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深部泵房吸水井硐室群穩定性控制對策及應用

Stability control strategy and application of deep pump absorbing well chamber group

  • 摘要: 為解決深部泵房硐室群失穩現象突出的問題,以大強煤礦?890水平泵房吸水井硐室群為工程背景,通過理論分析和數值模擬,分析硐室群的破壞原因,對比集約化設計和傳統設計對圍巖穩定性控制的效果. 基于恒阻大變形(NPR)錨索高恒阻、高延伸率和吸能的特性,建立NPR錨索支護下硐室交岔口圍巖能量失穩判據,提出以高預應力NPR錨索+立體桁架為核心的泵房吸水井集約化控制對策,并進行現場應用. 結果表明:相比傳統設計,集約化設計簡化了硐室布局和施工程序,同時能夠減小巷道位移、應力,使塑性區范圍減小并趨于均勻化,消除了空間效應;通過NPR錨索的高恒阻大變形和在桁架與圍巖間預留的間隙釋放圍巖變形能,通過NPR錨索的高預應力和立體桁架的強度限制圍巖變形,能有效保證巷道穩定;現場應用表明,該對策將圍巖變形控制在70 mm以內,應用效果良好,可為類似工程提供參考.

     

    Abstract: Deep rock mass is in a complex mechanical environment characterized by high ground stress, high ground temperature, high karst water pressure, and strong mining disturbance, resulting in difficult support and high levels of failure in the pump chamber group. To solve the problem of the instability of the deep pump chamber group, this paper takes the ?890-level pump absorbing well chamber group of the Daqiang coal mine as the engineering background. Through theoretical analysis, numerical simulation, and field tests, the reasons for the failure of the chamber group are analyzed, and the effects of intensive design and traditional design on the stability control of the surrounding rock are compared. According to the characteristics of high constant resistance, high elongation, and energy absorption of the negative Poisson’s ratio (NPR) cable, the instability energy criterion of intersection under the NPR cable support is established, where the chamber is stable at KN ≤ 1. The intensive control strategy of the pump absorbing well with a high prestressed NPR cable and three-dimensional truss as the core is presented and applied in the field. The results show that high ground stress, low surrounding rock strength, dense chamber group distribution, unreasonable excavation sequence of the chamber group, and inappropriate support are the main reasons for the failure of the deep pump absorbing well chamber group. Compared with the traditional design, the intensive design simplifies the layout and construction procedure of the chamber by considering the absorbing well, improves the stress conditions of the chamber, reduces the displacement and stress of the roadway, makes the plastic zone range smaller and more uniform, and eliminates the spatial effect. The deformation energy of the surrounding rock is released through the high constant resistance and large deformation of the NPR cable and the reserved gap between the truss and the surrounding rock, and the deformation of the surrounding rock is limited through the application of high prestress to the NPR cable and the strength of the three-dimensional truss material, which allows for the full use of the self-bearing capacity of the surrounding rock and effectively ensures the roadway stability. The field application shows that this strategy can effectively ensure the stability of the chamber group; the deformation of the surrounding rock is controlled within 70 mm, and there is no shedding, cracking, or destruction of the sprayed layer after concrete sealing, which indicates that the technology plays an important role in controlling the stability of the deep roadway and can provide a reference for similar projects.

     

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