【摘要】 冲击地压瞬时释放大量积聚能量,造成巷道严重破坏,直接影响煤矿安全生产。利用爆炸加载相似模拟试验和数字散斑观测方法(DSCM),研究高速冲击载荷作用下巷道动态破坏过程。试验结果表明,高速冲击波以巷道方向传递为主,顶板处变形较大,顶板岩层与煤岩体交界处发生错动,上部岩层明显下沉,顶板岩层受拉剪破坏,裂缝逐渐发育延伸至巷道;冲击波重复作用致使顶板岩体破碎,进而造成巷道局部破坏或垮塌。数字散斑观测结果说明,在高速冲击载荷作用下,顶板产生下沉位移约为4 mm,进而冲击波向两帮传播,岩层破碎后沿表面剥离脱落,表现为散斑计算结果云图中出现白色空白区。更多还原

【Abstract】 Rock burst which releasing large quantity energy,may damage the roadway severely and reduce the safety of the production of coal mine.Using similarity simulation experiment under explosive loading and the digital speckle correlation method(DSCM),the dynamic failure process of roadway under high velocity impact loading is simulated.The results show that the impact wave is mainly in roadway direction and the deformation of the roof is obvious.At the same time,the roof has a cutting rupture and a displacement between coal body and upper roadway.The roof has a tension-shear rupture,and also the crack extends to roadway gradually.Roof broken or partial collapsing area appeared under the repeat impact loads.Digital speckle pattern observations show that the sinking displacement of roof about 4mm under impact load.And then the impact wave spreads to two sides of the roadway.The rock drops along the surface after broken.It assumes that the blank white space appears on the speckle patterns.更多还原