典型软土地层不同端头形式管廊基坑的变形规律OA北大核心CSTPCD

In order to study the influence of different end forms on the deformation of foundation pits in soft soil areas,the horizontal displacement and surface settlement laws of the foundation pit enclosure structure were ana-lyzed based on the typical deep foundation pit project of Zhongshan Science City Pipe Gallery in soft soil areas.The results show that the horizontal displacement of the enclosure structure gradually increases from the pit angle and then tends to stabilize;the surface settlement around the foundation pit first increases and then decreases from the pit angle before stabilizing,and there are areas prone to collapse;the horizontal displacement of the founda-tion pit enclosure structure of the 90º symmetric end,120º asymmetric end,and 150º asymmetric end pipe gallery gradually increases from the pit angle,and tends to stabilize at 5.4He,8He,and 5.3He(He is the excavation depth of the foundation pit),respectively;the surface settlement of the 90º symmetric end,120º asymmetric end,and 150º asymmetric end pipe gallery foundation pit tends to stabilize after being 6He,8.3He,and 5.7He away from the pit angle,respectively.The range of easily collapsed areas is 1.0He～6.0He,3.57He～7.57He,and 2.14He～5.14He away from the pit angle,respectively.The research results provide a reference for controlling the deformation of foundation pit during the construction of pipe gallery foundation pit in soft soil area.