土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (2): 101-105.

• 工程实录 • 上一篇    下一篇

钢管与钢板桩长短组合在地道基坑中的应用

何琪明1,赖允瑾2   

  1. （1.舟山市普陀山公路与运输管理局，浙江舟山 316111;2.同济大学地下建筑与工程系，上海 200092）
  • 收稿日期:2020-03-06 修回日期:2020-03-12 出版日期:2021-04-23 发布日期:2021-04-23
  • 作者简介:何琪明（1972-）,男，高级工程师，研究方向为公路交通工程的建设和管理。
  • 基金资助:
    浙江省交通厅2018科技计划项目（项目号2018040）

A Case Study of the Application of OU-CSP in a Deep Excavation of Underpass

HE Qiming1， LAI Yunjin2   

  1. (1.Zhoushan Highway and Transportation Administration Bureau, Zhoushan 316111;
    2.Department of Geotechnical Engineering, Tongji University, Shanghai 200092)
  • Received:2020-03-06 Revised:2020-03-12 Online:2021-04-23 Published:2021-04-23

摘要： 舟山市朱家尖某地道基坑长450 m，开挖深度0~8 m，对于5 m开挖深度以上的区段采用了钢管桩和U型钢板桩的”O-U-O”组合的组合板桩支护形式，其中钢管桩和U型钢板桩长度不一致，U型钢板桩12 m，钢管桩15 m或18 m，采用2道钢管支撑。基坑处于淤泥质地层，坑底采用三轴搅拌桩抽条加固。工程应用表明，这种OU组合板桩支护形式比SMW工法桩支护具有造价低、工期短的优点，同时由于组合板桩刚度大，变形小，换撑拆撑十分方便，特别适合地道狭长形基坑。


关键词: 深基坑, OU组合板桩, 下立交地道, 支护结构

Abstract: The proposed deep excavation for a highway underpass site in Zhujiajian of Zhoushan was 450m in length and its excavated depth varied from 0 to 8 meters. A combined sheet pile system with steel pipe piles and Usection sheet piles (OUCSP), in which the Usection piles are 12m long and the steel pipe piles are 15m or 18m long, respectively, has been used as the supporting structure with two layers of steel pipe struts for the excavation of the underpass structure in areas with the excavation depths less than 5 meters. The deep excavation site is located in peaty soft soils and was improved with deep mixing cement-soil columns. This application shows that OU-CSP has the advantages of cost effective, short construction schedule and much higher stiffness over other types of supporting structures such as SMW retaining wall. Due to above advantages, OU-CSP is feasible to the construction of long, narrow, and deep excavation such as that of highway underpass.

Key words: deep excavation, OU combined sheet pile, highway underpass, retaining wall

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