主回撤通道围岩控制质量的好坏直接影响工作面撤出效率以及矿井安全生产。为了进一步优化回撤通道支护方案,提高支护效率,以神东矿区大柳塔矿52501主回撤通道为例,采用FLAC3D数值模拟方法,对末采阶段回撤通道围岩塑性破坏区演化规律开展研究,给出了末采阶段主动支护的作用范围及效果,提出主动支护优化的可行性。进一步对现有回撤通道支护方案进行优化,并在相邻工作面主回撤通道进行应用。研究结果表明:优化后巷道正帮和副帮变形量分别为302mm和73mm,较原方案变形量增加了5.9%和7.3%;顶板的变形量为236mm,较原方案增加了4.8%。优化方案支护参数仍然可使主回撤通道保持稳定,并且支护强度适度降低,使得成本大幅下降,效率提高。

The control of the surrounding rock in the main dismantling gateway directly affects the dismantling efficiency of the working face and mine safety production. To further optimize the support plan and improve the supporting efficiency for the dismantling gateway, No. 52501 main dismantling gateway at Daliuta Mine in Shendong mine area was taken to study the the evolution of plastic failure zone of surrounding rock in the main dismantling gateway during the final mining stage by means of FLAC3D numerical simulation. The range and effect of active supports during the final mining stage were determined, and the feasibility of optimizing active supports was proposed. The existing dismantling gateway support plan was further optimized and applied to the main dismantling gateway of an adjacent working face. The results show that, after optimization, the deformations of roadway sides were mm and mm, respectively, increasing by 5. 9% and 7. 3%, compared to the original plan. The roof deformation was mm, showing an increase of 4. 8%, compared to the original plan. The optimized support parameters not only maintained the stability of the main dismantling gateway, but also moderately reduced the support strength, hence, a significant reduction in costs and improvement in efficiency was achieved.