In view of multiseam mining under goaf, the surrounding rock control problem of lower coal roadway will be affected by concentrated coal pillar left in upper coal seam goaf and dynamic pressure superposition of working face in this coal seam. Under the geological environment of No. 16 extrathick coal seam in the Laoshidan coal mine and taking the working face 031604 as the research background, the reasonable docking position selection of the withdrawal roadway and the docking roadway in the middle mining period and the surrounding rock stability control problems of the withdrawal roadway and the docking roadway during the final mining period were studied by using the methods of field theoretical analysis, numerical simulation, and field measurement. The mechanical mechanism of the nonuniform failure of the retreating roadway and the docking roadway during the final mining period is shown, and the control method of the surrounding rock stability of the roadway is put forward and applied. The results show that (1) through the analysis of the superimposed stress under the concentrated coal pillar and the coal seam in advance, the specific butt joint position is arranged at 860 m away from the open-off cut, which is 10 m away from the goaf of No. 12 coal seam. (2) With the working face 031604 advancing through the process, the deviatoric stress value of the withdrawal roadway gradually increases, the maximum principal stress of the two sides of the roadway deflects clockwise from the vertical direction to the horizontal direction, its angle also gradually increases, and the shape of the plastic zone gradually expands from symmetry to asymmetry. (3) It is revealed that the peak value of deviatoric stress on both sides of the docking position of docking roadway increases gradually under the influence of mining and deflects anticlockwise to the vertical direction with the principal stress angle. The joint action of both is the mechanical mechanism that causes the plastic zone to expand in an asymmetric shape. (4) The coordinated control scheme of support (anchor bolt and anchor cable)—modified (grouting)—is adopted for the withdrawal roadway, and the coordinated control scheme of support (anchor bolt and anchor cable)—changing the cross-section shape of the roadway—is adopted for the docking roadway. The purpose of the smooth connection of working face and rapid and safe withdrawal of equipment is achieved on site.

中文翻译：

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超厚煤层多动压下对接巷道围岩破坏机理及稳定性控制

针对采空区下多煤层开采，上煤层采空区留有集中煤柱和该煤层工作面动压叠加影响下煤巷围岩控制问题。在老石丹煤矿16号特厚煤层地质环境下，以031604工作面为研究背景，合理选择中采回采巷道与对接巷道的对接位置及围岩稳定性采用现场理论分析、数值模拟、现场实测等方法，研究了采煤末期回采巷道和对接巷道的控制问题。揭示了后退巷道和对接巷道在末采期非均匀破坏的力学机理，提出并应用了巷道围岩稳定性控制方法。结果表明：（1）通过预先对集中煤柱与煤层下的叠加应力分析，具体对接位置布置在距开挖口860 m处，距开挖口10 m处。 12号煤层采空区。(2)随着工作面031604的推进，回撤巷道偏应力值逐渐增大，巷道两侧最大主应力从垂直方向顺时针偏向水平方向，其角度也逐渐增大增加，塑性区的形状逐渐从对称扩展到不对称。(3) 表明，在采矿影响下，对接巷道对接位置两侧偏应力峰值逐渐增大，并随主应力角向垂直方向逆时针偏转。两者的共同作用是使塑性区以不对称形状膨胀的机械机制。(4) 回撤巷采用支护（锚杆和锚索）协调控制方案——修改（注浆）——支护（锚杆和锚索）协调控制方案——改变断面形状巷道——采用对接巷道。