刚柔耦合吸能支护煤岩巷道冲击破坏相似试验与数值计算对比分析

Simulation and numerical analysis of impact failure law of coal roadway under rigid-flexible energy absorbing support

冲击地压巷道支护问题一直是研究的热点。采用相似模拟试验和数值模拟的研究方法,对裸巷和刚柔吸能支护巷道的冲击破坏过程进行研究。试验和数值计算结果均表明,无支护巷道冲击变形破坏较严重,在巷道顶板和两帮壁面均出现裂缝扩展和贯通,甚至出现抛出物冲入巷道和塌落现象;刚柔吸能支护具有缓冲和吸收冲击能作用,表现为巷道顶板和两帮壁面发生向巷道内部变形,同时有局部壁面出现裂缝,但巷道整体性完好;裸巷和吸能支护巷道冲击破坏规律基本一致,吸能支护巷道冲击破坏程度弱,整体性好,刚柔耦合支护更有利于冲击地压巷道支护。

Roadway support is always the focus research of rockburst.Using similar simulation experiments and numerical simulation methods,the impact failure process of roadway under nude alley and rigid-flexible energy absorbing support is studied.Experimental and numerical results indicate that the deformation and failure without support are more serious than those with rigid-flexible coupled support.The cracks in the roof and at two side walls are extended and through,even objects are thrown into the roadway and collapse under nude alley.The rigid-flexible coupled support plays a good role in absorbing impact energy,and thus internal deformation occurs in the roof and two walls,while cracks take place in partial wall.But the roadway is good when the rigid-flexible energy absorbing support is used.The impact failure laws of coal roadway under nude alley and rigid-flexible coupled support are similar.The results also show that energy absorbing support has advantages of weak impact damage and good integrality,and the rigid-flexible coupled support is better for rockburst roadway.