China Coal Development Co., Ltd.
Shandong Xinjulong Energy Co., Ltd.

针对大海则煤矿20102工作面回风巷道的围岩大变形问题,通过现场调研、数值模拟、支护参数计算等研究方法,在对巷道原有支护方案合理性评价的基础上,提出三个巷道支护参数优化方案,经过不同方案支护效果的模拟对比,确定了以方案二为最佳优化方案,并与原支护方案进行了模拟验证。结果表明:与原有支护方案相比,顶板下沉量最大约54.07mm,减少72.3%;两帮变形量最大约92.50mm,减少70.9%;围岩应力集中区面积减小且应力峰值降低38.03%。研究发现,在进行深部高应力煤巷支护方案设计时,可以通过采用适当增密巷道锚杆(索)间排距、增加锚固厚度等措施维持巷道稳定性,从而确保工作面的安全生产。

In response to the problem of large deformation of the surrounding rock in the return air roadway of the 20102 working face of Dahaize Coal Mine, three optimization schemes for the roadway support parameters are proposed based on the evaluation of the rationality of the roadway original support scheme through study methods such as on-site investigation research, numerical simulation, support parameter calculation and others. After simulation and comparison of support effects of different schemes, the second scheme is determined as the best optimization scheme and is simulated and verified with the original support scheme. The results show that compared with the original support scheme, the maximum subsidence amount of the roof is about 54.07 mm, a reduction of 72.3%; The maximum deformation amount of the two sides is about 92.50 mm, a reduction of 70.9%; The area of stress concentration zone in the surrounding rock decreases and the peak stress decreases by 38.03%. The research finds that in the design of deep high stress coal roadway support schemes, measures such as appropriately increasing the row spacing between roadway anchor rods (cables), increasing the anchoring thickness and so on can be taken to maintain roadway stability, thereby ensuring safe production on the working face.