土工基础

›› 2017, Vol. 31 ›› Issue (1): 8-13.

• 工程实录 • 上一篇    下一篇

组合式非闭合支撑体系在软土浅基坑工程中的应用及分析

邵冬亮 1,王 龙 1,施锡林 2,李 志 1   

  1. (1.国网山东省电力公司经济技术研究院，济南 250031；
    2.中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室，武汉 430071）
  • 收稿日期:2016-02-01 修回日期:2016-02-15 出版日期:2017-02-20 发布日期:2017-02-24
  • 作者简介:邵冬亮（1985-），男，工程师，研究方向为岩石力学与工程。

Application and Analysis of a Combined Unclosed Rake System for Shallow Foundation Excavation in Soft Soils

SHAO Dongliang1, WANG Long1, SHI Xilin2, LI Zhi1   

  1. (1.State Power Grip, Shandong Electric Power Engineering Consulting Institute Co. Ltd., Jinan 250031;
    2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science, Wuhan, 430071)
  • Received:2016-02-01 Revised:2016-02-15 Online:2017-02-20 Published:2017-02-24

摘要： 开挖深度在7 m以下的软土浅基坑可以根据具体工程条件分别使用钢筋混凝土支撑和钢管支撑、型钢斜抛撑，形成非闭合式支撑体系，通过多种支护方式的组合，完成基坑开挖围护工程。通过上海某软土浅基坑的分区分块组合式设计，对组合式非闭合支撑体系的工程应用进行介绍，分析了钢筋混凝土支撑和钢管支撑以及型钢斜抛撑各自的适用范围和设计要点，基坑设计可根据各个部位的工程情况，进行水泥土搅拌桩重力墙、SMW工法桩等板式围护结构的平面组合式围护体系。通过支撑部位的PLAXIS数值模拟和开挖过程位移监测，对软土基坑的变形特点进行分析和总结，为软土地区类似的大面积浅基坑工程设计提供相关参考和工程经验。

关键词: 钢管支撑, 钢筋混凝土支撑, 非闭合式支撑体系, 淤泥质粘土

Abstract: In the selection of the suitable supporting systems for the deep excavation supporting for the excavation depth less than seven meters, several rake systems are available. They are: reinforced concrete rakes; steel pipe rakes; rolled steel rakes; or the unclosed raking system from combination of above methods. This paper presents a case history of utilizing an unclosed rake system that from the combination of supporting methods used in various excavation areas in a deep excavation in Shanghai soft soils. Following an introduction of the overall project excavation support information, the application of various rakes, such as, reinforced concrete, steel pipe and rolled steel, as well as their critical design aspects are presented. The vertical face of the excavation could be gravity wall consisting of soilcement mixed columns, soilcement mixed wall (SMW). The paper also presents the predicted deformation in the supporting system using numerical analysis by PLAXIS. The predicted deformation results are comparable to the monitored data.

Key words: Steel Pipe Strut System, Reinforced Concrete Strut System, Unclosed Supporting System, Mucky Soft Soils