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迎采对掘巷道密集孔卸压及分段控制技术研究

Research on the technology of pressure relief by intensive drilling and segmented control in facing excavation roadway

  • 摘要: 针对炭窑坪煤矿坚硬顶板迎采对掘巷道变形破坏严重、难以维护等问题,采用理论分析与数值模拟相结合的方法,分析了该类巷道围岩的垂直应力动态演化规律,揭示了动静载叠加扰动效应下巷道围岩变形破坏机理,提出了“密集孔切顶卸压及分段控制”技术。结果表明:迎采对掘巷道的垂直应力分布在走向上呈现3个阶段,即起始阶段(超前工作面50 m以外)、快速升高阶段(超前工作面50 m至滞后150 m范围内)、稳定阶段(滞后工作面150 m以外);迎采对掘巷道变形破坏原因为采空区大面积悬顶产生的侧向支承压力与邻近工作面采动产生的动载相互叠加作用;提出的“密集孔切顶卸压及分段控制”技术具体为在工作面煤柱侧顶板布置直径65 mm、深度18 m、孔间距400 mm的密集钻孔,在工作面采动影响下,钻孔间塑性区导通,主动控制基本顶断裂位置。实践表明,采用密集孔卸压及分段控制技术对类似巷道围岩稳定性控制具有指导意义。

     

    Abstract: In view of the problems of serious deformation and damage as well as difficult maintenance to hard roof of the facing excavation roadway due in Tanyaoping Coal Mine, the dynamic evolution law of the vertical stress of the surrounding rock of this type of roadway was analyzed by combination of theoretical analysis and numerical simulation, the deformation and failure mechanism of the surrounding rock of the roadway under the superimposed disturbance effect of dynamic and static was revealed, and the technology of "roof cutting and pressure relief by intensive drilling and segmented control" was proposed. The results show that the vertical stress distribution of the facing excavation roadway presents three stages along strike: the initial stage (beyond 50 m ahead of the working face), the rapid rise stage (from 50 m ahead of the working face to 150 m behind the working face) and the stable stage (beyond 150 m behind the working face). The reason for the deformation and damage of the facing excavation roadway is: superposing the lateral support pressure generated by the large-area suspended roof in the goaf and the dynamic load generated by the mining of the adjacent working face. Specifically, the technology of "roof cutting and pressure relief by intensive drilling and segmented control" is to arrange intensive drilling with a diameter of 65 mm, a depth of 18 m, and a hole spacing of 400 mm on the coal pillar side roof of the working face. Under the influence of mining in the working face, the plastic zone between the drillings is connected, and the fracture position of the main roof is actively controlled. The practice shows that the technology of "roof cutting and pressure relief by intensive drilling and segmented control" has guiding significance for the stability control of surrounding rock in similar roadways.

     

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