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作 者:苏晓建 SU Xiaojian(Zhaogu No.2 Coal Mine,Jiaozuo Coal Industry Co.,Ltd.,Henan Energy and Chemical Industry Group,Huixian 453633,China)
机构地区:[1]河南能源化工集团焦煤公司赵固二矿,河南辉县453633
出 处:《煤炭技术》2022年第10期82-84,共3页Coal Technology
摘 要:为掌握赵固二矿第1个大采高综采工作面矿压显现规律,以11050工作面为背景,采用相似模拟和数值模拟方法研究了大采高工作面推进过程中顶板运移特征。结果表明:(1)大采高工作面初次来压步距为35 m,周期来压步距为17~19 m,开切眼处岩层移动角约为60°,在工作面推进240 m后,冒落带、裂隙带、弯曲下沉带高度分别为22、101、20 m。(2)当大采高工作面自开切眼推进30 m时,直接顶产生离层,顶板弯曲下沉并形成板或“梁”结构,作用点在煤壁前方,造成在煤壁附近的应力集中。研究成果可为矿井安全高效开采提供理论支撑。In order to master the mining pressure behavior law of the first large mining height fullymechanized working face in Zhaogu No.2 coal mine,taking 11050 working face as the background,the similar simulation and numerical simulation methods are used to study the roof movement characteristics in the process of large mining height working face advancing.The following conclusions can be drawn:(1)The first weighting step spacing of the large mining height working face is 35 m,the periodic weighting step spacing is 17-19 m,the rock movement angle of open-off cut is about 60°,and the heights of the caving zone,fracture zone and bending subsidence zone are 22 m,101 m and 20 m respectively after the working face is advanced for 240 m.(2)When the working face advance distance is 30 m from the open-off cut,layer separation is generated at the immediate roof,and forms a plate or"beam"structure because of the roof bends and sinks and.The point of action is in front of the coal wall,resulting in stress concentration near the coal wall.The research results can provide theoretical support for safe and efficient production.
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