土工基础

土工基础 ›› 2023, Vol. 37 ›› Issue (5): 773-777.

• 专题论述 • 上一篇    下一篇

基坑开挖对既有地铁隧道的安全评估分析

郭 珅1，赖荫楠2   

  1. （1.中机三勘岩土工程有限公司，武汉 430000；2.福建省陆海工程科技有限公司,福州 350000）
  • 收稿日期:2022-04-07 修回日期:2022-04-12 出版日期:2023-10-31 发布日期:2023-10-26
  • 作者简介:郭珅（1994-），女，工程师，硕士，研究方向为岩土工程。

Analysis of Safety Assessment of Existing Subway Tunnels of a Nearby Deep Excavation

GUO Shen1， LAI Yinnan2   

  1. (1.China Machinery TIDI Geotechnical Engineering Co. Ltd., Wuhan 430000；
    2.Fujian Land and Marine Engineering Technology Co. Ltd., Fuzhou 350000)
  • Received:2022-04-07 Revised:2022-04-12 Online:2023-10-31 Published:2023-10-26

摘要： 以紧邻某地铁区间隧道的深基坑工程为例，利用Midas GTS NX软件对基坑开挖过程中临近地铁隧道的变形进行三维模拟仿真，分析基坑开挖过程对周边地表沉降、围护结构水平、竖向变形规律以及对既有地铁隧道衬砌结构的变形影响。研究表明，基坑开挖引起的周边地表最大沉降量为8.20 mm、围护结构最大水平变形为10.86 mm、最大竖向变形为3.28 mm，均在规范限值内；基坑开挖引起的隧道衬砌结构的最大水平变形为3.88 mm，最大竖向沉降为2.28 mm，均满足区间隧道安全运营的限值要求，结果表明基坑支护方案合理具有可行性。

关键词: 基坑支护, 数值模拟, 地铁隧道, 变形

Abstract: This paper presents a case history of a deep excavation near an existing regional subway tunnel. The entire excavation and supporting process are three dimensionally simulated throughout a numerical model by using the commercial software Midas GTS NX. The influence of excavation on the ground subsidence, vertical and horizontal deformation of the supporting structure and on the deformation of lining structure of the existing tunnel are analyzed. The results show that the maximum settlement of the surrounding surface caused by the excavation is 8.20 mm, the maximum horizontal deformation of the enclosure structure is 10.86 mm, and the maximum vertical deformation is 3.28 mm, all within the specification limits. The maximum horizontal deformation of the existing lining structure is 3.88 mm, and the maximum vertical settlement is 2.28 mm. All deformations meet the limit requirements for safe operation of the interval tunnel. 


Key words: Deep Excavation Support, Numerical Simulation, Subway Tunnel, Deformation

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