基坑开挖下邻近盾构隧道结构位移场变化研究  

Research on the Displacement Field Changes of Adjacent Shield Tunnel Structures under Excavation of Foundation Pits

作　　者：曹洋[1] 崔洋 曹文欣 Cao Yang;Cui Yang;Cao Wenxin(China Northeast Architectural Design&Research Institute Co.,Ltd.,Shenyang 110055,China;CSCEC Dongshe Geotechnical Engineering Co.,Ltd.,Shenyang 110055,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]中国建筑东北设计研究院有限公司,沈阳市110055 [2]中建东设岩土有限公司,沈阳市110055 [3]东北大学资源与土木工程学院,沈阳市110819

出　　处：《北方交通》2023年第8期82-85,90,共5页Northern Communications

摘　　要：不同基坑工程因其所处施工场地的地质条件各不相同,支护结构变形、坑外土体位移大小等变量也具有较大差异。文章设计了多影响因素正交试验,并结合数值模拟,分析了各影响因素对砂土地层深基坑开挖对旁侧盾构隧道的影响程度,而后针对不同基坑支护形式,开展了隧道外侧深层土体位移研究。研究结果表明:对盾构隧道左拱腰水平位移影响最大的为基坑开挖深度,所占比例为40.92%;对盾构隧道拱底竖向位移的影响最大的为基坑-隧道水平距离,所占比例为49.50%;通过分析数值模拟结果,得到了不同基坑支护形式下盾构隧道外侧深层土体位移场等值线图,为类似工程施工提供参考。Due to the different geological conditions of the construction site where different foundation pit projects are located,there are significant differences in variables such as support structure deformation and soil displacement outside the pit and so on.The orthogonal experiments with multiple influencing factors are designed and the degree of influence of each influencing factor on the excavation of deep foundation pits in sandy soil layers on the side shield tunnel is analyzed in combination with the numerical simulation.And the research on the displacement of deep soil mass outside the tunnel for different forms of foundation pit support is conducted.The research results show that:the excavation depth of the foundation pit has the greatest impact on the horizontal displacement of the left haunch of the shield tunnel,accounting for 40.92%;the horizontal distance between the foundation pit and the tunnel has the greatest impact on the vertical displacement of the arch bottom of the shield tunnel,accounting for 49.50%;contour maps of the displacement field of the deep soil mass outside the shield tunnel under different forms of foundation pit support are obtained by analyzing the numerical simulation results,so as to provide reference for similar engineering construction.

关 键 词：基坑 盾构隧道 正交试验 有限元模型 深层土体位移 

分 类 号：U452.11[建筑科学—桥梁与隧道工程]