循环加卸载下花岗岩能量演化及分配规律

为探究岩石损伤破坏过程中的能量演化及分配规律，以焦家矿区花岗岩为研究对象，利用ZTR-276三轴应力试验系统进行三轴循环加卸载试验，。研究结果表明：循环加卸载试验过程中，花岗岩的应力峰值和轴向应变量随着围压增加逐渐增大，表现出明显的围压效应；循环加卸载试验下，总能量密度，弹性能密度和耗散能密度在峰前阶段均与轴向应变呈正相关关系；随着围压增大，岩石储能效率增加，最大弹性能占比增大，最大耗散能占比却随着围压的增大而降低。研究结果可为循环扰动条件下深部巷道围岩损伤破坏失稳提供理论指导意义。

Energy evolution and distribution law of granite under cyclic loading and unloading

In order to explore the energy evolution and energy distribution law during the process of rock damage and failure, taking granite in Jiaojia mining area as the research object, the ZTR-276 triaxial stress testing system was used to carry out triaxial cyclic loading and unloading tests. The research results indicate that during the cyclic loading and unloading test, the peak stress and axial strain of granite exhibit significant confining pressure effect; In the pre-peak stage, the characteristic energy density is positively correlated with axial strain; As the confining pressure increases, the energy storage efficiency and the proportion of maximum elastic energy of the rock increase, but the maximum dissipated energy ratio decreases accordingly. The research results can provide theoretical guidance for the damage, failure, and instability of surrounding rock in deep tunnels under cyclic disturbance conditions.