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近距离下位煤层采场矿压与瓦斯防治研究
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摘要
为解决近距离煤层下行开采中下位煤层采场矿压规律与瓦斯防治的难题,本文进行了以近距离煤层为研究对象的下位煤层采场矿压规律和瓦斯运移与防治措施研究。针对以上两个研究内容,对现场煤岩样进行力学性质测定,再通过数值模拟方法分析了不同宽度残留区段煤柱对底板的影响,确定了煤柱合理宽度,在此基础上通过相似模拟实验研究了近距离煤层开采的覆岩移动规律,数值模拟分析了近距离下位煤层采场在煤柱与采空区范围内的顶板稳定性,得出合理的顶板支护参数,进行了下位煤层矿压观测;深入研究了近距离下位煤层采场瓦斯来源、抽放原理及运移规律。在此基础上在乌达矿区五虎山矿设计实施了下位煤层采场薄层破碎顶板的合理加固控制方案和采场瓦斯防治方案,取得了良好的社会经济效益。
In order to solve the problem of rock pressure law and gas prevention of the lower coal seam stope in the downward-mining of close coal seam, the mine pressure regulation and gas migration and prevention of the lower coal seam in closed distance seam were studied in this thesis. For the above two studies, on one hand, firstly, it determined the mechanical properties of coal and rock samples on-site; secondly, a reasonable pillar width was obtained by analysising the floor affected by residue coal pillars with different width through numerical simulation; finally, so as to obtain the reasonable parameters of roof support, it also studied the strata movement when close distance coal seam was mining in a physical simulation experiment, and the roof stability of the close lower seam mining field in the range of the coal pillar and goaf by numerical simulation, and then, the mine presure law in the lower coal seam was drown by field mine pressure observation and data analysis. On the other hand, gas source, gas drainage principles and migration law in the close lower coal seam mining field were also studied. On this basis, a reasionable program of reinforcement controls for the thin-layer broken roof and the gas prevention in the lower coal mine field was designed and implemented in the Wuda Coalfield Wuhushan mine, which has brought good social and economic benefits.
引文
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