Research On The Deformation Of Ground And Buildings In Mining Area Under The Simultaneous Monitoring Based On 3D Laser Scanning

At present,the application of 3D laser scanning technology in the deformation monitoring of subsidence area is respectively to obtain the deformation value of the ground and the buildings.In the buildings deformation monitoring,a large number of ground data are not available.In the ground deformation monitoring,most of them only get the ground subsidence information,and do not extract the horizontal displacement,which leads to the waste of point cloud data.Secondly,due to the different structure of the building,when the ground displacement and deformation transfer to buildings,the response of the building is different.A large number of data of surface and buildings can be obtained under the simultaneous monitoring based on 3d laser scanning,which is helpful to study the relationship between the buildings deformation and the ground deformation.Therefore,this article makes a study on the deformation of ground and buildings in mining area under the simultaneous monitoring based on 3d laser scanning:(1)A method for obtaining the deformation and Displacement of buildings is researched.This paper presents a method of building's feature lines extraction based on 3-D terrestrial laser scanning technology.The slope of the feature line is obtained by using the method of multiple fitting and averaged.Aiming at the problem of poor precision of feature points extraction,an algorithm for buildings deformation and displacement extraction based on registration of building feature regions is researched.(2)A method for obtaining the deformation and displacement of ground is researched.In order to get the ground point,a method of elimination of vegetation is researched on the basis of uniformity of point cloud.Most of the vegetation on the ground was eliminated.With RanSAC filtering algorithm of surface fitting,eliminate residual non ground points,the surface subsidence value can be obtained.(3)A method for obtaining the subsidence value of ground is researched.Based on the analysis of the spatial distribution characteristics of ground point cloud,using the algorithm to extract the trunk,the horizontal displacement can be obtained by the registration of the homonymy trunk.Furthermore,the horizontal displacement value can be obtained.The horizontal displacement and subsidence value of barycenter can be obtained by using the registration of feature region.(4)This paper takes the school above the 6306 working face as the research object.And research on the deformation of ground and buildings in mining area under the simultaneous monitoring based on the algorithm proposed in this paper.Then analyse the error of deformation monitoring.Finally,according to the monitoring results,the relationship between ground and building deformation and displacement is analyzed.