Study on Asymmetric Failure and Control Measures of Lining in Deep Large Section Chamber
Abstract
:1. Introduction
2. Engineering Background
2.1. Engineering and Geology Background
2.2. Field Failure Analysis
3. Asymmetric Mechanical Model and Evaluation Index
3.1. Asymmetric Mechanical Model
3.2. Analysis Scheme
3.3. Evaluation Indexes
- bending moment change ratio
- bending moment balance ratio
- displacement change ratio
- displacement balance ratio
4. Analysis of Asymmetric Mechanical Behavior of Lining
4.1. Asymmetric Coefficient
4.1.1. Bending Moment Analysis
4.1.2. Displacement Analysis
4.2. Section Size
4.2.1. Bending Moment Analysis
4.2.2. Displacement Analysis
4.3. Lining Thickness
4.4. Summary and Engineering Recommendations
5. Control Measures and Application Effect
5.1. Control Measures
- ①
- After optimization, the net section width of the pump house is 5000 mm and the height is 7200 mm, which avoids the expansion of the lining and reduces the surrounding rock disturbance.
- ②
- The west straight wall and west arch shoulder of the pumping house adopt the Φ29 × 12,000 mm grouting anchor cable, and the other side adopts the Φ29 × 10,000 mm grouting anchor cable. The bottom arch adopts the Φ29 × 8000 mm grouting anchor cables. The diameter of the anchor hole is 38 mm, and two MSZ2870 resin cartridges are used. The cartridges can be cured after being stirred evenly for 5 min. After the end of grouting anchor cable is anchored, 150 kN preload is applied first, and then grouting is carried out one by one to reinforce the broken surrounding rock.
- ③
- On the outside of the existing section, double-layer reinforcement is bound on the whole section, with the diameter of transverse reinforcement of 28 mm and longitudinal reinforcement of 32 mm. C40 concrete is used for pouring, and the lining thickness is 500 mm.
5.2. Application Effect
6. Conclusions
- (1)
- Aiming at the asymmetric failure of lining in Wanfu Coal Mine pump house due to the secondary disturbance, the asymmetric mechanical model of the lining and the quantitative evaluation indexes such as the change rate of bending moment, the balance rate of bending moment, the change rate of displacement and the balance rate of displacement are established, and the influence laws of the asymmetric coefficient, the section size and the thickness on the bending moment and displacement of the lining are studied.
- (2)
- Under the action of asymmetric load, the bending moment and displacement of lining shows an obvious asymmetry. The larger the asymmetry coefficient is, the more significant the increase of bending moment and displacement will be. The larger the section size is, the more obvious the influence of the asymmetric load is. Increasing the lining thickness is beneficial to improve the lining resistance to the asymmetric load, when the lining thickness exceeds a certain value, the effect of increasing the lining thickness is no longer obvious.
- (3)
- The control measures with the core of “strengthening asymmetric support, reducing section size, improving lining strength” is proposed. The field application shows that the method can effectively restrain the asymmetric deformation of the surrounding rock, and the maximum deformation is only 7.3 mm, which ensures the long-term stability of the chamber. It has an important guiding significance for engineering under similar conditions.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Scheme No./Ai | Asymmetric Coefficient/λ | Invariant |
---|---|---|
A1 | 1 | q1, q2, q3 h, r1, r2 d |
A2 | 1.1 | |
A3 | 1.2 | |
A4 | 1.3 | |
A5 | 1.4 | |
A6 | 1.5 | |
A7 | 1.6 |
Scheme No./Bi | Section Size | Invariant | ||
---|---|---|---|---|
Arch Crown Radius/r1 | Wall Height/h | Arch Bottom Radius/r2 | ||
B1 | 4.0 | 2.3 | 0.2 | q1, q2, q3 d λ |
B2 | 5.0 | 3.3 | 0.3 | |
B3 | 6.0 | 4.3 | 0.4 | |
B4 | 7.0 | 5.3 | 0.5 | |
B5 | 8.0 | 6.3 | 0.6 | |
B6 | 9.0 | 7.3 | 0.7 | |
B7 | 10.0 | 8.3 | 0.8 |
Scheme No./Ci | Thickness/m | Invariant |
---|---|---|
C1 | 0.2 | q1, q2, q3 h, r1, r2 λ |
C2 | 0.3 | |
C3 | 0.4 | |
C4 | 0.5 | |
C5 | 0.6 | |
C6 | 0.7 | |
C7 | 0.8 |
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Huang, Y.; Jiang, B.; Ma, Y.; Wei, H.; Zang, J.; Gao, X. Study on Asymmetric Failure and Control Measures of Lining in Deep Large Section Chamber. Energies 2021, 14, 4075. https://doi.org/10.3390/en14144075
Huang Y, Jiang B, Ma Y, Wei H, Zang J, Gao X. Study on Asymmetric Failure and Control Measures of Lining in Deep Large Section Chamber. Energies. 2021; 14(14):4075. https://doi.org/10.3390/en14144075
Chicago/Turabian StyleHuang, Yubing, Bei Jiang, Yukun Ma, Huayong Wei, Jincheng Zang, and Xiang Gao. 2021. "Study on Asymmetric Failure and Control Measures of Lining in Deep Large Section Chamber" Energies 14, no. 14: 4075. https://doi.org/10.3390/en14144075