富水砂层中地下连续墙施工槽壁稳定性及变形研究分析

Study on Stability and Deformation of Diaphragm Wall Panel in Water Rich Sand Layer

泥浆护壁是轨道交通车站围护结构地下连续墙成槽质量的关键所在。整体失稳及局部失稳是地下连续墙在富水砂层施工中的主要破坏形式。结合南昌轨道交通3号线柏岗站富水砂层地下连续墙施工实际,采用Plaxis软件建立模型,分析其成槽施工阶段的槽壁变形特征和稳定性,找出南昌地区富水砂层中地下连续墙槽壁变形及地表沉降的规律,印证了施工现场泥浆性能参数及土体应力变化的规律。

During the construction of rail transit underground station, the excavation is filled with bentonite slurry to support the wall of the excavation. The overall and local instabilities of excavation are the main diseases of diaphragm wall in water rich sandy layer. The Baigang Station of Nanchang Rail Transit Line 3 is in the waterrich sandy layer. The Plaxis model was established to analyze the deformation characteristics and stability of panel during excavation and to find the law of panel deformation and ground settlement in Nanchang's water-rich sandy layer, which confirms the slurry performance parameters in-situ and soil stress variation law.