论文部分内容阅读
采用静载模拟巷道初始地应力场,TNT爆炸模拟冲击地压,利用大型地质力学模型试验机对巷道在动、静荷载联合作用下的响应规律进行研究。试验中施加了相当于相似材料单轴抗压强度的最大静压力,荷载侧压比为1/3。在模型内部相同位置依次施加10,15和20 g TNT动荷载,在最后一次爆炸荷载作用下,洞室出现抛掷型冲击地压破坏现象。试验结果表明:巷道冲击地压灾害是动、静荷载联合作用的结果;在冲击瞬间作用下,冲击荷载与已存在静荷载叠加,使得巷道围岩压力迅速增加,叠加后作用力大于围岩承载能力时,引发围岩冲击破坏;围岩产生的冲击变形与巷道开挖后产生的初始变形叠加,形变超出围岩的变形能力时,洞壁首先发生破坏。围岩变形和冲击破坏范围与冲击力的大小及地应力水平相关性显著。
The initial ground stress field of the roadway was simulated by static load and the TNT explosion was used to simulate the rock burst. The response of the roadway under dynamic and static load was studied by using large geomechanical model test machine. The maximum static pressure equivalent to the uniaxial compressive strength of similar materials was applied during the test with a load side pressure ratio of 1/3. At the same position inside the model, 10, 15 and 20 g TNT dynamic loads were applied one after the other, and under the effect of the last explosion load, the trenching chamber was damaged by throwing rockets. The test results show that the roadway rock burst is the result of joint action of static and dynamic loads. Under the action of impact moment, the impact load and the existing static load are superposed, so the pressure of surrounding rock in the roadway increases rapidly, Ability, triggering the impact of surrounding rock damage; impact deformation generated by surrounding rock superimposed on the initial deformation after excavation, deformation beyond the deformation capacity of the surrounding rock, the first wall damage occurred. The deformation and impact damage range of surrounding rock have a significant correlation with the size of impact force and the level of in-situ stress.