Application Of 3D Laser Scanning In Deformation Detection Of Qinghai-Tibet Highway Subgrade

With the development of measurement methods,three-dimensional laser scanning as a new and revolutionary means of measurement came into being,its new measurement methods,high automation,non-contact,rapid,high data acquisition density,high precision data series advantages,making the three-dimensional laser scanning technology in more and more industries have been applied.As a network connecting the national economy,the road carries the burden of nationa l economic development.The Qinghai Tibet highway and Tibet as a "lifeline",because of its high altitude in high cold area,climatic conditions and geological conditions are more extreme,more representative,so as the study object of many scholars at home and abroad.This paper takes the Qinghai-Tibet Highway as an example to study the technical problems and schemes of the three-dimensional laser scanning technology in the road detection,and explores the classification method of the roadbed deformation.Based on the 3D laser scanning point cloud data,the deformation law and disaster characteristics of the roadbed are obtained.The main research contents are as follows:1?Study the causes of the deformation of Qinghai-Tibet Highway subgrade,and summarize the factors of uneven settlement of Qinghai-Tibet Highway.2?Aiming at the characteristics of road engineering,the scheme of 3D laser scanning laser cloud data acquisition of Qinghai-Tibet Highway is designed and implemented.The coordinate system of deformation analysis based on mileage and cross section is defined.3?Aiming at the characteristics of road strip,this paper proposes a method of solving the road deformation of striped grid data,discusses the method of discrete data grid and the method of grid data filtering based on the actual data collected by roadbed.4?Based on the analysis of the deformation law of permafrost subgrade,the evaluation system and control standard of the surface deformation of permafrost roadbed are presented by analyzing the existing industry standards and the previous research results.