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深部煤层底板破坏特征分析 被引量:1

Failure characteristics analysis of deep coal seam floor
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摘要 为研究深部煤层底板破坏特征,结合74组华北型石炭二叠系煤层底板破坏深度实测数据,通过构建的数学模型分析深部煤层底板破坏规律与浅部的差异性,确定出深浅部煤层底板破坏规律的分界点。在此基础上,运用灰色关联分析法对比分析了深浅部煤层底板破坏深度主控因素的影响权重顺序,从煤层底板采动应力变化的角度探索深部煤层底板的破坏机理。研究表明:埋深介于416~442 m之间时,深浅部煤层底板破坏规律的相关系数较小,即浅部煤层底板破坏规律与深部煤层底板破坏规律差距较大;而偏离此区间时,相关系数则增大。浅部煤层底板破坏深度受工作面开采尺寸的影响较大,而深部煤层底板由于采动应力较大的变化幅度,增加了煤层底板卸荷破坏的可能性,导致深部煤层底板破坏深度受埋深的影响较大。 In order to analyze failure law in the deep coal seam floor, using 74 groups of Carboniferous Permian coal seam floor damage depth measured data, the differences between the deep coal seam floor fracture regularity and the shallow coal seam floor fracture regularity were analyzed by the mathematical analyses. The demarcation point of the deep coal seam floor’s fracture regularity and shallow coal seam floor’s fracture regularity was defined. Based on such results, the weight of controlling factors on failure depth in a deep coal seam floor and shallow coal seam floor were analyzed by using the grey correlation analysis. The orders of controlling factors on failure depth deep coal seam floor and shallow coal seam floor were obtained. The mechanism of deep coal seam floor failure law was explored from the coal seam floor mining stress variation. The result showed that the correlation coefficient between the deep coal seam floor’s fracture regularity and shallow coal seam floor’s fracture regularity was smaller with the burial depth from 416 m to 442 m. Otherwise, the correlation coefficient was lager. The mining scale of working face had remarkable influence on shallow coal seam floor failure depth. The possibility of coal seam floor corruption was increased by the larger range of mining stress variation of deep coal seam floor. The buried depth had great influence on deep coal seam floor failure depth.
作者 张风达 申宝宏 ZHANG Fengda;SHEN Baohong(Strategic Planning Research Institute,China Coal Research Institute,Beijing 100013,China;School of Resource and Safety Engineering,China University of Mining & Technology (Beijing),Beijing 100083,China)
出处 《采矿与安全工程学报》 EI CSCD 北大核心 2019年第1期44-50,共7页 Journal of Mining & Safety Engineering
基金 国家自然科学基金项目(51704158) 中煤科工集团青年创新基金项目(2014QN005).
关键词 增广矩阵 煤层底板 分界点 仿真计算 灰色关联分析 断裂力学 augmented matrix coal seam floor demarcation point simulation calculation grey correlation analysis fracture mechanics
作者简介 张风达(1988-),男,河南省鹤壁市人,助理研究员,博士,从事承压水体上安全采煤方面的研究。E-mail: fdzhang123@126.com Tel:010-84262896.
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