超长综采工作面矿压显现规律研究  

Study on Underground Pressure Manifestation Law of Ultra-long Fully-mechanized Working Face

作　　者：陈杰 任金武 辛亚军[2] CHEN Jie;REN Jinwu;XIN Yajun(Yonghua Energy Co.,Ltd.,Henan Energy and Chemical Industry Group Co.,Ltd.,Luoyang 471000,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南能源化工集团永华能源有限公司,河南洛阳471000 [2]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《煤炭技术》2022年第10期10-14,共5页Coal Technology

基　　金：国家自然科学基金资助项目(51374091);深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放基金项目(SJF201801)。

摘　　要：为掌握超长综采工作面矿压显现规律及发生机理,采用理论分析、数值模拟和现场观测的研究方法,对河南某矿300 m超长综采工作面矿压显现规律及发生机理进行分析。结果表明:随着工作面长度增加,采空区应力由“中间大、两端小”的上凸半圆弧形分布逐渐演化为“两端大、中间小”的马鞍形分布;10-103综采工作面基本顶初次来压步距和周期来压步距分别为23.88 m和9.75 m;工作面长度为250 m和300 m时顶板垂直应力和塑性区分布特征基本相似,但应力峰值位置由工作面前方5 m处增加至前方6 m,应力集中系数由1.57增大至1.58。现场观测表明:上部支架工作阻力多接近或超过上限,工作面出现老顶来压;下部支架工作阻力基本维持在上、下限之间,工作面来压较缓和;中部支架工作状态良好,无明显周期来压。In order to grasp the law and occurrence mechanism of the underground pressure of the ultra-long fully-mechanized working face,the research methods of theoretical analysis,numerical simulation and on-site observation were used to analyze the underground pressure manifestation law and occurrence mechanism of the 300 m ultra-long fully-mechanized working face of a mine in Henan.The results show that with the increase of the working face length,the goaf stress gradually evolves from the convex semi-circular arc distribution of"large in the middle and small at both ends"to the saddle-shaped distribution of"large at both ends and small in the middle".The 10-103 fully-mechanized working face basic top first pressure step distance and periodic pressure step distance are23.88 m and 9.75 m,respectively;when the working face length is 250 m and 300 m,the distribution characteristics of the vertical stress and plastic zone of the top plate are basically similar,but the peak stress position is increased from 5 m in front of the work to 6 m in front,and the stress concentration coefficient is increased from 1.57 to 1.58.On-site observation shows that the working resistance of the upper bracket is close to or exceeds the upper limit,and the working face appears to be pressed by the old top;the working resistance of the lower bracket is basically maintained between the upper and lower limits,and the working face is more relaxed;the central bracket works well with no significant cycles to press.

关 键 词：超长综采工作面 应力分布 矿压显现 数值模拟 支架阻力 

分 类 号：TD323[矿业工程—矿井建设]