变位分配原理在十字交叉地铁站施工中的应用

摘要

Research and development of Changchun subway Jiefang Road transfer,to ensure the safety of construction and ground and underground pipelines,to provide technical support for similar projects.According to the principle of displacement allocation,using the combination of theoretical calculation and construction experience,According to the optimal construction scheme,the whole construction process of the transfer station is numerically simulated and the total settlement occurring in the actual construction is refined to the construction stage.The key steps in the construction of the transfer station are the construction phase of the main guide hole,the completion stage of the arch,the three stages of the single,the proportion of surface subsidence accounted for 21.41％,17.89％ and 41.01％ respectively.Cumulative of 24.80mm,51.89mm and 102.61mm,the total surface settlement monitoring value strictly controlled within 118 mm.The principle of displacement distribution has good practicability in the construction process of the main structure of the crossroads,is conducive to the construction safety control and management.%目的 制定长春地铁解放大路换乘车站主体结构分步施工沉降控制标准,以保证施工及地面建筑物和地下管线的安全,为类似工程提供技术支持.方法 依据变位分配原理,将理论方法与实践相结合,采用FLAC3D模拟分析换乘车站施工全过程,并将实际施工中出现的总沉降细化到各个施工阶段中.结果 在十字换乘车站施工中关键的三个步骤分别为主体导洞开挖阶段、顶拱扣拱完成阶段、开挖单层结构导洞阶段,以上三步的地表沉降分别占到地表总沉降的22.41％、17.89％和41.01％;在采用主体结构分步施工沉降控制标准的情况下,累计控制的以上三阶段的沉降量分别为25.52 mm、51.61 mm和103.05 mm,总地表沉降监测值严格控制在118 mm之内.结论 变位分配原理在十字交叉换乘车站主体结构的施工过程中具有较好的实用性,有利于施工安全的控制与管理.