JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A

Accepted manuscript available online (unedited version)

Effect of adjacent excavation on the mechanical response of proximal soil and tunnels in normally consolidated clay: centrifuge model testing and numerical simulation

Author(s): Ren Peng CHEN^1, ^2, ^3, ⁴, Yong XU¹, Han Lin WANG^2, ^3, ⁴, Fan Yan MENG^2, ^3, ⁴
Affiliation(s): ¹Institute of Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; more
Corresponding email(s): wanghanlin@hnu.edu.cn
Key Words: Centrifuge model; Adjacent excavation; Tunnel; Retaining wall; Normally consolidated clay

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Ren Peng CHEN^1,^2,^3,⁴, Yong XU¹, Han Lin WANG^2,^3,⁴, Fan Yan MENG^2,^3,⁴. Effect of adjacent excavation on the mechanical response of proximal soil and tunnels in normally consolidated clay: centrifuge model testing and numerical simulation[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2500001

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author="Ren Peng CHEN^1,^2,^3,⁴, Yong XU¹, Han Lin WANG^2,^3,⁴, Fan Yan MENG^2,^3,⁴",
journal="Journal of Zhejiang University Science A",
year="in press",
publisher="Zhejiang University Press & Springer",
doi="https://doi.org/10.1631/jzus.A2500001"
}

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Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: Urban spaces are becoming increasingly congested, and excavations are frequently performed close to existing underground structures such as tunnels. Understanding the mechanical response of proximal soil and tunnels to these excavations is im-portant for efficient and safe underground construction. However, previous investigations of this issue have predominantly made assumptions of plane-strain conditions and normal gravity states, and focused on the performance of tunnels affected by excavation and unloading in sandy strata. In this study, a three-dimensional centrifuge model test is conducted to inves-tigate the influence of excavation on an adjacent existing tunnel in normally consolidated clay. The testing results indicate that the excavation has a significant impact on the horizontal deformation of the retaining wall and tunnel. Moreover, the set-tlements of the ground surface and the tunnel are mainly affected by the long-term period after excavation. The excavation is found to induce ground movement towards the pit, resulting in prolonged fluctuations in pore water pressure and lateral earth pressure. The testing results are compared with numerical simulations, achieving consistency. A numerical parametric study on the tunnel location shows that when the tunnel is closer to the retaining wall, the decreases in lateral earth pressure and pore water pressure during excavation are more pronounced.

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