Influence of extreme shallow jacked box tunnelling on underlying metro tunnels: A case study

Xu, Xiangde; Tong, Lei; Li, Zhuo Feng; Liu, Xing Wang; Hu, Qi; Yao, Hong Bo; Li, Jun Yi

doi:10.1016/j.undsp.2023.04.001

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…Ma et al [10] analyzed the influence of parallel rectangular pipe-jacking construction on land subsidence under different pipe thickness and spacing parameters based on numerical simulation. Xu et al [11] introduced a safer pipe-jacking construction method that reduces the soil-carrying effect of the overlying soil by filling with additional soil above the surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Undercrossing Shield Tunnels Excavation on Existing Rectangular Pipe-Jacking Tunnels

He,

Yang,

Zhang

2023

Applied Sciences

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Shield tunneling underneath existing rectangular pipe jacking can often lead to uneven settling. To solve the problem of excessive deformation of the existing underground pedestrian passages, excavated via the rectangular pipe-jacking method due to the adjacent shield tunnels construction beneath, a safety control plan has been proposed based on the shield tunnels constructed beneath a well-type underground pedestrian passage in Hohhot Subway. This plan involves the use of both numerical simulations and on-site monitoring to investigate the deformation patterns of the rectangular pipe jacking. The results suggest that the combined approach of interlayer soil grouting and steel support reinforcement is not only appropriate but also feasible for on-site implementation. It can be concluded that interlayer soil grouting for reinforcement was applied successfully to improve the strength of surrounding soils. Steel support reinforcement is advantageous for controlling the relative deformation between pipe segments. The maximum settlement induced by the shield tunneling for Passage A and Passage B was measured at 17.67 mm and 10.08 mm, respectively, with the final settlement distribution of the rectangular pipe jacking taking on a “W” shape. This study could provide a reference for the design and construction of shield tunnels that undercross existing rectangular pipe-jacking tunnels.

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Section: Introductionmentioning

confidence: 99%