光学与雷达遥感融合的铁路边坡三维形变监测与评价研究OA

[Objective]The safety of cutting slopes has always been a key concern in railway engineering.In recent years,engineering accidents caused by the deformation and failure of cutting slopes occur frequently,posing great threats to the safety of engineering construction and operation.Influenced by unfavorable factors such as undulating terrain and dense vegetation coverage in mountainous areas,traditional manual survey methods suffer from low efficiency,numerous blind spots,and high operational risks.Furthermore,single-point deformation monitoring methods are incapable of capturing surface-wide deformation information of slopes,which can easily lead to the omission of potential hazards.To this end,research on three-dimensional deformation monitoring and evaluation technology for slopes is conducted.[Methods]A cutting slope of a railway under construction was taken as the research object.Optical remote sensing pixel offset tracking and synthetic aperture radar interferometry(InSAR)methods were employed,and data fusion analysis was conducted to delineate the spatial extent of the slope deformation zone and reveal its three-dimensional deformation characteristics.[Results]Based on optical remote sensing pixel offset tracking technology,the two-dimensional planar deformation of the slope was obtained,with a maximum magnitude of 84.71 mm.InSAR monitoring revealed a positive correlation between vertical deformation and precipitation,which was consistent with the characteristics of expansive soil—softening upon water absorption and shrinking upon desiccation.Fusion monitoring identified a potential small-to medium-sized shallow landslide,with a volume ranging from 1.97×104 m3 to 4.54×104 m3.The maximum deformation was located approximately 35 m upstream of crack L1,with a deformation direction of 255°～270° and a magnitude of 85.59 mm.The stability coefficient of the slope under rainfall conditions was calculated to be 1.043,indicating a marginally unstable state requiring engineering treatment.[Conclusion]The research findings can provide a reference for the monitoring of similar engineering slopes.