（上海市政工程设计研究总院（集团）有限公司,  上海 200092）

［摘要］以面积达12.2万m2超大深基坑为工程背景，结合顺作、逆作和中心岛法的特点，提出了整体顺逆结合设计方法，详细介绍了其设计方案和施工工序，并着重讨论了该设计方法的关键技术措施，包括地下两层板代支撑、预留土坡、竖向支承系统。通过有限元数值模拟，对楼板刚度取值和洞口加固进行了分析，并与监测结果进行了对比。结果表明，该设计方法在降低工程造价和施工风险的同时，保护了周边环境，节约了一定工期，具有较好的经济效益和社会效益，为软土地区超大规模深基坑设计与施工提供了借鉴。

［关键词］超大深基坑； 顺逆结合法； 楼板代撑； 楼板大开洞； 软土地区； 一柱一桩

中图分类号：TU318文献标识码：A文章编号：1002-848X(2020)21-0121-05

Application of internal method combined bottom-up and top-down in super\|large deep foundation pit  engineering in soft soil area

KONG Weiyao

（Shanghai Municipal Engineering Design Institute(Group) Co., Ltd., Shanghai 200092, China）

Abstract:Based on a super-large deep foundation pit  engineering with an area of 122 000m2, the internal method combined bottom-up and top-down was put forward, combining the characteristics of bottomup, top-down and central part method. The design scheme and construction procedure of this method were introduced. The key technical measures were also  focused, including underground two-story floor support, reserved soil slope and vertical support system. Through the finite element numerical simulation, the value of the slab stiffness and the reinforcement of the entrance were analyzed, and numerical simulation results and  monitoring results were compared. The results show that this design method will not only reduce project cost and construction risk, but also protect surrounding environment and save a certain period of project time. On the account of the better economic and social benefits, this method can provide a reference for the design and construction of super-large deep foundation pit   in soft soil area.

Keywords:super-large deep foundation pit ; method combined bottom-up and top-down; floor support; floor with large hole; soft soil area; single column over single pile

作者简介：孔维耀，硕士，工程师，Email:kongweiyao@smedi.com。