厚松散层薄基岩下分层开采覆岩破坏高度研究  

Failure height of overlying strata in lower slice mining under thick alluvium and thin bedrock

作　　者：王文卫 芦晓伟 丁坤朋 王文[4] WANG Wenwei;LU Xiaowei;DING Kunpeng;WANG Wen(Jiaozuo Coal Industry Group Zhaogu(Xinxiang)Energy Co.,Ltd.,Xinxiang 453000,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China;Henan Institute of Industrial Technology Co.,Ltd.,Jiaozuo 454000,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]焦作煤业集团赵固(新乡)能源有限责任公司,河南新乡453000 [2]中国矿业大学安全工程学院,江苏徐州221116 [3]河南理工产业技术研究院有限公司,河南焦作454000 [4]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《煤炭工程》2024年第5期75-83,共9页Coal Engineering

基　　金：国家自然科学基金项目(52174109);河南省高校科技创新人才支持计划(23HASTIT011);安全学科“双一流”创建工程入库项目(AQ20230501)

摘　　要：以赵固一矿厚松散层薄基岩下分层工作面为研究对象,采用理论分析、数值模拟研究、钻孔冲洗液漏失量观测及钻孔窥视方法对采后覆岩破坏高度进行研究,研究表明:采用经验公式计算得到下分层工作面采后,顶板垮落带发育高度为6.93~27.72 m,导水裂缝带发育高度为22.17~71.73 m;数值模拟结果表明下分层采高2.5 m、累计采高6 m时,最大垮采比为2.61,而累计采厚小于6 m、基岩厚度不小于30 m、黏土层厚度大于5 m时可认为黏土层厚度能够阻隔导水裂缝带向上发育;采用现场实测方法得到累计采厚5.8 m处,垮落带15.26 m,垮采比为2.62,导水裂缝带55.59 m,裂采比为9.58。东一盘区下分层工作面后开采覆岩破坏高度的规律,可以为该矿下分层工作面时确定防水、防砂安全煤(岩)柱厚度提供理论依据。In order to study the failure height of overlying strata after mining in the lower slice working face under thick alluvium and thin bedrock in Zhaogu No.1 Mine,theoretical analysis,numerical simulation,borehole flushing fluid leakage observation and borehole peeping method were used.According to the empirical formula calculation,the development height of falling zone is 6.93~27.72 m and the development height of water conducted zone is 22.17~71.73 m after lower slice mining.The numerical simulation results show that,when the mining height of the lower slice is 2.5 m and the cumulative mining height is 6 m,the maximum caving-height ratio is 2.61.When the cumulative mining thickness is less than 6 m and the bedrock thickness is no less than 30 m,and the clay layer thickness is greater than 5 m,it can be considered that the clay layer thickness can block the upward development of the water conducted zone.According to the field measurement,when the cumulative mining thickness is 5.8 m,the falling zone is 15.26 m,the caving-height ratio is 2.62,the water conducted zone is 55.59 m,and the fracture ratio is 9.58.The law of the failure height of the overlying strata after the lower slice mining can provide a theoretical basis for determining the thickness of safety coal(rock)pillar of waterproof and sand control.

关 键 词：厚松散层 薄基岩 垮落带 导水裂隙带 下分层 

分 类 号：TD325[矿业工程—矿井建设]