Research On The Stability Of Highway Slope Based On BIM Model

BIM technology is an effective means of engineering modeling and information integration,and has been widely used in slope engineering,but due to the lack of stability analysis,there is a disconnection between protection design and simulation.Therefore,based on the dependency project,this thesis adopts literature research,theoretical analysis,software development and numerical simulation methods to study the application of BIM model in slope stability analysis and realize the integrated application of BIM model construction,mesh division and stability analysis.The main research contents and conclusions are as follows:(1)The current situation and value of BIM technology application in various stages of slope engineering are introduced and summarized;after comparing the characteristics of mainstream BIM platforms,Civil3 D software of Autodesk platform is selected as modeling and secondary development software;the stratigraphic surface is smoothed by kriging interpolation method in Civil3 D software,and virtual boreholes are constructed for stratigraphic tip extinction processing by combining with geological data The 3D geological model is constructed.(2)Secondary development of Civil3 D software based on.NET platform to obtain the dynamic link library of mesh division(Mesh Civil3 D.dll),which can directly transform the geological model into Flac3 D numerical model;by comparing the numerical model calculation results of Mesh Civil3 D.dll and multi-software collaboration,the calculation results of the two models are obtained under different slope morphology and soil parameters.By comparing the calculation results of the numerical models transformed by Mesh Civil3 D.dll and multi-software collaboration,it is concluded that the relative error values of the two models are within 2.50% under different slope morphology and soil parameters,and the development function is applicable in engineering.(3)Based on the stability analysis of the excavation process of the slope by Flac3 D strength reduction method,the grid size of the BIM geological model of the relying project is determined to be 1.5m;comparing the two criteria of calculation nonconvergence and sudden change of displacement at the characteristic point,the relative error values under the natural unsupported,rainfall unsupported and rainfall supported conditions are 1.161%,4.082% and 3.279% respectively,Under the condition of unsupported by rainfall,the safety coefficient of slope is 1.02,which is lower than the requirement of specification,and the sliding surface runs from the foot of slope to the foot of slope,which is in unstable condition.(4)Through orthogonal test design,the influence of anchor length,angle of incidence and slope vertical spacing on slope stability is studied,and the sensitivity ranking of slope stability factors are: anchor length,angle of incidence and slope vertical spacing,and the anchor reinforcement scheme is given in conjunction with the project;the study on the effect of anchor reinforcement shows that: the maximum displacement of slope surface after anchor reinforcement is reduced from 68.20 cm to 3.47 cm,and the safety factor under rainfall conditions The safety coefficient before and after the slope reinforcement is 1.02 and 1.26 respectively,with an improvement of 23.53%,and the safety coefficient after the support meets the specification requirements.