特厚煤层坚硬顶板综放开采矿压特征及覆岩破断规律研究  

Study on Ground Pressure Characteristics and Overburden Breaking Law in Fuly Mechanized Top-coal Caving Mining with Hard Roof in Extra-thick Coal Seam

作　　者：李硕森 贺雄 徐青云[1] 冯剑 LI Shuosen;HE Xiong;XU Qingyun;FENG Jian(College of Coal Engineering,Shanxi Datong University,Datong037003,China)

机构地区：[1]山西大同大学煤炭工程学院,山西大同037003

出　　处：《煤》2024年第2期28-32,共5页Coal

基　　金：山西大同大学2022年研究生教育创新项目(22CX37)。

摘　　要：同忻煤矿主采石炭系3-5号煤层,平均煤厚约为15 m,其顶板主要由砂岩和砾岩组成的坚硬顶板。上部侏罗系内赋存有四层煤层,大部分已被开采,在坚硬顶板和煤层群遗留煤柱条件下,工作面回采期间矿压显现强烈。通过对同忻煤矿8309工作面现场矿压监测,分析工作面支架循环末阻力,得到工作面初次来压步距为70~75 m,周期来压步距为10.69~44.36 m,来压期间最大工作面阻力为15873.15 kN.利用3DEC数值模拟软件对8311工作面回采过程中上覆岩层的运动规律进行模拟,随着工作面向前推进,工作面逐渐呈现“下位悬臂梁与上位砌体梁”结构,得到了上覆坚硬顶板破断、失稳、垮落的特征规律。为具有类似条件的综放工作面回采提供可靠参考。Tongxin Coal Mine main mining carboniferous 3-5 coal seam,the average coal thickness of about 15 m,its roof is mainly composed of sandstone and conglomerate hard roof.There are four coal seams in Upper Jurassic,most of which have been mined.Under the condition of hard roof and coal pillar left in coal seam group,the ground pressure appears strongly during mining.Through the on-site ground pressure monitoring of 8309 face in Tongxin Coal Mine and the analysis of the end resistance of the support cycle in the face,it is found that the initial pressure interval of the face is about 70~75 m,and the periodic pressure interval is 10.69~44.36 m,the maximum resistance of working face is 15873.15 kN.By using 3DEC numerical simulation software,the movement law of overlying strata in the mining process of 8311 working face is simulated.As the working face advances,the working face gradually presents the structure of"lower cantilever beam and upper masonry beam",the characteristic laws of breakage,instability and collapse of overlying hard roof are obtained.It can provide reliable reference for fully mechanized top coal caving face with similar conditions.

关 键 词：坚硬顶板 矿压显现 矿压监测 破断失稳 

分 类 号：TD327.2[矿业工程—矿井建设]