis Loading and Unloading Conditions

作者：Yang Wang, Chuanxin Rong, Hao Shi, Zhensen Wang, Yongping Li, Runze Zhang · 发表于：Applied Sciences · 年份：2025 · DOI：10.3390/app15179570 · 被引用次数：1 · 研究领域：Rock Mechanics and Modeling、Geotechnical and Geomechanical Engineering、Geotechnical Engineering and Analysis

In the mining of deep mineral resources and tunnel engineering, the degradation of mechanical properties and the evolution of energy of through-double-joint sandy slate under triaxial loading and unloading conditions are key scientific issues affecting the stability design of the project. The existing research has insufficiently explored the joint inclination angle effect, damage evolution mechanism, and energy distribution characteristics of this type of rock mass under the path of increasing axial pressure and removing confining pressure. Based on this, in this study, uniaxial compression, conventional triaxial compression and increasing axial pressure, and removing confining pressure tests were conducted on four types of rock-like materials with prefabricated 0°, 30°, 60°, and 90° through-double-joint inclinations under different confining pressures. The axial stress/strain curve, failure characteristics, and energy evolution law were comprehensively analyzed, and damage variables based on dissipated energy were proposed. The test results show that the joint inclination angle significantly affects the bearing capacity of the specimen, and the peak strength shows a trend of first increasing and then decreasing with the increase in the inclination angle. In terms of failure modes, the specimens under conventional triaxial compression exhibit progressive compression/shear failure (accompanied by rock bridge fracture zones), while under increased axial compression and relief o...