Soil deformation and excess pore water pressure caused by excavation of twin-bored tunnels in soft soil

DING Zhi; HONG Zhe-hao; FENG Cong-lie; WEI Xin-jiang; XU Tao; WANG Tao

doi:10.11779/CJGE202008011

Volume 42 Issue 8

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Chinese Journal of Geotechnical Engineering > 2020 > 42(8): 1465-1473. > DOI: 10.11779/CJGE202008011

DING Zhi, HONG Zhe-hao, FENG Cong-lie, WEI Xin-jiang, XU Tao, WANG Tao. Soil deformation and excess pore water pressure caused by excavation of twin-bored tunnels in soft soil[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(8): 1465-1473. DOI: 10.11779/CJGE202008011

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Soil deformation and excess pore water pressure caused by excavation of twin-bored tunnels in soft soil

1.
Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, China
2.
Department of Civil and Environmental Engineering, University of Macau, Macao 999078, China
3.
China Design Group Corporation Limited, Nanjing 210014, China

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Received Date: October 15, 2019
Available Online: December 05, 2022

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Abstract

Abstract

The theoretical solutions for the soil deformation and excess pore water pressure caused by excavation of twin-bored tunnels in saturated soft soil are given. The data from a project of twin-bored tunnels of the Hangzhou Metro Line 2 is used to validate these solutions. The effects of additional thrust, friction between the shield and the soil and tail void grouting on the vertical deformation of the soil are investigated. It is shown that when the shield is close to the reference section, the influence of such parameters on the soil deformation is great. After the shield passing the reference section for a certain distance, the lateral displacement of the ground surface and the excess pore water pressure tend to be stable. The influence of the friction between the shield and the soil on the excess pore water pressure is limited within half the length that the shield has passed. When the shield leaves the reference section, the excess pore water pressure generated by the tail void grouting approaches 0. The research may provide guidance for future tunnel projects in similar soft soil as in Hangzhou.
- soft soil,
- twin-bored tunnel,
- shield tunneling,
- soil deformation,
- pore pressure change

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References

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