Influence of Different Supporting Forms on the Deformation of Special-Shaped Deep Foundation Pit

Abstract

Excavation deformation of foundation pit is closely related to the safety of foundation pit. This article takes the foundation pit of Jinan Yellow River Tunnel South Bank Auto Repair Factory Station as an example, and uses FLAC3D simulation to analyze the influence of two supporting schemes on the deformation of special-shaped foundation pit excavation. The specific conclusions are as follows: 1) The deep horizontal displacement of diaphragm wall and row pile increases with the deepening of foundation pit excavation depth, and the position of the maximum horizontal displacement gradually moves downward; The horizontal displacement curve of the deep layer of the diaphragm wall transits from "bow" to "cantilever", and the row of piles shows a "hook" change trend. 2) The surface settlement of the two schemes increases with the deepening of the excavation depth of the foundation pit, and the further the distance from the foundation pit, the smaller the settlement is; The row of piles + internal support scheme is in "hook shape". 3) Through the comparative analysis of numerical simulation and engineering monitoring data, it is verified that the ground connecting wall + internal support method is more stable in actual engineering applications.