太仓市基坑工程中灌注桩、钢板桩及SMW工法桩支护结构监测对比分析  

A Comparative Analysis of Monitoring Results for Cast-in-Place Pile,Steel Sheet Pile,and SMW Columns in the Supporting Structures in Basement Excavation Projects in Taicang City

作　　者：韦成 WEI Cheng(Taicang Three Gorges Urban Comprehensive Pipe Gallery Construction Co.Ltd.,Suzhou 215400)

机构地区：[1]太仓市三峡城市综合管廊建设有限公司,江苏苏州215400

出　　处：《土工基础》2024年第6期1099-1102,共4页Soil Engineering and Foundation

摘　　要：基坑工程中不同的支护结构类型在相同的工程条件下往往有不同的表现,以太仓某综合管廊基坑工程为例,对比灌注桩、钢板桩及SMW工法桩三类支护结构,通过对基坑围护顶部的竖向位移、支护桩深层水平、以及周边地表的沉降结果进行分析发现:SMW工法桩和灌注桩的变形时空分析规律基本一致,SMW工法桩比钻孔灌注桩刚度要小,桩体变形相对较大,拉森钢板桩在当前开挖深度条件下表现最差;对周边环境影响方面SMW工法桩较灌注桩影响小,同时受现场施工等条件等限制,时间跨度因素对观测有一定影响,拉森钢板桩在当前软弱土层条件下已经达到挡土的极限,周边土体沉降变化量在观测期间发生突变,对周边环境的影响最大,而在桩顶竖向位移方面三者表现相近。Different types of supporting structures in the deep excavation projects often exhibit different behaviors even under the same engineering conditions.This paper presents a comprehensive pipe gallery deep excavation project in Taicang.This article compares three types of supporting structures:cast-in-place concrete piles,steel sheet piles,and Soil Mixing Wall columns.Through analysis of the vertical displacement of the top of the deep excavation supporting structures,the deep horizontal level of the support piles,and the settlement results of the surrounding ground surface,it is found that the deformation analysis of the SMW retaining structures and the cast-in-place concrete piles are basically the same.The SMW retaining structures have lower stiffness than the drilled cast-in-place concrete piles,and the deformation of the pile shaft is relatively larger.The Larson steel sheet piles perform the worst under the current excavation depth conditions.In terms of the impact on the surrounding environment,the SMW retaining structures have a smaller impact than that of the cast-in-place concrete piles.At the same time,due to the limitations such as the on-site construction conditions,time span factors have a certain impact on this observation.The Larson steel sheet piles have reached the limit of the retaining soil under the current weak soil conditions,and the settlement change of the surrounding soil has undergone a sudden change during the observation period,which has the greatest impact on the surrounding environment.In terms of the vertical displacement at the top of the pile,the three types of supporting structures perform similarly.

关 键 词：基坑工程 支护结构 形变扰动 对比分析 

分 类 号：TU473[建筑科学—结构工程]