Slope Stability Analysis and Deformation Prediction of Dump Site by Combining SBAS-InSAR and Numerical Simulation
To explore the slope deformation law of the dump site that landslide risk still exists after the treatment of open-pit mine dumps,the dump site in Dagushan open-pit mine was taken as an example.Firstly,the surface settlement time series monitoring was carried out by using the Short Baseline Subset and Interferometric Synthetic Aperture Radar(SBAS-InSAR)technique.The main settlement areas and stability influencing factors of the slope of the dump site were analyzed.Then,COMSOL software was used to establish the response relationship between internal displacement and safety factor of typical settlement areas and rainfall,and to conduct collaborative analysis on the spatiotemporal deformation characteristics of the study area.Finally,by constructing a Particle Swarm Optimization(PSO)with integrated multi class loss functions to optimize the Long Short Term Memory Network(LSTM)prediction model,regional settlement time series prediction was carried out.The results show that there are three typical settlement areas in the central and northern regions,with a maximum cumulative settlement of 295.8 mm and a maximum annual average settlement rate of about 134.2 mm/a.Effective rainfall is the main influencing factor of slope deformation,and as the early rainfall process continues,the maximum decrease rate of slop stability coefficient is about 0.025％.The PSO-LSTM model integrated with multi class loss functions can reflect the fluctuation trend of settlement in the dump site,and its prediction accuracy comprehensive evaluation index(Ltotai)is 2.48 mm.The research results can provide a theoretical basis for the subsequent prevention and control of landslide disasters in dump sites.
Landslide of dump siteSBAS-InSARSlope stabilityDeformation predictionPSO-LSTM
万方数据
维普
