8.5m采高综采煤壁片帮块体研究及数值模拟

Research and Numerical Simulation on Coal Wall Spalling at Fully Mechanized Mining Face with 8.5 m Mining Height

基于上湾矿四盘区1_(-2)煤层8.5 m大采高工作面围岩力学条件,将煤壁片帮简化成两端固定的简支梁力学模型,计算得到最大挠度点为煤壁中点,煤壁中点最先出现片帮现象。煤壁受到顶板垂直压力和水平拉应力共同作用,建立力学模型得出片帮的深度和高度参数。通过煤体和片帮滑移体之间力学关系的建立,得到片帮块体的尺寸,并通过数值模拟验证其准确性。

Based on the specific geological condition of No. 4 panel 1-5 coal seam in Shangwan mine, the coal wall spalling is simplified as a one end fixed beam mechanical model, and calculate the maximum deflection at the middle of coal wall. Wall spalling phenonmenon appeared at the middle of coal wall firstly. Coal wall under roof vertical pressure and horizontal tensile stress interaction, the depth and height parameters of coal wall spalling are drawn by established the mechanical model. The size of the patch is obtained, and its accuracy is verified bv numerical simulati（m_