Seepage analysis of shield tunnel crossing a water-rich fault zone at the bottom of the Yangtze River

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Oct.2025, Vol.48 No.10: 1433-1440

DOI: 10.3969/j.issn.1003-5060.2025.10.020

Authors

SHANG Zhaotao $ ^{1} $, LIU Wu $ ^{2} $, XIA Qin $ ^{1} $, SHANG Jinhang $ ^{2} $, WANG Zuocai $ ^{2} $

(Tunnel) Traffic Engineering Quality and Safety Supervision Station, Wuhu 241007, China; 2. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: Based on the crossing of the water-rich fault zone at the bottom of the Yangtze River for the Wuhu Chengnan River Crossing Tunnel, the three-dimensional seepage method was adopted to numerically simulate the shield tunnel seepage. The influences of the relative position of the excavation face to the fault zone, river water level, fault zone permeability and anisotropy, and mud-water pressure on tunnel seepage were systematically analyzed. The research results showed that tunnel seepage was affected by crossing the fault zone, and when the excavation face advanced into the fault zone, the leakage amount and the water pressure decrement obviously increased. The influence range of the fault zone on water pressure distribution was greater than its width. The larger the river water level, the higher the risk of tunnel leakage, and a rise in the water level from 5.64 m to 12.21 m would cause a 13% increase in tunnel leakage. The permeability and anisotropy of the fault zone both affected the tunnel seepage. The greater the permeability and anisotropy ratio of the fault zone, the greater the decrease in water pressure at the front of the excavation face and the greater the tunnel leakage amount. The mud-water pressure could reduce the disturbance of water pressure in the fault zone and the risk of tunnel leakage. However, a sudden increase in mud-water pressure would cause a rapid water pressure increase near the excavation face, which may be detrimental to fault zone stability. The research results can provide support for the safe construction of this project and reference for similar engineering studies.

Keywords: three-dimensional seepage; underwater tunnel; numerical simulation; water pressure; leakage

作者信息

商兆涛 $ ^{1} $，刘武 $ ^{2} $，夏琴 $ ^{1} $，尚金行 $ ^{2} $，王佐才 $ ^{2} $

(1. 芜湖市轨道(隧道)交通工程质量安全监督站, 安徽芜湖 241007; 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: 文章以芜湖城南过江隧道穿越江底富水断裂带为背景, 采用三维渗流分析方法对盾构隧道渗流进行有限元数值模拟, 系统分析开挖面相对断裂带位置、江水位、断裂带渗透性及其各向异性、泥水压力等因素的影响。研究表明: 隧道渗流受穿越断裂带影响, 开挖面掘进至断裂带时渗漏量与水压力降低幅度明显增大, 断裂带对水压力分布影响范围大于其宽度; 江水位越大, 隧道渗漏风险越高, 水位由 5.64 m 增至 12.21 m 将引起隧道渗漏量增大 13%。断裂带渗透性大小与各向异性均对隧道渗流产生影响, 断裂带渗透性及其各向异性比越大, 开挖面前端水压力下降幅度与开挖面渗漏量越大。开挖面泥水压力有效作用可降低对断裂带内水压力的扰动以及隧道渗漏风险, 但泥水压力突增会引起开挖面附近水压力迅速增大, 可能对断裂带稳定不利。该研究成果可为该工程安全施工提供支撑并为类似工程研究提供参考。

关键词: 三维渗流；江底隧道；数值模拟；水压力；渗漏量

Funding

国家自然科学基金资助项目（52278301）；安徽省自然科学基金资助项目（2208085ME153）

合肥工业大学学报(自然科学版)

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