邻近基坑同期施工相互影响分析  

Analysis of mutual influence during simultaneous construction of adjacent foundation pits

作　　者：陈帅 胡海波[2] 龚晓南[2] 过锦 周佳锦 CHEN Shuai;HU Haibo;GONG Xiaonan;GUO Jin;ZHOU Jiajin(Municipal Engineering Company of China Railway Tunnel Group Co.,Ltd.,Hangzhou 310030,Zhejiang,China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China;Geotechnical Research Institute,Ningbo University,Ningbo 315211,Zhejiang,China)

机构地区：[1]中铁隧道局集团有限公司市政工程公司,浙江杭州310030 [2]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [3]宁波大学岩土工程研究所,浙江宁波315211

出　　处：《地基处理》2025年第2期171-176,共6页Journal of Ground Improvement

基　　金：国家自然科学基金项目(52078457)。

摘　　要：基于实际工程背景,采用Plaxis 2D有限元软件建模,将数值结果与实测数据进行对比,验证了数值模型及所取参数的可靠性。以此为基本模型,进一步分析了先深后浅、先浅后深及同步开挖3种开挖顺序对围护结构变形的影响,同时分析了两基坑不同间距以及坑间超载对围护结构变形的影响。主要结论有:(1)先浅后深的开挖顺序对于浅基坑是最不利的,而开挖顺序的变化对深基坑围护结构变形的影响较小;(2)当间距超过2.0HB(浅基坑的开挖深度)时,可认为两基坑的相互影响已经很小;(3)超载主要影响浅基坑的围护结构变形,对深基坑围护结构变形的影响较小。Plaxis 2D finite element software was used to establish a numerical model based on an actual engineering project.And the numerical results were compared with the measured data to verify the reliability of the numerical model and the selected parameters.Based on the model,further analyses were conducted to investigate the effects of three different excavation sequences on the deformation of the retaining structure,including deep excavation followed by shallow excavation,shallow excavation followed by deep excavation,and synchronous excavation.The main conclusions are as follows:(1)The shallow-first-then-deep excavation sequence is the most unfavorable for shallow foundation pit,while changes in the excavation sequence have a minor impact on the deformation of the retaining structure of the deep foundation pit.(2)The mutual influence between the two foundation pits can be ignored when the spacing exceeds 2.0HB(where HB is the excavation depth of the shallow foundation pit).(3)The overload primarily affects the deformation of the retaining structure of the shallow foundation pit,with a minor impact on the deformation of the retaining structure of the deep foundation pit.

关 键 词：邻近基坑 同期施工 有限元 超载 基坑间距 

分 类 号：TU473.2[建筑科学—结构工程]