摘要
以某临近地铁隧道的软土基坑工程为背景,考虑地下水渗流作用下,运用有限元方法动态模拟基坑开挖过程,分析基坑变形以及对临近地铁隧道的影响,并对不同施工方案进行优化分析。研究得出:基坑开挖对邻近地铁隧道影响主要体现在近端隧道的水平变形上,可将其作为施工中隧道变形控制及预警指标;提出的5项控制措施均能减小地铁隧道变形,其中减小开挖深度和坑外降水效果最为明显,结合实际情况进行组合分析,选取合适的施工控制方案;地铁隧道处于对变形严格要求的运营阶段时,需辅助其他控制措施,如分块开挖等。
Based on the engineering practice of one pit construction in soft ground,the application of finite element method to simulate pit construction process was presented with the consideration of the seepage of groundwater. The deformation of foundation pit and the excavation affection on metro tunnels were analyzed in detail. In addition,the deformation results of different construction schemes were compared. Some conclusions have been drawn： the excavation affection on metro tunnels mainly reflects in horizontal deformation of the nearer tunnel,which can be determined as the control and early-warning index for tunnel deformation; the proposed 5 control measures can reduce the deformation of metro tunnels,and the control effect of excavation-depth reduction or outside dewatering measure are the most apparent; the composite analysis is carried out to select the appropriate construction control scheme,considering the actual conditions. Metro tunnels in the operation stage are very strict in the deformation restriction. Therefore,some assistant measures such as block excavation should be taken.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2015年第5期33-39,共7页
Journal of Chongqing Jiaotong University(Natural Science)
关键词
隧道工程
地铁隧道
施工影响
数值模拟
方案优化
tunnel engineering
metro tunnel
construction effect
numerical simulation
scheme optimization
