Analytical methods on the influence of pile foundation excavation on the deformation of adjacent operating subway tunnel

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jun. 2026, Vol. 49 No. 6: 857-864

DOI: 10.3969/j.issn.1003-5060.2026.06.020

Authors

XU Shizheng $ ^{1} $, ZHANG Zhenhua $ ^{2} $, QIAN Yelin $ ^{1} $, CUI Wentian $ ^{2} $, SU Ying $ ^{1} $, XI Banglu $ ^{2} $

(1. Anhui Construction Engineering Road Port Construction Group Co., Ltd., Hefei 230022, China; 2. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: The pile foundation construction in close proximity to the operating subway tunnel can cause the additional displacement and stress on the surrounding soil of tunnel, resulting in large deformation and risky operation of the subway tunnel. Therefore, the Mindlin solution and the generalized Kelvin viscoelastic constitutive model were employed to establish the theoretical calculation model for the deformation of the adjacent subway tunnel caused by the pile foundation construction. Then, the effect of the pile foundation construction on the deformation of adjacent tunnel lining under different pile-tunnel distances $ (d) $ was analyzed by three-dimensional numerical simulation and theoretical calculation methods, and compared with the field monitoring data. The results show that the theoretical and numerical data are in agreement with the field monitoring data. The theoretical model provides closer predictions to the field measured values than the numerical simulation, which can effectively analyze the influence of the pile foundation construction on the deformation of adjacent subway tunnel. The vertical and horizontal displacements of the subway tunnel lining gradually decrease with the increase of pile-tunnel distance, based on which the construction of pile foundation adjacent to the operating subway tunnel in hard plastic clay areas of Hefei City can be divided into strong influence area $ (d< $ 1.0D), general influence area $ (1.0D\leq d\leq3.0D) $ and weak influence area $ (d>3.0D) $. The construction of the strong, general and weak influence areas should be monitored for seven days, three days and one day, respectively, to ensure the stability of the lining deformation.

Keywords: pile foundation construction; operating subway; tunnel deformation; theoretical model; viscoelasticity analysis

作者信息

徐士征 $ ^{1} $，张振华 $ ^{2} $，钱叶琳 $ ^{1} $，崔文天 $ ^{2} $，苏颖 $ ^{1} $，奚邦禄 $ ^{2} $

(1. 安徽建工路港建设集团有限公司，安徽合肥 230022；2. 合肥工业大学土木与水利工程学院，安徽合肥 230009)

摘要和关键词

摘要: 紧邻运营地铁隧道进行桩基施工会造成隧道周围土体的位移和应力发生改变, 从而导致既有地铁隧道出现变形, 影响隧道的安全运营。文章基于 Mindlin 解, 引入广义 Kelvin 黏弹性本构模型, 建立桩基开挖卸载引起邻近运营地铁隧道变形的理论计算模型, 分别通过三维数值模拟和理论计算方法分析不同桩隧间距 d 下, 桩基施工对邻近隧道衬砌变形的影响规律, 并与现场监测数据进行对比。结果表明: 理论模型和数值模型计算结果与现场监测结果基本相同, 理论模型解析计算结果相比数值模拟计算结果更接近现场实测值, 可以有效分析桩基开挖对邻近运营地铁隧道的变形影响; 随着桩隧间距增大, 地铁隧道衬砌的竖向和水平位移逐渐减小, 据此可将合肥市硬塑性黏土地区紧邻运营地铁隧道的桩基施工分为强影响区施工 $ (d<1.0D) $ 、一般影响区施工 $ (1.0D \leqslant d \leqslant 3.0D) $ 和弱影响区施工 $ (d>3.0D) $ , 强影响区、一般影响区和弱影响区施工分别需监测 7、3、1 d 以保证衬砌变形达到稳定。

关键词: 桩基施工；运营地铁；隧道变形；理论模型；黏弹性分析

Funding

国家自然科学基金资助项目（51979068）；教育部新世纪优秀人才支持计划资助项目（NCET-12-0838）

合肥工业大学学报(自然科学版)

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