如通苏湖城际铁路桥梁上跨闸站安全影响评估分析

Assessment and Analysis on Safety Impact of Intercity Railway Bridge Spanning Sluice Gate Station

摘要:

新建如东经南通苏州至湖州城际铁路采用桥梁跨越在建阳安塘闸站，为确保城际铁路桥梁施工、运营期间对闸站安全及闸站运营、维护作业对城际铁路桥梁的影响，需对城际铁路桥梁上跨闸站进行安全影响评估，分析闸站、城际铁路桥梁变形。首先，采用经验分析法、风险交流法和专家调查法开展城际铁路桥梁、闸站在施工、运营期间的风险源定性识别，并结合规范确定评估标准；其次采用有限元数值仿真定量分析城际铁路桥梁基坑开挖、主体结构施工、列车运营对闸站结构竖向、水平变形影响，闸站运营、河道淤积及清淤对城际铁路桥梁结构竖向、水平变形影响，城际铁路运营工况叠加河道水位变化对闸站影响等工况；最后提出变形监测要求及监测控制值。

Abstract:

The bridge used by the newly built Rudong Intercity Railway from Nantong, Suzhou to Huzhou spans Yangantang Sluice Gate Station under construction. To ensure the safety of sluice gate station during the construction and operation of intercity railway bridge, and to analyze the impact of sluice gate station operation and maintenance on the intercity railway bridge, it is necessary to carry out the safety impact assessment of intercity railway bridge spanning the sluice gate station, which analyzes the deformation of sluice gate station and intercity railway bridge. Firstly, the empirical analysis method, risk exchange method and expert investigation method are used to conduct the qualitative identification of risk source during the construction and operation of intercity railway bridge and sluice gate station, and the assessment criteria are determined according to the specifications. Then, the finite element numerical simulation is used to quantitatively analyze the impacts of the foundation pit excavation for intercity railway bridges, the main structure construction and the train operation on the vertical and horizontal deformations of sluice gate station structure, the impacts of sluice gate station operation, river sedimentation and dredging on the vertical and horizontal deformations of intercity railway bridge structures, and the impacts of intercity railway operation plus the changes of river water level on sluice gate station. Finally, the monitoring requirements and control values of the deformations are proposed.