注浆锚索主动超前支护技术在煤矿运输巷道支护中的应用

Application of grouting anchor cable active advance support technology in coal mine transportation roadway support

  • 摘要: 【目的及方法】基于某矿1404工作面运输巷道围岩松散破碎的地质条件,采用注浆锚索主动式超前支护控制围岩的稳定性。借助FLAC3D软件来模拟煤层开采过程中的超前支承压力以及巷道围岩变形特点,以分析工作面前方巷道围岩在不同推进距离条件下的相应变化特性。依据模拟结果,设计支护参数与注浆材料配比,并进行工程监测验证。【结果】研究结果显示,工作面推进过程中,超前支承压力影响范围约20 m,在超前工作面4~5 m左右达到峰值;随着与工作面距离的进一步增加,围岩整体呈现出非对称变形,回采帮侧变形要大于非回采帮侧;采用注浆锚索主动超前支护对围岩进行补强,鉴于回采帮侧变形较大,对回采帮侧每排补打3根高强锚杆,其余部位则通过补打注浆锚索进行加固;由于支承应力峰值距工作面较近,为缩短浆液凝结时间,将浆液水灰比定为1∶1,水泥浆和水玻璃体积比定为1∶0.5。【结论】工程监测表明,20 d后巷道围岩变形量趋于稳定,两帮变形量为80~110 mm,顶板下沉量为160~200 mm,支护设施正常工作,表明注浆锚索主动式超前支护技术能够对巷道围岩变形进行有效控制。

     

    Abstract: Based on the geological conditions of loose and broken surrounding rock of transportation roadway in 1404 working face of a mine, active advance support with grouting anchor cable is used to control the stability of surrounding rock.FLAC3D software is used to simulate the leading abutment pressure and the deformation characteristics of roadway surrounding rock in the coal mining process, and the corresponding change characteristics of roadway surrounding rock in front of the working face under different advancing distances are analyzed.According to the simulation results, support parameters and grouting material ratio are designed, and engineering monitoring and verification are carried out.The results show that during the advance of the working face, the influential range of the advance abutment pressure is about 20 m, and the peak value is about 4~5 m on the advance working face.With the further increase of distance from the working face, the whole surrounding rock shows asymmetric deformation, and the deformation of the stoping side is larger than that of the non-stoping side.In view of the large deformation on the side of the stoping wall, three high-strength bolts are added to each row of the side of the stoping wall, and the other parts are reinforced by grouting anchor cables.In order to shorten the setting time of grout, the water-cement ratio of grout is 1∶1, and the volume ratio of cement slurry and water glass is 1∶0.5.Engineering monitoring shows that the deformation of roadway surrounding rock tends to be stable after 20 d, the deformation of two sides is 80~110 mm, the subsidence of roof is 160~200 mm, and the supporting facilities work normally, which indicates that the active advance supporting technology of grouting anchor cable can effectively control the deformation of roadway surrounding rock.

     

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