大采高工作面煤壁稳定性分析及控制技术研究  

Research on the stability analysis and control technology of coal wall in the working face of large mining heights

作　　者：付宝杰[1] 陈晓东 FU Baojie;CHEN Xiaodong(School of Mining Engineering,Anhui University of Science and Technology,Huainan,232001,China)

机构地区：[1]安徽理工大学矿业工程学院,安徽淮南232001

出　　处：《华北科技学院学报》2023年第6期8-15,共8页Journal of North China Institute of Science and Technology

摘　　要：针对“直覆厚硬砂岩顶板破断步距大,易引发煤壁片帮等煤岩动力灾害”的情况,本文研究了张集矿以厚硬砂岩为顶板的14121工作面开采过程,结合理论分析得出煤壁片帮的影响因素,确定合理的破断步距。采取预裂爆破强制放顶方案,用UDEC软件模拟切顶效果,比较不同破断步距下预裂爆破切顶前后的煤壁处的应力集中及塑性区煤体的破坏特征。结果表明:15 m顶板破断步距相较于25 m破断步距使煤壁前方超前支承应力峰值下降20.1%,但煤壁处的承载力增加121%,煤壁水平方向最大位移量减少了35.3%,煤壁处塑性区范围减小近30%,从而减少煤壁片帮事故的发生,保证大采高工作面的安全回采。Aiming at the situation that"the large breaking step of the roof slab directly overlying thick and hard sandstone is easy to cause coal-rock dynamic disasters such as coal wall ganging",this paper studies the mining process of 14121 working face in Zhangji mine,which has thick and hard sandstone as the roof slab,and combines with theoretical analyses to find out the influencing factors of the coal wall ganging,and determines the reasonable breaking step.Adopting pre-cracking blasting to force the roof release programme,simulating the effect of roof cutting with UDEC software,comparing the stress concentration at the coal wall before and after cutting the roof by pre-cracking blasting at different breaking steps and the damage characteristics of the coal body in the plastic zone.The results show that:compared with 25m roof breaking step,15m roof breaking step makes the peak over-supporting stress in front of the coal wall decrease by 20.1%,but the bearing capacity of the coal wall increases by 121%,the maximum horizontal displacement of the coal wall decreases by 35.3%,and the range of the plastic zone of the coal wall decreases by 30%,thus reducing the occurrence of the accident of the coal wall flake gangs,and guaranteeing the safety of the large-height working face.

关 键 词：大采高 煤壁片帮 预裂爆破切顶 应力集中 

分 类 号：TD323[矿业工程—矿井建设]