地铁换乘站无槽壁加固地下连续墙成槽施工数值分析

A Numerical Analysis of a Deep Diaphragm Wall Excavation for a Metro Transfer Station in the Conditions of There Being No Trench Wall for Reinforcement

以南通地铁1号线能达商务区站地下连续墙工程为背景,运用FLAC3D数值模拟软件,分析地下连续墙成槽施工过程对周边土体的影响,选取该工程标准槽段换乘区段,分析1 m、3 m以及5 m步长三序成槽开挖对槽体侧壁位移影响、不同泥浆重度护壁下的侧壁位移,以及不同开挖步幅对土体沉降的影响,为施工决策提供技术参考。

With the project of the deep diaphragm wall for the Nengda CBD station of Line 1 of Nantong Metro as the background,the effect of the construction process of the deep diaphragn wall excavation on the surrounding soil bodies is analyzed with the help of the numerical simulation software of FLAC3 D in the present paper,with the influence of the excavation step lengths of 1 m,3 m and 5 m on the displacement of the side wall,the displacenent of the side wall under the conditions of using differett-gravity slurry to retain the wall,and the effect of the different excavation step width on the settlement of the soil bodies respectively analyzed.The results of the analyses provide good reference for the decision-making of the construction.