Influence of Pipeline Leakage on the Ground Settlement around the Tunnel during Shield Tunneling

Shield tunneling is widely used in urban subway tunnel construction. Old underground pipelines generally have small leakages that are difficult to find. The water leakage significantly reduces the stability of stratum, posing a threat safety shield Therefore, this study established 2D and 3D calculation models for analyzing law diffusion ground under pressure, influences pipeline range length on changes settlement during tunneling. model results show seepage mainly diffuses vertically gravity. As gradually reaches predetermined depth, simulation tend be consistent with test results. more accurate than theoretical solution predicting because it can consider repeated disturbances twin maximum surface increases extent range, main factor determining settlement. At interior ground, has greater impact areas strong large soil losses.