Multi-scale damage experiments and constitutive studies of rocks with different mineral compositions under high temperature effects

作者：Youliang Chen, Yun-Gui Pan, Xi Du, Lijing Shao, Wencan Guan, Yu-Fei Tang, Guanlin Liu, Rafig Azzam, Tomás Manuel Fernández-Steeger · 发表于：Results in Engineering · 年份：2025 · DOI：10.1016/j.rineng.2025.105734 · 被引用次数：7 · 研究领域：Rock Mechanics and Modeling、High-Velocity Impact and Material Behavior、High-pressure geophysics and materials

This study investigates the multi-scale damage characteristics of rocks with varying mineral compositions under high temperatures, covering the effects of thermal expansion, phase transformation, thermal decomposition, and chemical reactions of rock minerals on macro-mechanical properties. Using XRD and SEM data, a sub-microscopic initial damage coefficient was defined. A full-stage sub-microscopic damage constitutive model ( FSDC ) was built with this coefficient as the damage variable, reflecting the mechanical and damage evolution characteristics of rocks at different stages. Results show that granite, rich in feldspar, is mainly affected by thermally induced internal mineral damage from thermal stress, while sandstone, rich in quartz, is predominantly influenced by reduced effective contact between rock minerals due to temperature changes. Furthermore, experimental validation of the FSDC model confirms that its parameters accurately reflect the physical and mechanical properties of rocks, offering theoretical support for the application of rock materials in high-temperature environments.