采动影响下倾斜煤层蠕变巷道支护技术研究

Support technology of creep roadway in inclined coal seam under mining influence

针对灵新煤矿061601综采工作面运输巷部分区域发生蠕变,原有支护方案不能较好的控制围岩变形的情况,利用理论分析、数值模拟和现场试验进行倾斜煤层巷道围岩蠕变效应及支护技术研究。根据研究分析可知,在工作面掘进和回采阶段,巷道端头及煤柱帮区域应力集中较严重,且通过增加初始支护力对控制回采巷道围岩塑性区范围起正相关作用,在多阶段下原始支护和优化支护方案模拟对比分析,确定支护方案优化后,能够有效改善巷道浅部围岩承载能力,减缓围岩破坏小范围扩展,说明支护方案能够有效高巷道围岩抗变形能力。同时,在现场应用中优化后支护方案能够分别提升顶底板和两帮围岩控制能力,变形控制效果分别提升达到75.84%和65.49%,即整体巷道优化后的支护方案对围岩控制效果更有效,为矿井安全生产提供重要保障。

In view of the creep occurred in some areas of the transport roadway of 061601 fully mechanized mining face in Lingxin Coal Mine,the original support scheme cannot control the surrounding rock deformation well.The rock wall creep effect and support technology of inclined coal seam roadway are studied by means of theoretical analysis,numerical simulation and field test.It is determined that the regional stress concentration at the end of roadway and near sides of coal pillars is more serious in the stage of driving and recovery.And by increasing the initial supporting force,it plays a positive correlation role in controlling the range of plastic zone of surrounding rock of recovery roadway.After the simulation and comparative analysis of original support and optimized support scheme in multi-stage,it is defined that the optimization of support scheme can effectively improve the bearing capacity of shallow surrounding rock of roadway and slow down the small range expansion of surrounding rock failure,which shows that the support scheme can effectively improve the anti-deformation capacity of surrounding rock of roadway.In the field application,the optimized support scheme can improve the control ability of the roof and floor and the surrounding rock of the two sides respectively,and the deformation control effect can be improved to 75.84%and 65.49%,respectively,which turned out,the optimized support scheme of the whole roadway is more effective for the control of surrounding rock and provides an important guarantee for mine safety production.