上海地下变电站深基坑施工监测分析

UNDERGROUND TRANSFORMER SUBSTATION CONSTRUCTION MONITORING ANALYSIS IN SHANGHAI

软土地区深基坑周边往往建筑密集、地下管线众多,环境保护要求较高,必须进行严格的工程设计和施工,最大限度减少基坑施工对周边环境的影响。介绍了上海地下变电站深基坑工程的支护设计、施工和监测方案,并对主要监测结果作了详细分析。监测结果表明,基坑开挖引起的围护结构变形及对周边环境的影响具有明显的三维空间效应;围护结构变形、地表沉降、地下管线变形及邻近高架基础沉降主要发生在打桩和深层土体开挖阶段,开挖至坑底后,变形逐步趋于稳定。

Deep excavations in soft soil areas are usually surrounded by a lot of buildings. Protection of the surrounding environment is very strict as many underground utilities such as telephone, gas, water supply and drainage pipelines distributed around the excavated site. The design, construction and monitoring scheme of a deep excavation in Shanghai in detail. The monitoring results show that the is presented, and the main monitoring results are discussed retaining structure deformation induced by excavation and the impact on the surrounding environment has the three-dimensional spatial effect; retaining structure deformation, surface subsidence, deformation of underground pipelines and nearby elevated foundation settlement occurs mainly in piling and deep soil excavation phase, excavation to the bottom of the pit, deformation gradually stabilized.