| In recent years,with the development of the economy,the contradiction between human and nature has become increasingly prominent.The geological disasters have brought a lot of life and property losses frequently to the community.Therefore,it is of great significance to strengthen the study of geological disaster monitoring system and warning method.The traditional geological disaster monitoring and warning system often has the disadvantages such as poor timeliness and low visualization.With the development of information technology and automation technology,geological disaster monitoring system and theoretical methods have improved a lot.Therefore,how to use existing computer network technology and 3D modeling technology to improve the timeliness and visualization of monitoring and warning system is the direction of geological disaster monitoring and warning research.The paper takes Sichuan province strategy new industry development special fund project(SC2013510109139)and Sichuan science and technology support project(2015GZ0121)as the foundation,and aims to combine the BIM modeling technology with the traditional geological disaster monitoring methods to establish a three-dimensional visual monitoring and warning system.The author takes the landslide safety monitoring project of Honghua village tunnel entrance in Songpan County of Sichuan Province as an example.According to the engineering geology profile of the study area,the author has maked the automatic monitoring scheme based on displacement monitoring.At the same time,the BIM modeling process for landslide monitoring is proposed.Based on the abundant geological survey data,the author uses CATIA which belongs to the BIM software to integrate the spatial data information,terrain feature information and monitoring information of the research object into the geological disaster monitoring system.Combining with the research of monitoring data preprocessing technology has achieved a high degree of visualization of single landslide warning forecast.The results of this paper has achieved are as follows:(1)According to the modeling method and characteristics of BIM technology,the basic flow of BIM geological model modeling is determined.The modeling process mainly includes the application of CATIA software to establish the landslide area 3D geometric model and the application monitoring database system to realize the digitization of the irregular geological body,that is,the physical model.BIM geological modeling uses the combination of geometric model and physical model to realize not only the effect of 3D visualization monitoring in landslide area,but also it can simulate the dynamic deformation of landslide area based on the finite element analysis.(2)Based on the analysis of the monitoring data,the finite element numerical simulation method is used to evaluate the stability of the landslide area.At the same time,a simplified method of model preprocessing is proposed to introduce the three-dimensional geological model with high degree of simulation into the numerical analysis software such as ANSYS and so on.(3)Based on the actual survey results and finite element analysis and calculation,the key areas of landslide instability and monitoring are determined,and the automatic monitoring scheme based on deformation monitoring is developed.Through the analysis of the monitoring data,the rationality of CATIA 3D geological modeling and finite element analysis is verified.(4)On the basis of the existing landslide monitoring research results,the data processing flow of Songpan landslide monitoring data is worked out.Combined with the monitoring data and the finite element analysis results,the classification criteria of Songpan landslide monitoring and warning threshold are comprehensively determined.The research contents and achievements of this paper are of great significance to promote the application of BIM modeling technology in geological engineering field and the development of 3D visualization landslide monitoring system. |
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