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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。
A similar material simulation experiment method was used. The brittle materials were prepared according to the similar material ratio using the uniaxial loading system and the digital speckle photometry technique. Similar tests were conducted on the standard test blocks and 3D roadway models. The analysis of similar simulation results shows that it is feasible to simulate the process of rockburst in laboratory by using brittle materials to simulate the roadway destruction under impact pressure, and the characteristics of impact failure are obvious. The results of speckle calculation show that the displacement and strain change of test blocks and the emergence, Similar to the simulation results, it is also shown that the roof of the roadway is affected by the impact and the sinking displacement is large, the internal bending deformation of the roadway on both sides of the roadway is also large, and even coal thrown and Roadway collapse. This test also provides a new way for further revealing the impact damage law of coal rock roadway.