基于时序InSAR的京津高铁北京段地面沉降监测

发布时间：2018-08-20 16:33

【摘要】：京津高铁是中国第一条高速运行的城际铁路,其安全运行对轨道的平顺性有着严格的要求。地面沉降,尤其是不均匀地面沉降会引起部分路基和桥梁变形,威胁着高速铁路的运营安全。合成孔径雷达干涉测量技术可以大范围监测地表形变,对高速铁路沿线地面沉降具有较好的监测能力。本文以45景高分辨率Terra SAR-X数据为基础,采用PS-In SAR技术监测京津高铁北京段沿线地面沉降,获取京津高铁北京段沿线地面沉降的分布信息,从动静载荷视角结合北京地区地下水、断裂带、地质条件和含水层系统介质等数据,综合分析高铁沿线不均匀地面沉降的原因,为京津高铁的安全运营提供技术支撑。研究结果表明:京津高铁北京段沿线地面沉降发展在空间上存在一定差异性,北京南站至十里河区间,年沉降速率小于10 mm/a;至十八里店区间,年沉降速率在10~40 mm/a范围内浮动;过亦庄站至东石村以东区间,最大年沉降速率达到90 mm/a;至永隆村以西,年沉降有所缓解,往东至坨堤村,沉降较为稳定,年沉降速率小于10 mm/a。地下水超采是沿线区域地面沉降的主要因素,动静载荷共同作用下对地面沉降产生一定的影响,沿线地面沉降一定程度上受到南苑—通县断裂带和旧宫断裂带构造控制,沉降量较大的路段位于粘土层较厚的大兴迭隆起。
[Abstract]:Beijing-Tianjin high-speed railway is the first high-speed intercity railway in China. Land subsidence, especially uneven land subsidence, will cause deformation of some subgrade and bridge, threatening the operation safety of high-speed railway. Synthetic Aperture Radar (SAR) interferometry can be used to monitor the surface deformation in a wide range and has a good ability to monitor the land subsidence along the high-speed railway. Based on 45 high resolution Terra SAR-X data, the ground subsidence along Beijing section of Beijing-Tianjin high-speed railway is monitored by PS-In SAR technology, and the distribution information of ground subsidence along Beijing section of Beijing-Tianjin high-speed railway is obtained. In order to provide technical support for the safe operation of Beijing-Tianjin high-speed railway, the data of fault zone, geological conditions and aquifer system media are analyzed synthetically to analyze the causes of uneven land subsidence along the high-speed rail line. The results show that the land subsidence development along the Beijing section of Beijing-Tianjin high-speed railway is different in space, the annual subsidence rate is less than 10 mm / a from Beijing South Railway Station to the Shili River section, and the annual settlement rate fluctuates in the range of 10 ~ 40 mm/a to Shilidian section. To the east of Dongshi Village, the maximum annual subsidence rate is 90 mm / a, and to the west of Yonglong Village, the annual settlement is alleviated, and to the east to Tuo Dike Village, the settlement is relatively stable, and the annual settlement rate is less than 10 mm / a. Groundwater overmining is the main factor of ground subsidence along the line, and the ground subsidence along the line is controlled to some extent by the structures of the Nanyuan-Tongxian fault zone and the old palace fault zone under the combined action of dynamic and dynamic loads, and the ground subsidence along the line is controlled to a certain extent by the structure of the Nanyuan-Tongxian fault zone. The section with large settlement is located in Daxing uplift with thick clay layer.
【作者单位】：首都师范大学水资源安全北京实验室;首都师范大学三维信息获取与应用教育部重点实验室;首都师范大学城市环境过程与数字模拟国家重点实验室培育基地;
【基金】：国家重点研发计划项目(2017YFB0503803) 国家自然科学基金项目(41201419、41671417)
【分类号】：P642.26;U238

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