带撑双排桩支护结构在深厚软土基坑中的应用  

Application of supporting structure featuring prefabricated steel supports and double-row piles in deep soft soil foundation pits

作　　者：陈品章 夏高响 夏伟 李华治 CHEN Pinzhang;XIA Gaoxiang;XIA Wei;LI Huazhi(Anhui Transport Survey&Design Institute Co.,Ltd.,Hefei 230011,China)

机构地区：[1]安徽省交通勘察设计院有限公司,安徽合肥230011

出　　处：《水运工程》2023年第8期170-175,共6页Port & Waterway Engineering

基　　金：安徽省交通运输重点科技项目(2021-KJQD-012)。

摘　　要：某船闸闸址下伏深厚软土,地质条件复杂,船闸基坑开挖深度较深。为满足支护结构和周边环境变形要求,兼顾船闸施工的经济性与安全性,拟在双排桩支护方案基础上增设2道装配式钢支撑。以装配式钢支撑与双排桩组合支护形式为研究重点,利用GTS-NX有限元软件,模拟船闸深基坑施工过程。监测数据和有限元分析结果表明:带撑双排桩支护结构水平位移特征、周边建筑物沉降特征与工程实测结果基本吻合。钢支撑可有效限制围护结构的水平位移,减少基坑开挖对周边环境的影响,用装配式H型钢支撑加固软土深基坑可行。Deep soft soil lies under the substratum of a ship lock,where the geological conditions are complex,and the excavation depth of the ship lock foundation pit is large.In order to meet the deformation requirements of the supporting structure and the surrounding environment and ensure the economy and safety of the ship lock construction,it is proposed to add two prefabricated steel supports into the double-row pile supporting scheme.This paper focuses on the combined support of prefabricated steel supports and double-row piles and uses the finite element software,namely GTS-NX to simulate the construction process of the deep foundation pit of the ship lock.The monitoring data and finite element analysis results show that the horizontal displacement characteristics of the supporting structure featuring prefabricated steel supports and double-row piles and the settlement characteristics of surrounding buildings are basically consistent with the measured results of the project.Steel support can effectively limit the horizontal displacement of the supporting structure and reduce the impact of pit excavation on the surrounding environment.Therefore,it is feasible to use prefabricated H-shaped steel supports to reinforce deep foundation pits in soft soil.

关 键 词：双排桩 基坑支护 装配式钢支撑 深厚软土 船闸 

分 类 号：U641.5[交通运输工程—船舶及航道工程]