煤岩巷道冲击破坏过程相似模拟试验研究

采用相似材料模拟试验研究方法,利用单轴加载系统和数字散斑光测技术,根据相似材料配比制备脆性材料,对标准试块和三维巷道模型进行了相似试验研究。对相似模拟试验结果分析可知,实验室制备脆性材料模拟冲击地压巷道破坏过程是可行的,冲击破坏特征较明显;散斑计算结果说明,试块位移和应变变化与裂缝出现、扩展和贯通具有一致性,且竖向裂缝开展数量多、速度快;相似模拟试验结果也表明巷道顶板受冲击作用和下沉位移较大,两边帮向巷道内部弯曲变形也较大,甚至出现煤岩抛出和巷道垮塌。本试验也为进一步揭示煤岩巷道冲击破坏规律提供了新的途径。

Similar Simulation Experimental Study of Impact Failure Process of Coal Roadway

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.