STRESS WAVE PROPAGATION AND DECAY LAW AND TEST ANALYSIS OF SURROUNDING ROCK BY RIGID-FLEXIBLE COUPLING SUPPORT
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 200mm.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.