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天津地铁5、6号线宾馆西路地铁站地下连续墙施工区域周边建筑林立、管线密集,其成槽面临极大挑战。采用数值计算分析软件,选取典型的紧邻3幅地下连续墙对该地下连续墙成槽过程中的周边土地受力与变形机理进行探讨。计算结果表明,采用泥浆护壁进行超深地下连续墙成槽开挖时,超深地下连续墙侧向卸荷效应显著,且槽段周围土体的应力重分布明显;泥浆护壁阶段槽壁发生面向槽段内的侧向变形,同时在地面发生较大的沉降变形;混凝土浇筑后地面沉降变形会相应变小,但局部发生隆起,这主要源于侧向应力和槽壁反方向变形的作用。
There are lots of buildings around the construction area of the diaphragm wall of the underground subway station of Metro Line 5 and Line 6 in Tianjin Metro Line 5 and 6. Using numerical calculation and analysis software, the typical adjacent vertical diaphragm wall is selected to discuss the stress and deformation mechanism of surrounding ground during the process of forming the underground continuous wall. The calculated results show that the lateral unloading effect of the ultra-deep underground continuous wall is significant when using the slurry retaining wall for trench excavation, and the stress redistribution of the soil around the trenches is obvious. Lateral deformation in the trough section and large settlement deformation on the ground at the same time. The settlement of ground subsidence will be correspondingly smaller after concrete pouring, but local uplift occurs mainly due to the lateral stress and the deformation in the opposite direction of the groove wall.