关键词: 大采高, 回撤通道, 数值模拟

Abstract: To ensure the safe and efficient withdrawal of the working face，the layout of 2307 preset withdrawal channel of Licun Coal Mine in Lu′an Mining Area is taken as the research background. Through theoretical mechanics analysis，it is concluded that with the increase of roadway width，the subsidence of the roof of the drawdown passage under different failure forms shows an increasing trend. By combining the⁃ oretical analysis with numerical simulation，the plastic zone，stress field and displacement field of the sur⁃ rounding rock of three different widths of drawdown channels were studied. When the width of the roadway is 5.5 m，the subsidence of the roadway roof is the smallest，the range of the surrounding rock stress and plastic failure zone is the smallest，and the surrounding rock is the most stable. Through field tests，it can be concluded that with the mining of the working face，the deformation of the preset drawdown channel af⁃ ter being disturbed is relatively small. Research shows that under the complex geological conditions of Li⁃ cun Coal Mine in Lu′an Mining Area，the optimal width of the preset drawdown passage for the 2307 work⁃ ing face is 5.5 m. This design scheme can effectively control the subsidence of the roof and the range of plastic damage to the surrounding rock，significantly enhance the stability of the drawdown channel，and achieve the comprehensive benefits of shortening the cycle of moving and reversing the working face，re⁃ ducing the loss of raw coal，and lowering the safety risks for the operators. It provides an important techni⁃ cal reference for the safe and efficient drawdown of deep mines.

Key words: large mining height, drawdown channel, numerical simulation