Research On Stability Evaluation Based On GIS And Prediction Method For Slope

In view of the geological disasters caused by the instability of the slope and the serious catastrophe caused to the human beings and their living environment,it's important to analysis the slope stability and predict the deformation which based on the geological conditions and the environmental characteristics,then taking measures to reinforce the slope to achieve the purpose of disaster reduction.It achieved the zoning of the entire study area,the calculation of local slope stability and the automatic searching of dangerous slip surface based on the geological survey data,construction conditions,the theory of AHP,residual thrust calculation model and sliding face search through the use of GIS system with actual project;the improved gray model was used to predict slope deformation based on the displacement monitoring data.Finally,corresponding reinforcement measures was taken according to the stability analysis for slope with the actual engineering as research object,then the reinforcement method was optimized based on the analysis and comparison of the cost.The main research contents are as follows:(1)Established a method for calculating and analyzing slope stability based on GIS.According to the geological survey data and the collection of on-site data,10 important kinds of indexes that affect the slope stability of the mining area were selected and converted into raster layers,calculating the comprehensive influence weight of each index based on AHP,then the weighted overlay tool of ArcGIS was used to realize the division of hazardous areas.The DEM model of typical slope in dangerous area according to the result of regional division was extracted,and the Python was used to create a calculation script based on the improved remaining thrust calculation of sliding surface,then the safety factor of 2D and 3D slope was calculated.(2)Prefered two kinds of improved gray model.The models of quadratic fitting of gray parameters and a combination of fusion of liner,polynomial and exponential deformation rules were established to predict displacement of monitoring points,the prediction accuracy of the two prediction models was analyzed by residual values.(3)Optimized the design of the slope reinforcement program.According to the geological prospecting data and the design specifications of highway slopes,the evaluation result of GIS was combined to extract typical slope of dangerous sections,three reinforcement schemes that anchor reinforcement,load shedding and local load shedding were designed,then the appropriate reinforcement measure was selected by considering the comparison of comprehensive program and engineering costs.