京津城际铁路(北京段)沉降监测及影响因素分析

Settlement Monitoring and Influencing Factor Analysis of Beijing-Tianjin Intercity Railway(Beijing Section)

利用干涉点目标分析技术对37景TerraSAR-X数据进行处理,从而准确地估计沿线区域的地表形变。此外,引入同期二等水准测量数据验证了计算结果可靠且精度较高;采用最大信息系数分析高铁的形变及其与影响因素之间的关系,将变形结果与收集的地下水、降水、可压缩层厚度等资料结合,定量描述其与沉降点之间的关系。结果表明,在观测期间,沿着高铁跨丰台区、东城区段年均沉降率小于10 mm/a,至朝阳区前段沉降率增大,至中段达40~60 mm/a,通州区年均沉降速率稳定;地面沉降与地下水位的变化有很好的响应,地下水开采量的增加和地下水位下降导致该地区的沉降量增加;地面沉降与地质构造有着一定的关系。确定沉降监测的重点区域,为铁路的安全运行提供决策支持。

In this paper,the 37-view TerraSAR-X data is used to study the data by using the interferometric point target analysis algorithm to accurately estimate the surface deformation along the line.In addition,the verification results are reliable and accurate by introducing the second-level leveling data of the same period.Using the maximum information coefficient to analyze the relationship between the deformation of high-speed railway and its influencing factors,and combining the deformation results with the collected groundwater,precipitation,and compressible layer thickness,the relationship between the above factors and the settlement point can be quantitatively described.The results show that during the observation period,the annual average settlement rate of the high-speed railway across Fengtai district and Dongcheng section is less than 10 mm/a,the annual average settlement rate to the front section of Chaoyang district is increased,and the middle section reaches 40~60 mm/a,entering Tongzhou district.The annual average settlement rate is stable.At the same time,the ground subsidence has a good response relationship with the drop of groundwater level.The increase of groundwater level and the drop of groundwater level lead to an increase in settlement in the area.At the same time,the ground subsidence has a certain relationship with the geological structure.This research can determine the key areas of subsidence monitoring,and provide decision support for the safe operation of high-speed railway.