深基坑临近地铁区间开挖影响分析及控制措施  

Analysis on influence and control measures of deep foundation pit excavation near subway section

作　　者：叶培锋 

机构地区：[1]福建省林业勘察设计院,福建福州350001

出　　处：《福建建设科技》2024年第5期56-59,共4页Fujian Construction Science & Technology

摘　　要：为了保障既有运营隧道安全,临近地铁区间隧道深基坑开挖引起的影响要采取一定的措施,控制在合理范围。本文以深基坑开挖对临近地铁区间的影响为目的进行数值模拟计算,并结合深基坑开挖过程中各项实际监测结果,评估采取措施的有效性。结果表明:深基坑开挖过程中,围护结构及既有地铁区间隧道的最大水平位移分别约12mm及4mm,均满足设计要求。围护结构最大水平位移位于一条直线,随着基坑开挖深度增加,最大水平位移稳定于基坑深度三分之二的位置。通过增加止水帷幕效果,充分利用结构间土层进行缓冲,围护结构最大水平位移减少10%。In order to ensure the safety of existing operating tunnels,certain measures should be taken to control the impact caused by deep excavation of tunnels near the subway section within a reasonable range.This article conducts numerical simulation calculations on the impact of deep foundation pit excavation on the adjacent subway section,and evaluates the effectiveness of the measures taken based on various actual monitoring results during the deep foundation pit excavation process.The main conclusions were as follows:during the deep foundation pit excavation process,the maximum horizontal displacement of the retaining structure and the existing subway section tunnel were about 12mm and 4mm,respectively,which meet the design requirements.The maximum horizontal displacement of the retaining structure was located in a straight line,and as the excavation depth of the foundation pit increases,the maximum horizontal displacement stabilizes at two-thirds of the depth of the foundation pit.By increasing the waterproof curtain effect and utilizing the spatial effect of excavation methods,the maximum horizontal displacement of the retaining structure is reduced by 10%.

关 键 词：隧道 深基坑 开挖 数值模拟 监测 

分 类 号：TU753[建筑科学—建筑技术科学] U231[交通运输工程—道路与铁道工程]