Spatiotemporal evolution of slope deformation law of deeply-excavated canal over the middle route of South-to-North Water Diversion Project
LI Chunyi
JIA Pengzhen
ZHAO Hailiang
WEI Lei
DING Laizhong
HAN Bo
Abstract：In order to study the deformation law of the expansive soil slope in the deeply-excavated canal,a deformation monitoring technology combining PS InSAR and SBAS InSAR was used to process 88 Sentinel-1A orbit elevation image data from January 11,2017 to December 27,2019.The long-term deformation veloc-ity and cumulative deformation field of the slopes on both sides of the canal were obtained and analyzed,and the original soil composition was tested.The correlation between surface deformation and soil physical properties was analyzed,and the impact of rainfall on slope deformation was discussed.The results showed that the average annual deformation rate of the slope in the canal section was 10-25 mm/a,and the maxi-mum cumulative deformation was about 60 mm.The overall slope was in an elevated state.The main compo-nent of expansive soil in the lower undisturbed rock and soil layer of the experimental area was illite.Under the influence of rainfall,the slope repeatedly rose or sank,and the peak deformation was closely related to the rainfall during the rainy season,with a certain lag.The overall trend of slope deformation can be charac-terized by the regression centerline between the slope shape variables in the canal section and time.
Keywords：South-to-North Water Diversion Projectslope deformationspatiotemporal evolutiontime series InSARexpansive soil
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 76-85 )