Application Research Of BIM 3D Geological Modeling Technology In Slope Stability Analysis

With the continuous improvement of engineering requirements,slope engineering has been rapid development.Super high slope,complex slope and new retaining technology are emerging,slope engineering also has more personality and complexity,which puts forward higher requirements for the work of slope engineering in all stages.As an information technology.BIM will promote the traditional construction engineering industry towards the digitized and intelligentized development as the informatization technology,as well as make the important achievements in the initial application in the road and bridge engineering.It is certainly able to bring the enhancement of quality and efficiency by introducing BIM technology to the side-slope engineering.Firstly,this paper introduces the application of BIM technology and the research status of three-dimensional slope stability analysis at home and abroad,summarizes the concept and advantages of BIM,and analyzes the domestic BIM Technology Promotion status and problems.According to the characteristics of each BIM platform,we compares and analyzes the advantages and application fields of each platform.Combined with the characteristics of slope engineering,we studies the principal application values of BIM in slope investigation,design,and construction.Then,based on the actual slope engineering project,the Unmanned Aerial Vehicle(UAV)aerial survey technology and BIM modeling technology are combined to explore the acquisition and processing of aerial survey data,as well as the technical route of building 3D slope model by BIM 3D geological modeling technology.The results show that,based on the Civil 3D modeling software of Autodesk BIM platform,the 3D geological model of slope has a good feasibility by using the terrain surface data measured by UAV and the drilling data encrypted by the Kriging interpolation method.Furthermore,the BIM model is transformed into a numerical analysis model by combining BIM software with numerical analysis software.The stability of the slope during excavation and after anti slide pile reinforcement is analyzed by using three-dimensional finite element strength reduction method.The dynamic evaluation of slope safety status during construction is carried out,and the applicability of the numerical analysis model is verified by monitoring data.Finally,a comparative analysis of the two dimensional and three-dimensional slope stability analysis results shows that the end effect has a significant impact on the difference between the two.Through theoretical derivation and ABAQUS numerical calculation,the response of sliding surface position is studied when the cohesive force,angle of internal friction and gravity are changed.Further we explore the influence law of parameter variation on the difference between the results of 2D and 3D slope stability analysis.We can get the results from the research: when c and ? are reduced by the same reduction coefficient,it will not affect the position of the sliding surface;when the value of c increases,the sliding surface will be deeper and more gentle,the sliding volume will be smaller,and the final effect will be more obvious,also for the stability analysis results,there will be larger difference between two-dimensional and three-dimensional slope.The results will be opposite when the value of ? and ? increase.