针对纳林河二号矿井31120工作面窄煤柱沿空掘巷巷道围岩采掘期间变形严重问题,采用理论分析、数值模拟及现场监测等方法研究了沿空掘巷贯通期间矿压影响范围及显现规律,现场采用监测设备对巷道煤岩体进行监测。研究表明:工作面侧向支承压力峰值在40m处,窄煤柱沿空掘巷期间巷道两侧处于应力降低区,煤柱中性面区域处于弹性阶段,有较强的承载能力,但掘巷期间两帮出现较小的位移下沉。掘进贯通期间的地音频次与能量整体较高,贯通期间危险程度较大,滞后迎头影响范围较远。针对沿空掘进贯通期间滞后迎头矿压显现较强的情况,在掘进贯通期间迎头采取多轮大直径钻孔卸压,可有效降低掘进贯通区域煤体应力,为窄煤柱沿空掘进顺利贯通提供了有效保障。

In response to the serious deformation problem of the roadway surrounding rock during the mining and excavation period of narrow coal pillars roadway excavation along goaf of the 31120 working face in Nalinhe No.2 Mine, methods of theoretical analysis, numerical simulation, on-site monitoring and others are adopted to study the impact range and behavior regularity of mine pressure during the period of roadway excavation and penetration along goaf. Monitoring equipment is used on site to monitor the coal and rock mass of the roadway. The research shows that the lateral support pressure peak of the working face is at 40 m. During the period of narrow coal pillars roadway excavation along goaf, both sides of the roadway are in the stress reduction area, and the neutral plane area of coal pillars is in the elastic stage, with relatively strong bearing capacity. However, during the excavation of the roadway, there is relatively small displacement and subsidence occure on both sides. The frequency and energy of ground sounds during the excavation and penetration period are generally high, and the degree of danger during the penetration period is relatively high. The head-on impact range of the lagging is far away. In view of the situation of relatively strong mine pressure behavior of lagging head-on during the excavation and penetration along goaf period, multiple rounds of large diameter drilling boreholes are used to relieve pressure during the excavation and penetration period, which can effectively reduce the stress of the coal body in the excavation and penetration area and provide effective guarantee for the smooth penetration of narrow coal pillars excavation along goaf.