About the author:

1. Beijing Uni,Construction Group Co., Ltd., Beijing 100101, China;2. School of Civil Engineering and Architecture, Anhui University of Science and Technology,Huainan, Anhui 232001, China

Abstract:

Aiming at the difficulty of controlling the jacking attitude during the jacking process due to theweak stratum such as silt fill, fine silt and silt, a tool pipe attitude adjustable jacking system wasdeveloped to control the elevation deviation and midline deviation of the test section within -16 —— 6mmand 2 —— 16mm respectively. A large,diameter manual pipe jacking active retractable support device wasdeveloped to provide a safe working space for the removal of underground obstacles in front of thejacking. The numerical simulation results show that the surface settlement is affected by the groutingpressure during pipe jacking construction. When the grouting pressure is 0.1MPa, the surface settlementcontrol effect is good. Along the jacking direction, the ground settlement displacement increases graduallyand tends to be stable. The lateral displacement and settlement curve of the surface along the horizontaldirection presents a normal distribution law, and the lateral disturbance range of the soil is -10 —— 10m.During pipe jacking construction, the driving load on the ground has little effect on the lateraldisplacement of the soil layer, but aggravates the vertical displacement of the soil layer.