Analysis of ground subsidence along Zhengzhou metro based on time series InSAR
- Vol. 26, Issue 7, Pages: 1342-1353(2022)
DOI： 10.11834/jrs.20211246
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摘要
针对郑州市地铁网络缺少长时间序列的地面沉降研究，本文基于永久散射体合成孔径雷达干涉测量PS-InSAR（Persistent Scatterers Interferometric Synthetic Aperture Radar）技术生成的长周期地面沉降数据分析了郑州市地铁沿线地面沉降的时空特征，并通过反距离内插等距化处理，基于长短期记忆网络LSTM（Long Short-Term Memory）模型对典型地铁站点地面沉降进行了预测与分析。研究结果表明：空间上，沉降路段主要集中在1号线和5号线的东段，最大沉降速率超过20 mm/a，且1号线沿线不均匀形变较为突出；时间上，不同区域PS点在时间序列上的变化有较大不同，沉降槽中心处沉降呈逐年扩大趋势。实验表明LSTM模型具有较高的预测精度，预测发现1号线市体育中心站南边河南省档案馆新馆北侧未来两年里仍将以大约0.5 mm/月的速率继续沉降，有必要对该站及其附近继续监测。
Abstract
As a mega city in central China, Zhengzhou is in a period of large-scale metro construction. The problem of ground subsidence along metro lines occurs during metro construction and operation. Thus, monitoring and analysis of ground subsidence along metro lines are important to ensure the safety of metro operation. However, the researches on long-time-series ground subsidence in the Zhengzhou metro network are lacking. Permanent scatterers–interferometric synthetic aperture radar (PS-InSAR) technology overcomes many shortcomings of traditional ground subsidence monitoring methods, such as high cost, limited monitoring range and points, and difficulties in long-term monitoring. Therefore, PS-InSAR technology is used to monitor the subsidence of the Zhengzhou metro network in this study.,35 Envisat ASAR images and 44 Sentinel-1 images are employed to obtain the surface deformation information of Zhengzhou City from February 2005 to October 2010 and from July 2015 to May 2019 via PS-InSAR technology. By extracting PS points in a certain range on both sides of the metro lines, the temporal and spatial characteristics of ground subsidence along Zhengzhou metro are subjected to statistical, profile, and overlay analyses. To address the unequal time interval of ground subsidence time series data caused by SAR image discontinuity, an equidistant processing method based on inverse distance interpolation is proposed, and the subsidence of a typical metro station is predicted and analyzed using the Long Short-Term Memory (LSTM) model.,Results show that the subsidence sections are mainly concentrated in the east of Lines 1 and 5, the maximum subsidence rate is more than 20 mm/a, and the maximum cumulative subsidence is about 80 mm. The overall deformation trend of Line 1 is similar to a parabola, and the uneven deformation is prominent. The changes in PS points in the time series differ in various regions. The subsidence trough near the Henan Orthopedic Hospital Station of Line 5 is basically symmetrical in space, and the subsidence at the center is expanding yearly. Experiments show that the LSTM model has high prediction accuracy, and the prediction results reveal that the north of the New Archives of Henan Province located in the south of Zhengzhou Sports Center Station will continue to settle at a rate of about 0.5 mm/month in the next two years. Hence, the station and its vicinity must be continuously monitored. This study confirms that PS-InSAR technology can meet the application needs of large-scale urban ground subsidence monitoring, and the results provide a scientific basis for the continuous dynamic monitoring of ground subsidence along Zhengzhou metro network and metro maintenance.
关键词
郑州地铁地面沉降PS-InSARLSTM预测分析
Keywords
Zhengzhou metroground subsidencePS-InSARLSTMprediction analysis
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