土岩复合地层中深基坑开挖对邻近管线变形影响分析  

Analysis on influence of deep foundation pit excavation in soil-rock composite stratum on deformation of adjacent pipelines

作　　者：焦宁 丁建文[1] 吉锋 郭康 廖赵胜 Jiao Ning;Ding Jianwen;Ji Feng;Guo Kang;Liao Zhaosheng(School of Transportation,Southeast University,Nanjing 211189,China;The Eastern Route of South-to-North Water Diversion Project Jiangsu Water Source Co.,Ltd.,Nanjing 210029,China;Hangzhou Harmony Cloud Technology Co.,Ltd.,Hangzhou 310023,China)

机构地区：[1]东南大学交通学院,南京211189 [2]南水北调东线江苏水源有限责任公司,南京210029 [3]杭州谐云科技有限公司,杭州310023

出　　处：《东南大学学报（自然科学版）》2022年第2期229-236,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51978159);"十二五"国家科技支撑计划资助项目(2015BAB07B06)。

摘　　要：为探究土岩复合地层中深基坑开挖对邻近管线变形的影响规律,开展了土岩复合地层中深基坑开挖的现场监测和数值模拟研究.以南京地铁一号线北延工程二桥公园站车站基坑为工程依托,基于现场实测数据进行了管线沉降变形分析,并使用PLAXIS 3D有限元分析软件进行数值模拟,揭示了管线与基坑间距、管线埋深等因素对管线变形的影响规律,并定量分析了各种因素的影响程度.结果表明:管线的不均匀变形主要发生在基坑端角部20%开挖长度范围内;与单一土层相比,在上土下岩的土岩复合地层中进行基坑开挖对邻近管线沉降变形影响相对较小;管线竖向位移和水平位移与管线埋深、管线与基坑间距成负相关,与基坑开挖深度成正相关;相对而言管线与基坑的间距对管线变形影响最大,管线埋深次之,基坑开挖深度影响相对较小.To investigate the influence rule of deep foundation pit excavation on adjacent pipeline deformation in soil rock composite stratum,field monitoring and numerical simulation of deep foundation pit excavation in soil-rock composite stratum were carried out.Based on the foundation pit of Second Bridge Park Station of Nanjing Metro Line 1 North Extension Project,the settlement and deformation of the pipeline were analyzed based on the field measured data,and the numerical simulation was carried out by using PLAXIS 3 D finite element analysis software,revealing the influence rule of the distance between the pipeline and the foundation pit,the pipeline buried depth and other factors on pipeline deformation.The degree of the influence of various factors was quantitatively analyzed.The results show that the non-uniform deformation of the pipeline mainly occurs in the 20%of the excavation length of the corner end of the foundation pit.Compared with the single soil layer,the influence of foundation pit excavation on the settlement deformation of adjacent pipelines is relatively small in the soil-rock composite stratum with upper soil and lower rock.The vertical displacement and the horizontal displacement of pipeline are negatively correlated with the buried depth of the pipeline and the distance between the pipeline and foundation pit,and are positively correlated with the excavation depth of the foundation pit.The distance between the pipeline and the foundation pit has the greatest influence on pipeline deformation,followed by the buried depth of pipeline,and the excavation depth of foundation pit has the less influence on pipeline deformation.

关 键 词：深基坑开挖 土岩复合地层 管线变形 数值模拟 

分 类 号：TU45[建筑科学—岩土工程]