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

SUN Xiaoming; ZHU Mingqun; ZHANG Yong; XU Aiguo; CUI Li; MIAO Chengyu; ZHAO Chengwei; ZHANG Shangkun

doi:10.13374/j.issn2095-9389.2022.08.22.001

Volume 45 Issue 10

Oct. 2023

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Article Navigation > Chinese Journal of Engineering > 2023 > 45(10): 1693-1703

SUN Xiaoming, ZHU Mingqun, ZHANG Yong, XU Aiguo, CUI Li, MIAO Chengyu, ZHAO Chengwei, ZHANG Shangkun. Stability control strategy and application of deep pump absorbing well chamber group[J]. Chinese Journal of Engineering, 2023, 45(10): 1693-1703. doi: 10.13374/j.issn2095-9389.2022.08.22.001

Citation:

SUN Xiaoming, ZHU Mingqun, ZHANG Yong, XU Aiguo, CUI Li, MIAO Chengyu, ZHAO Chengwei, ZHANG Shangkun. Stability control strategy and application of deep pump absorbing well chamber group[J]. Chinese Journal of Engineering, 2023, 45(10): 1693-1703. doi: 10.13374/j.issn2095-9389.2022.08.22.001

Citation:

SUN Xiaoming, ZHU Mingqun, ZHANG Yong, XU Aiguo, CUI Li, MIAO Chengyu, ZHAO Chengwei, ZHANG Shangkun. Stability control strategy and application of deep pump absorbing well chamber group[J]. Chinese Journal of Engineering, 2023, 45(10): 1693-1703. doi: 10.13374/j.issn2095-9389.2022.08.22.001

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

doi: 10.13374/j.issn2095-9389.2022.08.22.001

SUN Xiaoming^{1, 2},
ZHU Mingqun^{1, 2},
ZHANG Yong^{1, 2
,
,},
XU Aiguo³,
CUI Li^{1, 2},
MIAO Chengyu^{1, 2},
ZHAO Chengwei⁴,
ZHANG Shangkun^{1, 2}

1.
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2.
School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
3.
Tiefa Coal Industry Group Daqiang Coal Mine Co. LTD, Shenyang 110500, China
4.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

More Information

Corresponding author: E-mail: cumtbzy558@163.com
Received Date: 2022-08-22
Available Online: 2022-09-29
Publish Date: 2023-10-25

Abstract

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 K_N ≤ 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.
- deep,
- chamber group,
- intensive,
- NPR cable,
- stability control

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References(26)

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