论文部分内容阅读
利用MTS 815试验机对煤岩组合体进行单轴和循环加卸载试验,研究了煤岩组合体的能量演化特征及规律。试验结果表明:输入能密度与应力关系可分为3个阶段,即缓慢增长阶段、非线性增长阶段、峰后跌落阶段;单轴压缩下输入能密度和弹性能密度均随着应力的增大而增大,耗散能密度与应力关系比较复杂,其增长率逐渐减小,并趋于0,而后迅速增大,体现出明显的非线性特征;循环加卸载下输入能密度、弹性能密度和耗散能密度随着应力的增大而增大。当试样发生屈服时,耗散能比例增加,弹性能比例降低;研究结论为煤矿动力灾害的能量驱动机制提供一定的理论参考。
The uniaxial and cyclic loading and unloading tests were carried out on the coal and rock assembly by MTS 815 testing machine to study the energy evolution characteristics and laws of the coal and rock assembly. The experimental results show that the relationship between input energy density and stress can be divided into three stages: slow growth stage, non-linear growth stage and post-peak fall stage. The input energy density and elastic energy density increase with the increase of stress under uniaxial compression However, the relationship between dissipation density and stress is rather complicated, and its growth rate decreases gradually and tends to 0, then increases rapidly and shows obvious nonlinear characteristics. Input energy density, elastic energy density And dissipated energy density increases with increasing stress. When yielding, the proportion of dissipative energy increases, and the proportion of elastic energy decreases. The research conclusion provides some theoretical references for the energy-driven mechanism of coal mine disaster.