Stability control strategy and application of deep pump absorbing well chamber group
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摘要: 为解决深部泵房硐室群失稳现象突出的问题，以大强煤矿−890水平泵房吸水井硐室群为工程背景，通过理论分析和数值模拟，分析硐室群的破坏原因，对比集约化设计和传统设计对围岩稳定性控制的效果. 基于恒阻大变形(NPR)锚索高恒阻、高延伸率和吸能的特性，建立NPR锚索支护下硐室交岔口围岩能量失稳判据，提出以高预应力NPR锚索+立体桁架为核心的泵房吸水井集约化控制对策，并进行现场应用. 结果表明：相比传统设计，集约化设计简化了硐室布局和施工程序，同时能够减小巷道位移、应力，使塑性区范围减小并趋于均匀化，消除了空间效应；通过NPR锚索的高恒阻大变形和在桁架与围岩间预留的间隙释放围岩变形能，通过NPR锚索的高预应力和立体桁架的强度限制围岩变形，能有效保证巷道稳定；现场应用表明，该对策将围岩变形控制在70 mm以内，应用效果良好，可为类似工程提供参考.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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Key words:
- deep /
- chamber group /
- intensive /
- NPR cable /
- stability control
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图 4 不同断面的围岩位移和应力云图. (a) 断面I; (b) 断面II; (c) 断面III
Figure 4. Cloud map of surrounding rock displacement and stress in different sections: (a) section I; (b) section II; (c) section III
图 5 不同断面的围岩塑性区分布图
Figure 5. Distribution map of the surrounding rock plastic zone in different sections
图 13 耦合支护后不同断面围岩位移和应力云图
Figure 13. Cloud map of surrounding rock displacement and stress in different sections after coupling support
图 14 耦合支护后不同断面监测点位移曲线. (a)垂直位移; (b)水平位移
Figure 14. Displacement curves of monitoring points in different sections after coupling support: (a) vertical displacement; (b) horizontal displacement
图 15 耦合支护后不同断面处围岩塑性区分布图
Figure 15. Distribution map of the surrounding rock plastic zone in different sections after coupling support
图 16 巷道围岩位移监测曲线. (a) 泵房; (b) 壁龛
Figure 16. Displacement monitoring curve of the roadway surrounding rock: (a) pump house; (b) stable
表 1 岩层物理力学参数
Table 1. Physical and mechanical parameters of the rock strata
Lithology Elastic modulus/GPa Poisson ratio Cohesion/MPa Friction/(°) Tension/MPa Density/(kg·m−3) Siltstone 7.8 0.23 0.5 21 0.2 2510 Sand-conglomerate 8.5 0.19 0.6 24 1.3 2600 
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