逆作法施工中边墙与中间立柱差异沉降的实测研究

Measurement Study of Differential Settlement between Diaphragm Wall and Mid Column in Reserved Construction Method

逆作法施工具有有效控制基坑变形、保护环境、占用施工场地少以及对地面交通影响少等优点。逆作法不仅要考虑到施工中围护结构的内力、变形和稳定性,在软土地区还要考虑施工过程中结构差异沉降这一新问题。结构差异沉降的产生是因为土方开挖的卸载、结构自身刚度以及所受荷载的不同而引起的。文章对杭州地铁一号线武林广场车站端头井逆作法施工的实测资料进行了分析和归纳,对中间立柱之间以及立柱与围护地连墙之间在施工过程中的差异沉降进行分析和研究。

The reserved construction method of underground structure has many advantages which are controlling the deformation of deep foundation pit, environmental protection, occupying the less building space, having few influenceto traffic and so on.To reserved construction method we not only need to consider the interior stress, deformation and stability of the structure,but also need to consider the new problem of structure differential settlement under the building process in the soft soil area.Excavating soil and the structure which has different rigidities and bears different loads lead to structure differential settlement.This paper is based on the measurement data which are collected during the reserved construction in WuLin square station of the first line metro in Hangzhou.And the differential settlement of diaphragm wall and mid column is studied in this paper.