基于升降轨InSAR技术的砀山县地面沉降监测与分析

Monitoring and analysis of land settlement in Dangshan County based on ascending and descending InSAR technology

针对皖北平原区地面沉降监测网络尚不完善的现状,本文以砀山县为研究区,采用升降轨异源时序合成孔径雷达干涉测量(InSAR)技术监测,获取该区域2017年5月—2020年12月间的地面沉降信息,并对其时空发育特征及研究区内铁路工程的基础结构稳定性进行了详细分析。结果表明,研究区监测时段内存在严重的沉降漏斗,中心处沉降速率超过60 mm/a,且主要集中在城区;此外,受地面沉降影响,陇海铁路和徐兰高铁部分路段出现不同程度的形变病害,最大沉降速率值分别超过25 mm/a和12 mm/a,需引起关注。为了验证所获取沉降信息的可靠性,对升降轨异源监测成果进行了相关性分析,通过对比发现二者的相关系数达到0.95,具有较高的一致性。

As to the real situation that the land settlement monitoring network in the plain area of Northern Anhui is not perfect,Dangshan County is taken as the study area,and the land settlement information from May 2017 to December 2020 in this area is monitored and obtained by using the heterologous time series InSAR of the ascending and descending.The temporal and spatial development characteristics and the infrastructure stability of railway engineering in this area are analyzed in details.The results show that there is a serious settlement funnel in the monitoring period in the study area,and the settlement rate in its center is more than 60 mm/a,which is mainly concentrated in the urban area.In addition,affected by land settlement,some sections of Longhai Railway and Xulan High-speed Railway have different deformation diseases,and the maximum settlement rate exceeds 25 mm/a and 12 mm/a respectively,it really needs to pay more attentions.In order to verify the reliability of the obtained settlement information,the correlation analysis of heterogeneous monitoring results of ascending and descending is carried out.By comparison,it is found that the correlation coefficient of the two is 0.95,they are highly consistent.