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Abstract

To address the engineering challenge of excessive structural settlement caused by shield tunneling at close range beneath existing pile-supported buildings, this paper takes an intercity railway shield tunnel project passing beneath an industrial park as its engineering background. Numerical simulations were conducted using GTS NX software and combined with monitoring data collected during shield tunneling to investigate the effects of pile cutting by the shield machine on the ground surface and buildings, as well as to examine the rationality of reinforcement measures and the mechanisms of pile foundation deformation. The results are as follows. ① The ground surface exhibits a slight heaving trend, while the building settlement is significantly greater than the ground surface settlement. The stage where the shield cuts through the piles contributes to over 65% of the total settlement, representing the primary risk source. The secondary disturbance effect caused by the overlapping excavation of twin tunnels increases the pile foundation settlement by approximately 40% compared with the single-tunnel condition, resulting in a maximum building settlement of ‒ 21.66 mm;② The combined reinforcement method of ground grouting and raft foundation underpinning is effective in controlling structural displacement, reducing pile foundation settlement by an average of 5.2‒6.1 mm (a reduction of 35%‒40%) and successfully keeping settlement at most monitoring points within the allowable range;③ Pile foundations intruding into the tunnel with a clearance of less than 0.5D exhibit the most severe deformation. The stiffness effect of the superstructure leads to “coordinated deformation of pile groups ”, which inhibits differential settlement but exacerbates overall settlement. The findings can provide a reference for risk control and reinforcement design of shield tunnels passing underneath existing pile-supported buildings with masonry structures.

Publication Date

10-29-2026

DOI

10.14048/j.issn.1671-2579.2026.05.024

First Page

230

Last Page

237

Submission Date

October 2026

Reference

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