W1143综采工作面冲击地压发生机理分析
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摘要
为了研究W1143工作面冲击地压发生的机理,采用实验室试验、数值模拟、微震监测等手段,针对影响冲击地压发生的地质因素和开采技术因素进行分析。研究表明,W1143工作面煤层具有强冲击倾向性,煤层顶板为坚硬的砂岩,工作面应力场以水平构造应力为主,煤壁的夹矸易造成工作面局部煤体应力集中。地质因素是W1143工作面冲击地压发生的基本条件,开采技术因素是W1143工作面冲击地压发生的外部条件,区段大煤柱布置开采容易造成W1143工作面局部应力集中,在工作面过快的推进速度及不合理的工作面支护状态触发下,就可能发生冲击地压,最终通过在冲击地压发生原因分析的基础上,得到了W1143工作面冲击地压发生机理。
In order to study the occurrence mechanism of rock burst on W1143 mining face, analysis focus on factors concerning geology and f mining technology that influence the occurrence of rock burst has been done with the means of laboratory tests, numerical simulation and microseismic monitoring. It is showed that the coal seam of W1143 mining face has great impact tendency, the composition of the roof of coal seam is hard sandstone, the principal stress field of the mining face should be horizontal tectonic stress, and the dirt band of coal wall can easily cause stress concentration of partial coal on the mining face. The geologic factors are the basic conditions that cause the occurrence of rock burst on W1143 mining face, while mining technology factors are the external conditions. As big pillar layout mining in a section can easily cause partial stress concentration on W1143 mining face, overly quick promoting speed and unreasonable supporting status on the mining face may touch out the occurrence of rock burst. The occurrence mechanism of rock burst on W1143 mining face has been finally got upon analyzing the causes of rock burst.
In order to study the occurrence mechanism of rock burst on W1143 mining face, analysis focus on factors concerning geology and f mining technology that influence the occurrence of rock burst has been done with the means of laboratory tests, numerical simulation and microseismic monitoring. It is showed that the coal seam of W1143 mining face has great impact tendency, the composition of the roof of coal seam is hard sandstone, the principal stress field of the mining face should be horizontal tectonic stress, and the dirt band of coal wall can easily cause stress concentration of partial coal on the mining face. The geologic factors are the basic conditions that cause the occurrence of rock burst on W1143 mining face, while mining technology factors are the external conditions. As big pillar layout mining in a section can easily cause partial stress concentration on W1143 mining face, overly quick promoting speed and unreasonable supporting status on the mining face may touch out the occurrence of rock burst. The occurrence mechanism of rock burst on W1143 mining face has been finally got upon analyzing the causes of rock burst.
引文
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[3]窦林名,赵从国,杨思光,吴兴荣.煤矿开采冲击矿压灾害防治[M].徐州:中国矿业大学出版社,2006.
[4]牟宗龙,窦林名,张广文,等.坚硬顶板型冲击矿压灾害防治研究[J].中国矿业大学学报,2006,35(6):738-741.
[5]靳钟铭,徐林生.煤矿坚硬顶板控制[M].煤炭工业出版社,1994.
[6]姜福兴,XUN Luo,杨淑华.采场覆岩空间破裂与采动应力场的微震探测研究[J].岩土工程学报,2003,25(1):23-25.
[7]姜福兴,杨淑华,XUN Luo.微地震监测揭示的采场围岩空间破裂形态[J].煤炭学报,2003,28(4):357-360.
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