裕兴煤矿15109工作面回风巷支护技术研究

Research on return air roadway support technology in No.15109 mining face of Yuxing Coal Mine

针对裕兴煤矿15108工作面回风巷顶板离层、两帮围岩变形破坏严重、巷道支护困难的问题,通过对15108工作面现场监测数据进行分析,研究15108工作面回采巷道围岩应力分布规律及变形破坏特征,在15108工作面回风巷支护方式基础上对相邻工作面15109回风巷锚杆支护参数进行设计、优化;通过FLAC3D数值模拟软件模拟不同支护参数下巷道应力分布特征与巷道变形量,对比分析不同方案模拟结果确定合理的支护参数。结果表明:当锚杆预紧力不变,采用方案一、二、三时回风巷围岩都得到有效控制,支护效果比较明显;当锚杆间排距不变,锚杆预紧力越大巷道顶底板变化越小,支护效果越好。考虑工程需要及支护成本确定方案三中锚杆间距为800 mm、预紧力为80 k N为最优方案。

Aiming at the problems of serious deformation and destruction of the surrounding rock and difficult roadway support for the roof leaving layer and the two-rib surrounding rock of the working face of the Yu Xing No.15108 working face,based on the analysis of field monitoring data of No.15108 working face,the stress distribution law and deformation and failure characteristics of surrounding rock of mining roadway in No.15108 working face are studied.on the basis of the supporting mode of return air roadway in No.15108 working face,the bolt support parameters of No.15109 return air roadway in adjacent working face are designed and optimized.the stress distribution characteristics and roadway deformation of roadway under different supporting parameters are simulated by FLAC3D numerical simulation software,and the reasonable supporting parameters are determined by comparing and analyzing the simulation results of different schemes.The results show that:When the pretightening force of bolt is unchanged,the surrounding rock of return air roadway is effectively controlled by the scheme 1,2 and 3,the supporting effect is obvious.when the distance between the anchor rods is the same,the less the bolt pre-tightening force is,the smaller the change of the top floor of the tunnel,the better the supporting effect.considering the engineering requirements and support cost,the anchor rod spacing is 800 mm and the pretightening force is 80 k N as the optimal scheme.