下霍煤矿2305回风顺槽小煤柱沿空掘巷围岩控制技术研究

Study on Surrounding Rock Control Technology of Driving Roadway Along Goaf with Small Coal Pillar of the 2305 Return Air Trough in Xiahuo Coal Mine

为确保下霍煤矿2305回风顺槽留窄煤柱沿空掘巷围岩稳定,采用理论计算和数值模拟的手段确定了护巷窄煤柱的最佳宽度为8 m;针对沿空掘巷非对称变形特征,提出了“锚网索”+煤柱帮锚索补强支护措施。现场应用结果表明:沿空掘巷期间巷道顶底板和两帮移近量最大值分别为162.48 mm和206.37 mm,巷道围岩变形控制效果良好,为类似工程条件巷道施工提供了借鉴。

In order to ensure the stability of surrounding rock of driving roadway along goaf with narrow coal pillar in the 2305 return air trough in Xiahuo Coal Mine,the optimum width of narrow coal pillar for protecting roadway is determined to be 8 m by means of theoretical calculation and numerical simulation.According to the asymmetric deformation characteristics of roadway excavation along the goaf,the measures of"anchor mesh cable"+coal pillar wall anchor cable reinforcement and support are put forward.?The field application results show that the maximum values of the roof and floor and the two sides of the roadway during the period of driving roadway along goaf are 162.48 mm and 206.37 mm respectively,the surrounding rock deformation control effect of the roadway is good,which provides a reference for roadway construction under similar engineering conditions.