土工基础

›› 2017, Vol. 31 ›› Issue (5): 537-542.

• 工程实录 •    下一篇

双排桩留土后开挖在武汉长江一级阶地深大基坑中的应用

郭 运，马 郧，刘佑祥，倪 欣，李 松，朱 佳   

  1. （中南勘察设计院(湖北)有限责任公司，武汉 430071）
  • 收稿日期:2016-11-04 修回日期:2016-12-02 出版日期:2017-10-20 发布日期:2017-10-29
  • 作者简介:郭运(1985-)，男，国家注册一级建造师，工程师，研究方向为深基坑工程设计与研究。 通讯作者：马郧(1970-)，男，博士，教授级高级工程师，研究方向为岩土工程勘察、深基坑工程设计与研究。
  • 基金资助:

    武汉市“黄鹤英才（专项）计划”资助项目（文号武人才［2014］10）；武汉市城建委科研项目（No.201545，文号武城建［2015］191）

Application of Double-Row Piles withReserved Soil in the PassiveZonein a Large Deep Excavation inthe First Terrace of Yangtze River in Wuhan

GUO Yun, MA Yun, LIU Youxiang, Ni Xin, LI Song,  ZHU Jia   

  1. (Central Southern Geotechnical Design Institute Co., Ltd., Wuhan 430071)
  • Received:2016-11-04 Revised:2016-12-02 Online:2017-10-20 Published:2017-10-29

摘要： 以武汉凯德广场古田项目为例，主要介绍了双排桩结合坑内留土后开挖在武汉长江一级阶地深大基坑中的应用。该工程采用盆式开挖，中心岛法施工，利用主体结构设置反支撑后清除坑内留土。该支护形式可有效避免大面积内支撑的设置，土方挖运方便，节省工期显著。工程监测数据表明，留土对双排桩前桩水平位移约束明显，较单纯使用双排桩有效提升了支护体系抵抗变形能力，桩身变形及基坑周边建（构）筑物沉降控制在合理范围内。该项目的成功为双排桩结合留土后开挖在类似工程中的应用提供了有益的参考。

关键词: 深基坑, 双排桩, 留土后开挖

Abstract: The DoubleRow Pile with Reserved Soil in the Passive Zone technique was used in the supporting system for Wuhan Capitalmall Westgate large deep excavation project, which is in the first geological terrace of Yangtze River. Soils along the perimeters of the footprint was excavated first. When the foundations for the main structures were constructed, the remain soil in the center of the excavation was then removed by using the reactions provided by the superstructure foundations. This supporting system can effectively reduce the amount of internal supports and provide larger working zones for the soil excavation and hauling. The construction monitoring data indicate that the soils reserved in the passive zone have an obvious constraint to the lateral deflection of front row piles. In general, the the deformations in both the supporting structures and in adjacent structures were acceptable.

Key words: Deep Excavations, Double-Row Piles, Soil Reserved in the Passive Zone