Monitoring and analysis of ground settlement during pipe roof construction of pipe-jacking groups in soft soil areas

Based on the example project of the pipe roof section of Guiqiao Road Station on Shanghai Line 14, the ground settlement of the pipe roof is monitored during pipe-jacking construction process. At the same time, the influences of pipe-jacking group construction on the ground settlement are analyzed, and the methods for calculating the water pressure and soil pressure are discussed. According to the actual working conditions and the monitoring data of the jacking process, the reasons for the influences of the pipe-jacking construction on the ground are analyzed, and the corresponding control measures are proposed. Some conclusions are drawn as follows: (1) The maximum ground settlement caused by the pile jacking construction occurs in the area outside the reinforcement zone. (2) The calculation of the frontal soil pressure using water and soil is more in line with the actual situation in this project. (3) The factors affecting the ground deformation during the pipe jacking construction process mainly include the front cabin pressure, the jacking speed, the tightness of the hole, the pipe friction and the synchronous grouting.