Method for calculating uplift of shield tunnels subjected to underlying grouting in soft clayey ground

MENG Fanyan; JIA Qi; CHEN Renpeng; CHEN Tong; CHENG Hongzhan

doi:10.11779/CJGE20230775

Volume 46 Issue 11

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Chinese Journal of Geotechnical Engineering > 2024 > 46(11): 2401-2409. > DOI: 10.11779/CJGE20230775

MENG Fanyan, JIA Qi, CHEN Renpeng, CHEN Tong, CHENG Hongzhan. Method for calculating uplift of shield tunnels subjected to underlying grouting in soft clayey ground[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(11): 2401-2409. DOI: 10.11779/CJGE20230775

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Method for calculating uplift of shield tunnels subjected to underlying grouting in soft clayey ground

MENG Fanyan^{1, 2, 3,},
JIA Qi^{1, 2, 3},
CHEN Renpeng^{1, 2, 3, ,},
CHEN Tong^{1, 2, 3},
CHENG Hongzhan^{1, 2, 3}

1.
College of Civil Engineering, Hunan University, Changsha 410082, China
2.
Hunan Provincial Engineering Research Center of Advanced Technology and Intelligent Equipment for Underground Space Development, Changsha 410082, China
3.
Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Changsha 410082, China

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Received Date: August 13, 2023
Available Online: April 22, 2024

Graphical Abstract

Abstract

Abstract

Grouting in the underlying strata is a common remedial measure for the excessive settlement of shield tunnels. In the case of structured soft clays, the grouting process induces dissipation of the excess pore pressure in the surrounding strata, which leads to settlement of the tunnel after the grouting process and subsequently reduces the uplift efficiency. In order to predict the longitudinal deformation of shield tunnels caused by grouting in the underlying strata, a two-stage method for calculating the uplift and settlement of shield tunnels is proposed considering the structural characteristics of the soil. It is applied to a grouting uplift case in Ningbo Metro Line 2, and the calculated uplift efficiency of the tunnel is approximately 51%, which is close to the measured uplift efficiency of an interval of Shanghai Metro Line 2 in soft clayey ground. Furthermore, the parametric study is conducted, considering the parameters of grouting, strata and tunnel. The results indicate that the final uplift settlement and uplift efficiency of the tunnel are positively correlated with the coefficient of subgrade reaction and grouting volume, while negatively correlated with the yield stress of the strata. As the cover-to-depth ratio of the tunnel increases, the final uplift of the tunnel within the grouted range decreases, while the uplift efficiency exhibits negligible change. The proposed method provides support for the design of grouting for uplift of shield tunnel, in soft clayey ground.
- structured clay,
- grouting,
- tunnel uplift,
- dissipation of excess pore water pressure,
- consolidation settlement

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References

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