Failure mechanism of tunnel face and soil arch effects in auxiliary air balanced shield using three-dimensional material point method

WANG Shuying; LIU Tingyu; ZHENG Xiangcou; ZHANG Tao

doi:10.11779/CJGE20240222

Volume 47 Issue 11

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Chinese Journal of Geotechnical Engineering > 2025 > 47(11): 2264-2273. > DOI: 10.11779/CJGE20240222

WANG Shuying, LIU Tingyu, ZHENG Xiangcou, ZHANG Tao. Failure mechanism of tunnel face and soil arch effects in auxiliary air balanced shield using three-dimensional material point method[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(11): 2264-2273. DOI: 10.11779/CJGE20240222

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Failure mechanism of tunnel face and soil arch effects in auxiliary air balanced shield using three-dimensional material point method

1.
School of Civil Engineering, Central South University, Changsha 410075, China
2.
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 410075, China

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This work was supported by National Natural Science Foundation of China (Grant No. 52022112), National Natural Science Foundation of China (Grant No. 52478403), National Natural Science Foundation of China (Grant No. 52308425), Postdoctoral International Exchange Program (Grant No. YJ20220219), China Postdoctoral Science Foundation (Grant No. 2023TQ0382) and Fundamental Research Funds for the Central Universities of Central South University (Grant No. 2023ZZTS0675)

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Received Date: March 11, 2024
Revised Date: June 17, 2024
Accepted Date: July 08, 2024
Available Online: July 08, 2024
Published Date: July 09, 2024

Abstract

Abstract

The collapse of tunnel face poses a serious threat to the safety of tunnel construction, and a comprehensive understanding of the entire evolutionary failure mechanism is the key premise for disaster prevention and treatment measures. By using the three-dimensional material point method (MPM), the large deformation behaviours of the collapse of tunnel face in the auxiliary air pressure balanced shield are investigated. The effectiveness of the MPM in analyzing the failure problems of tunnel face is validated by comparing the results of the limit support force, ground settlement and stress distribution with those of the experimental tests. Subsequently, a series of field-scale numerical simulations are conducted to explore the dynamic characteristics of collapse of tunnel face, response of ground deformation, and evolution of soil arch under various burial depths, support air pressures and cutter head types. The results demonstrate that the development rate and final mass of the collapse of tunnel face are reduced by the support of air pressure and cutter head, and a faster early collapse rate is observed in a deeper burial depth. The soil arch emerges with the ground deformation induced by the collapse of tunnel face, and the collapse of ground surface grows rapidly when the soil arch reaches the ground surface and vanishes. The MPM can effectively capture the entire dynamic process of the collapse of tunnel face in the auxiliary air pressure balanced shield, therefore providing valuable insights for preventing the collapse of tunnel face and predicting the post-failure behaviors in similar projects.
- shield tunnel,
- material point method,
- auxiliary air pressure tunnelling,
- tunnel face instability,
- soil arch

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References (26)

References

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ZHANG Tao

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School of Civil Engineering, Central South University, Changsha 410075, China

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Failure mechanism of tunnel face and soil arch effects in auxiliary air balanced shield using three-dimensional material point method