京津冀地区高速铁路沿线区域地表沉降监测及时序演化态势分析

为探测京津冀地区高速铁路沿线区域的不均匀沉降,利用基于合成孔径雷达干涉的干涉点目标时序分析技术,借助C波段SAR卫星序列在2015年11月至2018年3月间获取的51景降轨影像数据,提取研究区域的地表形变信息,结合地下水的动态变化及人类活动相关资料对沉降漏斗的演化态势进行归因性分析,并对该区域高速铁路沿线地表沉降监测及时序演化态势进行分析。结果表明:研究区域的年沉降速率为20~206mm·a^-1,漏斗中心最大累积沉降量达248mm,其中,区域内3条高铁沿线均存在明显的沉降,沉降速率均超过100mm·a^-1,最大值位于高铁路线的雄安县段,漏斗中心沉降速率达185mm·a^-1,累积沉降量为200mm;研究区域的整体沉降趋势稳定,沉降主要归因于人类活动,而高速铁路沿线的沉降与地下水开采密切相关。

Ground Settlement Monitoring and Time-Series Evolution Situation Analyzing along High Speed Railway in Beijing-Tianjin-Hebei Region

In order to detect the uneven settlement along the high speed railway in Beijing-Tianjin-Hebei region,using the time-series analysis technique of interference point target based on InSAR,with the help of the image data of 51 scenes with orbit reduction acquired by the C-band SAR satellite sequence from November 2015 to March 2018,the ground deformation information of the study area was extracted.Combined with the dynamic change of groundwater and the related data of human activities,attribution analysis was carried out on the evolution situation of settlement funnel,and the ground settlement monitoring and time-series evolution situation along the high speed railway in this region were analyzed.Results show that the annual settlement rate of the study area is 20~206 mm·a^-1,and the maximum cumulative settlement in the center of the funnel is 248 mm.Among them,there are obvious settlements along the three high speed railways in the area,the settlement rate exceeds 100 mm·a^-1,and the maximum value is located in the Xiongan county section of the high speed railway line.The settlement rate in the center of the funnel is 185 mm·a^-1,and the cumulative settlement is 200 mm.It is found that the overall settlement trend of the study area is stable,and the settlement is mainly attributed to human activities,and the settlement along the high speed railway line is closely related to groundwater exploitation.