厚松散层浅埋煤层开采地表下沉影响因素分析
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摘要
为研究影响厚松散层浅埋煤层开采地表下沉的主要因素,应用正交实验法,借助数值模拟研究结果,对基岩厚度、松散层厚度及开采厚度3个因素进行影响程度排序。结果表明:基岩厚度是地表下沉的主要控制因素,在此基础上分析得出基载比和基采比是判定地表下沉及覆岩破坏程度的关键因素。通过回归分析拟合给出地表最大下沉值及地表下沉系数与影响因素的综合函数表达式,应用工程实例予以验证,结果表明函数表达式具有较高可信度。
To study the main factors affecting the surface subsidence in shallow seam mining with thick unconsolidated strata, the orthogonal experiment method was used to rank the influencing degree of the three factors: bedrock thickness, unconsolidated strata thickness and mining thickness. The results show that bedrock thickness is the main controlling factor of the surface subsidence. It is concluded that ratio of bedrock thickness and mining height and ratio of bedrock thickness and overburden thickness are the key factors to determine the degree of surface subsidence and overburden failure. The comprehensive function expressions of the maximum subsidence value, coefficient of subsidence and influencing factors are given by regression analysis and fitting. The results are verified by engineering examples. The results show that the function expressions have high reliability.
To study the main factors affecting the surface subsidence in shallow seam mining with thick unconsolidated strata, the orthogonal experiment method was used to rank the influencing degree of the three factors: bedrock thickness, unconsolidated strata thickness and mining thickness. The results show that bedrock thickness is the main controlling factor of the surface subsidence. It is concluded that ratio of bedrock thickness and mining height and ratio of bedrock thickness and overburden thickness are the key factors to determine the degree of surface subsidence and overburden failure. The comprehensive function expressions of the maximum subsidence value, coefficient of subsidence and influencing factors are given by regression analysis and fitting. The results are verified by engineering examples. The results show that the function expressions have high reliability.
引文
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[3]梁冰,汪北方,姜利国,等.浅埋采空区垮落岩体碎胀特性研究[J].中国矿业大学学报,2016,45(3):476.
[4]赵雁海,宋选民.浅埋超长工作面裂隙梁铰拱结构稳定性分析及数值模拟研究[J].岩土力学,2016,37(1):204-209.
[5]陈盼,谷拴成,张幼振.浅埋煤层垂向重复采动下地表移动规律实测研究[J].煤炭科学技术,2016,44(11):173-177.
[6]黄庆享,杜君武.浅埋煤层群开采的区段煤柱应力与地表裂缝耦合控制研究[J].煤炭学报,2018,43(3):592-598.
[7]张文泉,刘海林,赵凯,等.厚松散层薄基岩条带开采地表沉陷影响因素研究[J].采矿与安全工程学报,2016,33(6):1065-1071.
[8]汤铸,李树清,黄寿卿,等.厚松散层矿区综放开采地表移动变形规律[J].煤矿安全,2018,49(6):210.
[9]叶金胜,经来旺,崔磊,等.岩体剪胀对巷道围岩塑性区位移的影响分析[J].煤矿安全,2018,49(5):194.
[10]刘义新.我国浅埋煤层快速开采下地表沉陷规律研究现状与展望[J].煤矿安全,2018,49(4):205-207.
[11]西安科技大学.韩家湾煤矿2304工作面开采地表与岩层移动规律研究报告[R].西安:西安科技大学,2010.