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中文摘要：
文章采用力学模型定量分析了引起火成岩破断的采空区宽度;并采用FLAC5.0数值模拟软件分析了Ⅱ102采区工作面回采后垂直应力的分布情况。根据数值模拟结果得出：Ⅱ1022、Ⅱ1024两个工作面回采后火成岩已经成为承载主体但尚未破断;Ⅱ1026工作面回采完毕时,火成岩已经失稳,高应力状态下的火成岩在外力扰动下随时可能发生破断。通过分析矿震分布特征发现：火成岩内部及其上方岩层矿震分布极少,说明Ⅱ1024工作面回采后,火成岩没有破断且是稳定的;火成岩下部的岩层活动相对剧烈,说明火成岩成为承载主体后,火成岩与下部岩层出现离层;巨厚火成岩成为Ⅱ102采区主关键层,控制了火成岩上方的岩层运动,因此矿震分布主要在火成岩下部层位。通过分析矿震的分布特征,可以为监测火成岩的稳定状态提供理论依据。
英文摘要：
The mechanics model was applied to quantitatively analyze the goaf width to cause the broken of the igneous rock.The FLAC5.0 nuerical simulation software was applied to analyze the vertical stress distribution conditions after the mining operation of the II 102 Coal mining face.The numerical simulation results showed that the igneous rock roof in the II 1022 and Ⅱ1024 coal mining faces after the mining operations would become the main support mass and there was no broken occurred in the roof.After the mining operation of the II 1026 coal mining face,the igneous rock roof lost the stability and under the high stress condition,the igneous rock with the outer dynamic interferences would be broken at any time.The analysis on the mine seismic distribution features showed that there was less mine seismic distribution in the inner and top strata of the igneous rocks and after the mining operation of the II 1024 coal mining face,the igneous rock was not broken and but in stable.There were relevant serious activities in the strata below the igneous rocks and there was a parting between the igneous rock and the strata below the igneous rock.The ultra thick igneous rock was the main key stratum of the II 102 mining block and controlled the movement of the strata above the igneous rock.Therefore the mine seismic distribution mainly distributed the strata below the igneous rock.The analysis on the mine seismic distribution features could provide the theoretical references to monitor and measure the stability status of the igneous rock.
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