综采工作面过断层顶板破坏机理及控制技术

针对工作面过断层时遇到的冒顶和煤壁片帮等问题,以麻家梁矿14207综采工作面为工程背景,通过建立工作面断层区顶板的弹性深梁力学模型,对其顶板应力分布规律进行分析,据此提出深浅分带刚柔耦合注浆的围岩控制技术。并利用FLAC^3D数值模拟软件对所提控制方案进行计算分析,结合现场监测数据进行对比判定。研究表明:工作面顶板破断主要由有效极限剪应力引起的;模拟中围岩塑性区范围和顶板下沉量明显减小;工程实测顶板位移量从38cm减小到7cm,下沉量减小81.6%。深浅分带刚柔耦合注浆围岩控制技术可以有效的解决冒顶和片帮问题。

Failure Mechanism and Control Technology of Fully Mechanized Mining Face Passing through Fault Roof

In view of the problems of roof and coal wall slabs encountered when the working face passes through the fault, the 14207 fully mechanized mining face of Majialiang Mine is taken as the background. By establishing the mechanical model of the elastic deep beam of the roof in the fault zone of the working face, the stress distribution law of the roof is analyzed, and the surrounding rock control technology of the rigid-flexible coupling with the rigid-flexible coupling is proposed. Flac3d is used to calculate and analyze the proposed control scheme, and combined with on-site monitoring data for comparison and determination. The research shows that the top plate breakage of the working face is mainly caused by the effective ultimate shear stress; the plastic zone range and the roof subsidence of the surrounding rock are obviously reduced in the simulation; the measured displacement of the roof is reduced from 38 cm to 7 cm, and the subsidence is reduced 81.6% small. The shallow and shallow zone rigid-flexible coupling grouting surrounding rock control technology can effectively solve the problem of roofing and chipping.