Research on land subsidence using time-series InSAR technology in loess fill area

doi:10.13474/j.cnki.11-2246.2021.0262

Abstract

Abstract: Geotechnical engineering such as “cutting hills and filling ditches to build land” is not uncommon in collapsible loess gully areas. It is a great significance to known the subsidence of the fill area. 56 scenes of TerraSAR-X StripMap mode images were collected from November 2017 to December 2020. The time series InSAR technology is used to monitor the subsidence of a collapsible loess fill foundation project in northern Shaanxi. The subsidence measurement results of 3 benchmarking points are compared to verify the monitoring accuracy of the InSAR results. The results show that the surface of the fill area is dominated by subsidence, and the surface of the excavation area is dominated by uplift. There is a relatively obvious surface subsidence in the study area, which is located in the fill area near the fill-excavation boundary line. The subsidence rate range is -40~-20 mm/a. The maximum subsidence rate is -49.9 mm/a, and the cumulative subsidence is 151.6 mm. the time series InSAR subsidence results are in good agreement with the field leveling results. The error in the vertical subsidence rate is 1.8 mm/a, indicating InSAR technology has good application value in deformation monitoring of collapsible loess fill and excavation area.

Key words: collapsible loess fill area, terraSAR-X, time-sereis InSAR, land subsidence

CLC Number:

P258

WANG Jianye, LIANG Xiaolong, JIN Xi, BAI Zechao, QI Erheng. Research on land subsidence using time-series InSAR technology in loess fill area[J]. Bulletin of Surveying and Mapping, 2021, 0(8): 158-161.

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