煤矿动压巷道围岩稳定性协同卸压控制技术研究

煤矿动压巷道围岩的稳定性对矿井安全生产至关重要.为有效控制采动压力影响下的巷道失稳变形,以德通煤矿2201工作面动压巷道为工程背景,对动压巷道破坏现象及围岩应力演化规律等进行分析,结果表明:开采动压周期性叠加使巷道围岩垂直应力集中并呈双峰拱形非对称分布,巷道变形呈抛物线形,应力集中和位移最大区域巷道易失稳.因此,提出以...

Study on collaborative pressure relief control technology for surrounding rock stability of dynamic pressure roadway in coal mine

The stability of surrounding rock of dynamic pressure roadway in coal mine is very important to ensure the safety of mine production.In order to effectively control the instability deformation of roadway under the influence of mining pressure, taking the dynamic pressure roadway of 2201 working face in Detong Coal Mine as the engineering background, through the analysis of the failure phenomenon of dynamic pressure roadway and the evolution law of surrounding rock stress, this paper puts forward the stability control technology of dynamic pressure roadway cooperative pressure relief surrounding rock.This technology based on two-way cumulative presplitting blasting roof cutting pressure relief and constant resistance large deformation anchor cable yield pressure support.The research shows that the periodic superposition of mining dynamic pressure makes the vertical stress concentration of roadway surrounding rock and the distribution of double-peak arch asymmetry.The deformation of roadway is parabolic, and the roadway in the area with the maximum stress concentration and displacement is prone to instability.Therefore, the dynamic pressure transmission path was effectively cut off after the two-way cumulative presplitting blasting was applied to the dynamic pressure roadway, and the peak stress difference of the roadway was reduced by 19.6 %.After that, the constant resistance and large deformation anchor cable yield pressure support was applied to unloading dynamic pressure, and the reduction rate of roadway section was reduced from 60 % to 13 %.The influence of mining dynamic pressure on the stability of roadway was significantly weakened, which proved that the application effect of the stability control technology of surrounding rock with cooperative pressure relief was good, and it could provide useful guidance for similar mines.