动压煤巷群围岩分区劣化控制方法研究

Study on Control Method of Subarea Deterioration of Surrounding Rock of Dynamic Pressure Coal Roadway Group

为了降低剧烈采动过程中动压对煤巷群围岩稳定性的破坏,提出动压煤巷群围岩分区劣化控制方法。模拟动压巷道群围岩受力破坏状况,将东翼巷道分为上采区工作面和下采区工作面,分析上、下采区工作面采动产生的动压对东翼大巷及硐室的影响,得出剧烈动压下煤巷围岩应力分布特征及巷道围岩变形规律;依据获取的特征及规律提出剧烈动压影响煤巷围岩分区强化控制技术,该技术通过回采动压作用区补强方案控制上采区工作面的围岩稳定性,通过掘采联合动压作用区强化修复方案控制下采区工作面的围岩稳定性。结果表明,采用所提控制方法后,两个观测站检测到的修复区顶板下沉量和修复区两帮移近量,随距本工作面距离的增加而降低,距本工作面距离为100m时修复区顶板下沉量较平稳,都在140mm左右;两帮移近量从距本工作面距离为90m开始稳定,其结果都在120mm左右,有效地降低了煤巷下采区的顶板下沉量和两帮移近量,提高了动压煤巷群围岩的稳定性。

In order to reduce the damage of dynamic pressure to the stability of surrounding rock of coal roadway group in the process of violent mining,a method for the control of surrounding rock partition degradation of dynamic pressure coal roadway group was proposed.The stress and failure status of surrounding rock of dynamic pressure roadway group were simulated.The east wing roadway was divided into upper and lower mining working faces,and the influence of dynamic pressure generated by mining on the east wing roadway and its chamber was analyzed.According to the acquired characteristics and rules,the paper proposes a technology to control the zoning and strengthening of surrounding rock affected by violent dynamic pressure on coal roadway.In this technology,the surrounding rock stability of the working face of the upper mining area is controlled by the reinforcement scheme of the mining area under the action of dynamic pressure,and the surrounding rock stability of the working face of the mining area is controlled by the reinforcement scheme of the mining area under the action of dynamic pressure.The experiment shows that,after adopting the proposed control method,the amount of roof subsidence and the amount of the two sides of the repaired area decrease with the increase of the distance from the working face.When the distance from the working face is 100m,the roof subsidence in the repair area is relatively stable,all of which are around 140mm.From the distance of 90m away from the working face,the two-sided displacement starts to be stable,and the result are all around 120mm,which effectively reduces the roof subsidence and two-sided displacement in the mining area under the coal roadway,and improves the stability of the surrounding rock of the dynamic pressure coal roadway group.