中文摘要：

采用UDEC软件模拟了浅埋煤层4,5,6,7 m采高煤壁变形与片帮过程,揭示了大采高煤壁片帮表现为受压＂柱条＂失稳特征。建立了煤壁片帮的柱条模型,通过柱条挠度分析得出了大采高工作面煤壁最容易发生片帮的部位在0.6倍的采高处。研究认为随着采高的增大,塑性区宽度增加,煤壁柱条增多,柱条水平位移增大,柱条稳定性降低。通过加强顶板支护、加快推进速度和合理的护帮,改善柱条的约束条件,可以有效提高煤壁稳定性,控制煤壁片帮。

英文摘要：

By using UDEC software, we have simulated the coal wall deformation and spalling processes when the mining heights of longwall face in shallow seam are 4,5,6,7 m,respectively, and found that the coal wall spalling of large mining-height presented ＂vertical slice＂ failure feature. Then, the vertical slice mechanical model was set up. The results show that the most easily spalling position is at the 0.6 times of mining height through the deflection analysis of vertical slice. In addition, with the increase of mining height, the width of coal wall plastic zone, the vertical slice number, and the horizontal deformation of vertical slice will increase, while the stability of vertical slice will decrease. The stability of coal wall can be effectively improved, and the coal wall spalling will be well controlled, by enhancing the roof support, speeding up the mining speed, protecting the coal wall properly, and improving the constraint conditions of coal wall vertical slice.