Monitoring and Analysis of Ultra-wide and Deep Foundation Pit Deformation in Complex Environment

Abstract

Taking the deep foundation pit of Foshan Zongde Service Center as the research background, the on-site monitoring data of the deep horizontal displacement, supporting axial force, horizontal displacement of the wall and the settlement of the column pile during the excavation process of the deep foundation pit are analyzed. The results show that during the excavation process of the deep foundation pit, the envelope structure is basically not affected by the excavation of the soil within the pit after the excavation surface is less than 10m; the reasonable arrangement of the support position can effectively reduce the displacement amplitude of the wall body; encryption monitors the change of the axial force of the adjacent support, and prestresses the upper support to improve the safety of the foundation pit; the greater the depth of the foundation pit is, the uplift of the column under the combined action of the pile side frictional resistance and the support of ballast and self-weight - sedimentation rate. The larger the amount of change is, the more the ballast is applied to the support when the support is poured, the amount of rebound of the column is reduced, and the continuous excavation of the earth can be effectively reduced to reduce the peak of the column uplift and prevent the column from being unstable due to the large difference between the settlement and the uplift. Endanger the safety of the support system in the pit.