Investigation of water leakage defects in shield tunnels and study of novel material grouting for prevention and control
ZHANG Tao
CAO Yongna
TU Xiongwei
ZHAO Shufeng
LI Wenqiu
YE Yuhang
YING Haokang
Abstract：Based on field investigations of leakage defects in a shield tunnel section of Jinan Metro Line 6,this study conducted statistical and in-depth analysis of leakage types,distribution characteristics,and their root causes.Addressing the issue of secondary leakage following cement-based grouting,the permeability,injectability,and expansive property were identified as key indicators to select a novel acrylic resin grout.The results revealed that water seepage dominates leakage incidents(74%),with segment joints(83%),particularly circumferential joints,being the predominant leakage locations,highlighting them as the critical focus for waterproofing;The acrylic resin grout exhibits excellent injectability(capable of penetrating micro-cracks as fine as 0.05 mm with a permeability of 2.205×10-10 cm2)and high water-absorption expansion ratio(187%),enabling effective sealing of leaks,and making it well-suited for treating fine crack seepage in humid environments.
Keywords：shield tunnelingwater leakageacrylic resingrouting
Publication Date：2025-12-25
Online Publishing Date：2026-01-13(First online date of this platform, not the publication date of the document)
Pages：6( 128-133 )