刚-柔耦合支护巷道围岩应力波传播和衰减规律及试验分析

STRESS WAVE PROPAGATION AND DECAY LAW AND TEST ANALYSIS OF SURROUNDING ROCK BY RIGID-FLEXIBLE COUPLING SUPPORT

支护巷道围岩冲击破坏及防治一直是采矿工程中难以解决的问题。对冲击应力波在支护巷道中的传播和衰减过程进行分析,分别得到了冲击应力波作用巷道围岩、刚性支护巷道和刚-柔耦合支护巷道发生破坏的应力判据和能量条件。采用低能爆炸加载方式,利用高速数据采集方法(数字散斑观测),对炮孔距离巷道顶部为200mm,硝铵炸药量为6.0g条件下裸巷和刚-柔耦合支护巷道冲击破坏过程进行监测,得到了裸巷和刚-柔耦合支护巷道表面散斑场变形破坏特征。试验结果说明了刚-柔耦合支护可有效缓冲动态载荷、吸收冲击能量,也为防治巷道冲击破坏提供了一种新方法。

Impact damage and prevention of surrounding rock are always the difficult problem to solve in mining engineering. By the analysis on stress wave propagation and decay law of surrounding rock supported by a rigid-flexible coupling support, the stress criterion and energy conditions of roadway destruction under a naked lane, rigid support roadway and rigid-flexible coupling support roadway by impact wave are received. Using a digital speckle correlation method （DSCM）, the impact failure process of a naked lane and rigid-flexible coupling support roadway by a low-energy explosive load is monitored under the condition of explosive quantity 6.0g, blast hole distance of 200ram. the deformation and failure roadway speckle field test results show that a rigid-flexible coupling support can effectively buffer dynamic loads, absorb impact energy, and provide a new method for prevention roadway destructions.