Similar Simulation Experimental Study of Impact Failure Process of Coal Roadway
煤岩巷道冲击破坏过程相似模拟试验研究

Similar simulation experimental study of a standard test block and a three-dimensional coal roadway model made of brittle materials by the similar material ratio was carried out based on uniaxial loading system and digital speckle pattern measurement technology. The impact failure process of coal roadway was discussed. Results show that similar simulation for the impact failure process of roadway model made of brittle material in laboratory is feasible, and the impact failure characteristics are evident. Speckle results show that the model displacement and strain variation are consistent with the emergence, expansion and transfixion of cracks , and a large number of vertical crack appears fast. Experimental results also indicate that the roadway roof subsides a large displacement due to the intense impact loading, and the both sides of roadway present a large internal deformation, even the coal and rock are thrown out and roadway is collapsed. This study also provides a new method for further revealing the impact failure of rockburst.