摘要
研究目的:深基坑降水势必引起基坑周围环境沉降。针对京沪高铁天津西站站房深基坑紧邻既有运行铁路线的难点,采用三维渗流模型模拟基坑内外渗流场,选用有效的降水设计方案,保证基坑开挖期间安全及既有高铁的正常运行,并分析沉降监测数据,为类似工程积累宝贵的经验。研究结论:在深大基坑的降水设计中,必须将工程地质、水文地质条件和基坑的围护体系结合起来,选取合理的水文参数,进行详细的三维渗流分析,才能保证降水方案的合理、有效;降水运行必须严格执行设计方案中的运行要求,做到"按需降水,动态控制",尽可能减少承压水位降深,进而有效控制坑边路基沉降量,确保铁路线的正常运行。
Research purposes： Dewatering from deep foundation pit will certainly arouse the subsidence of surrounding environment.According to the condition that the deep foundation pit of the building of Tianjin West Station of Beijing-Shanghai High-speed Railway was adjacent to the existing railway line,a three-dimensional seepage model was used to simulate the seepage field inside and outside the deep foundation pit and the effective dewatering design scheme was adopted to ensure the safety of excavation of deep foundation pit and the traffic of existing railway.At the same time,the monitored data on subsidence were analyzed for providing the reference to the similar works.Research conclusions：In order to ensure rationality and validity of a dewatering design,the dewatering design must consider engineering geological conditions,hydraulic geological conditions and foundation bracing system to select reasonable hydrological parameters and make analysis of seepage flow with three-dimensional seepage model.The dewatering should be conducted strictly according to the dewatering design scheme with immediate dewatering and dynamic control to reduce dewatering depth of pressure-bearing water for effective controlling the subgrade subsidence around the foundation pit as much as possible and ensuring the railway traffic.
出处
《铁道工程学报》
EI
北大核心
2010年第9期1-4,共4页
Journal of Railway Engineering Society
关键词
深基坑
降水
三维渗流模型
管井
沉降监测
deep foundation pit
dewatering
three-dimensional seepage model
tube well
subsidence-monitoring
