Three-dimensional numerical investigation of ground settlement caused by side-by-side twin tunnels

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-02-27 DOI:10.1016/j.tust.2025.106509

Md Shariful Islam , Magued Iskander

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引用次数: 0

Abstract

A parametric study using 3D finite element analyses was conducted to investigate settlement behavior and interactions between side-by-side twin tunnels during excavation. The study considered six cover-to-diameter (C/D) ratios, ten pillar-to-diameter (P/D) ratios, and two construction sequences. The total settlement of the excavated twin tunnels and the settlement induced solely by the new second tunnel were analyzed. Validation was performed by comparing results with published case studies, showing trends consistent with existing literature. Key findings include: (1) greater cover depth produces a wider settlement trough and reduces second tunnel-induced settlement, though total settlement slightly increases; (2) cover depth significantly affects second tunnel-induced settlement, while pillar width impacts total settlement; (3) concurrent excavation causes slightly higher settlement and a deeper, wider trough compared to staggered excavation; (4) lower cover depths result in higher settlement increase rates. Finally, two design charts are proposed to estimate settlement from the second tunnel and the eccentricity of the maximum total settlement relative to the center of the new tunnel.

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.