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采用理论分析、物理相似模拟及现场实测相结合的方法,对坚硬厚层顶板群结构的破断冲击效应进行了分析.研究表明:多分层坚硬顶板群结构的破断冲击载荷在短时间内会产生较大的波动,工作面来压特征受多分层顶板垮断的联合作用;采场冲击来压强度主要与顶板赋存厚度及自身岩性特征有关,对于岩性相近的顶板岩层,厚度越大,对采场的矿压冲击影响也越剧烈,但厚层顶板垮断后的结构对其上覆顶板岩层的冲击载荷强度具有一定的缓冲.以大同矿区坚硬顶板群结构下的煤层开采为例,现场实测分析得到的工作面采场来压特征说明多分层顶板的垮断失稳有一定的随机性,但各分层顶板的单层垮断或多层同步垮断几率在整个煤层开采过程中基本保持不变.
The breaking impact effect of the hard and thick roof group structure is analyzed with the method of theoretical analysis, physical similarity simulation and field measurement.The results show that the breaking impact load of the multi-layered hard roof group structure will be generated in a short time The larger the fluctuation and the pressure of the face, the multi-layered roof collapses; the impact strength of the stope is mainly related to the thickness of the top plate and its own lithology. For the roof rock with similar lithology, the thickness Large, the impact of stope pressure on the stope is more dramatic, but the structure after the collapse of thick roof has a certain buffer to the impact load strength of the overlying roof rock strata.With the coal seam mining under the hard roof group in Datong mine as an example The analysis of stope pressure in working face shows that there is a certain randomness in the failure of multi-layered roof. However, the probability of single-layer collapse or multi-layer collapse of multi-layered roof varies with the coal seam mining The process remained basically unchanged.