厚松散层薄基岩浅埋煤层突水溃砂的可能性分析  

Possibility Analysis of Water and Sand Inrush at Shallow Buried Coal Seam with Unconsolidated Formation and Thin Bedrock

作　　者：连会青[1,2] 夏向学[2] 冉伟[2] 晏涛[2] 

机构地区：[1]中国矿业大学(北京),北京1000831 [2]华北科技学院,河北三河065201

出　　处：《煤矿安全》2015年第2期168-171,共4页Safety in Coal Mines

基　　金：河北省自然科学基金资助项目(E2013508123);"十二五"国家科技支撑计划资助项目(2012BAK04B04);教育部新世纪优秀人才支持计划资助项目(NCET-11-0838);国家重点基础研究发展计划(973计划)资助项目(2013CB227903)

摘　　要：以石圪台矿22304工作面为例,从厚松散含水层、薄基岩浅埋煤层开采时存在的突水溃砂问题入手、分析影响突水溃砂的4个影响因素、以现场监测、室内流固耦合相似模拟和水动力学等为主要研究手段,分析采区的特定的地质条件,研究煤层采动覆岩来压的规律,薄基岩破坏规律及研究水砂运移的动力机制,并给出突水溃砂临界水头高度及安全水头的计算和判定依据;得出了工作面的临界采宽是52.7 m,老顶首次来压计算步距50-79 m,周期来压步距16~19m。临界水力坡度为1.251、临界水头高度为13.54 m、实际水力坡度为3.25、实际水力坡度大于临界水力坡度,分析研究区在初始状态下有突水溃砂危险。Taking 22304 face of Shigetai Mine as an example,we analyze four impact factors affecting water and sand inrush at shallow buried coal seam with thick unconsolidated fomation and thin bedrock during mining.By means of field monitoring,indoor flow-solid coupling simulation experiment,hydrodynamics techniques,we study and analyze the specific geological condition,the pressure law caused by mining,the breaking law of thin bedrock and dynamic mechanism of runoff and sediment transport,then give the critical head and computing and judging basis of safety critical head.After observing analysis and theoretical calculation,we study mine pressure law of working face,concluded that the critical width is 52.7 m,the step distance of old top pressure for the first time is 50 to 79 m,periodic weighting step ranges from 16 to 19 m.The calculated critical water power gradient is 1.251,the critical height is 13.54 m,the actual hydraulic gradient is 3.25,we can conclude that the segment have risks of water and sand inrush.

关 键 词：薄基岩 顶板突水溃砂 浅埋煤层 覆岩运移 临界水头 

分 类 号：TD741[矿业工程—矿井通风与安全]