Degradation of surrounding rock parameters in deep buried caverns: experimental and numerical simulation study

Yang Chaoshuai; Li Daqiang

doi:10.20265/j.cnki.issn.1007-2993.2023-0906

Volume 39 Issue 2

Apr. 2025

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Yang Chaoshuai, Li Daqiang. Degradation of surrounding rock parameters in deep buried caverns: experimental and numerical simulation study[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(2): 216-224. doi: 10.20265/j.cnki.issn.1007-2993.2023-0906

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Yang Chaoshuai, Li Daqiang. Degradation of surrounding rock parameters in deep buried caverns: experimental and numerical simulation study[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(2): 216-224. doi: 10.20265/j.cnki.issn.1007-2993.2023-0906

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Degradation of surrounding rock parameters in deep buried caverns: experimental and numerical simulation study

doi: 10.20265/j.cnki.issn.1007-2993.2023-0906

Yang Chaoshuai^{1, 2, 3
,},
Li Daqiang^{1, 2, 3}

1.
China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China
2.
Guangdong Provincial Key Laboratory of Intelligent Monitoring and Maintenance of Tunnel Structure, Guangzhou 511458, Guangdong, China
3.
China Railway Tunnel Consultants Co., Ltd., Guangzhou 511458, Guangdong, China

Received Date: 2023-12-08
Accepted Date: 2024-05-09
Rev Recd Date: 2024-04-18

Available Online: 2025-04-07

Publish Date: 2025-04-08

Abstract

Abstract

Tunnel excavation can lead to degradation of the stiffness and strength parameters of the surrounding rock, while the degradation law of the surrounding rock parameters during deep buried tunnel excavation is still unclear. Therefore, by conducting cross hole acoustic testing on the surrounding rock of the Muzhailing Tunnel, the spatial distribution pattern of parameter degradation during the excavation process of the tunnel cavern was revealed. At the same time, a parameter degradation model (CSS model) considering the effects of confining pressure and plastic strain was established and applied to the numerical simulation of the project. The results showed that the wave velocity of the surrounding rock decreased during the excavation process, and the degradation pattern of the surrounding rock parameters can be inferred. The use of CSS models can better reflect this parameter degradation phenomenon. The spatial distribution pattern of the deterioration of surrounding rock parameters can be represented by zones. The closer it is to the tunnel wall, the higher the degree of parameter degradation. In areas outside the plastic zone, parameter strengthening may also occur under sufficient confining pressure.
- deep buried cavern,
- degradation of surrounding rock,
- elastic-plastic behavior,
- cross hole acoustic test

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References(19)

References

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Degradation of surrounding rock parameters in deep buried caverns: experimental and numerical simulation study

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