Research On The Application Of Three-dimensional Laser Scanning Technology In Slope Deformation Monitoring Of Goafs In Mines

Nowadays,our country is in the stage of rapid development of economic construction.In engineering construction,such as high-speed railway,high-speed,water conservancy facilities,mining and so on,there are many natural slopes or engineering slopes.Once these slopes have landslides,they not only pose a great threat to the safety of people's lives and property,but also to the country.Home brings huge economic losses.Because of its non-contact measurement,high spatial resolution and fast scanning speed,three-dimensional laser scanning technology has many advantages over traditional monitoring methods in slope deformation monitoring.Therefore,this paper mainly focuses on the application of three-dimensional laser scanning technology in mine slope deformation monitoring.In this paper,the acquisition and data processing of point cloud data in slope monitoring are discussed in detail,including point cloud data acquisition method,splicing principle and method,point cloud filtering principle and method,point cloud simplification principle and method,surface reconstruction principle and method,summarize the advantages and disadvantages of various methods for the follow-up.Theoretical support is provided for data acquisition and processing.The slope of a goaf in an open pit mine of Xinli Titanium Company in Wuding County,Chuxiong City,Yunnan Province was selected as the research object,the whole process of the slope from data acquisition to data processing to final model reconstruction is implemented one by one with experimental data.Starting from the error sources of 3D laser scanning system in slope deformation monitoring,the point error model of MapTek I-Site 8200 SR ground 3D laser scanning system is established,and the theoretical point error of point cloud data obtained at different scanning distances is deduced.Experimental results show that the median error of the actual position is greater than the theoretical point error.Based on the experimental data of the study area,the deformation of the whole slope is analyzed by comparing the projected area and volume,slope gradient and direction,contour coincidence,topographic profile and absolute distance of the model between the sediment and erosion area,through MapTek I-Site Studio,Arcgis,Geomagic Control and other software.The overall deformation analysis and evaluation of the slope are obtained.In this paper,a method based on irregular feature extraction is applied to calculate the horizontal and vertical displacements of slopes.By constructing a polygon block on the point cloud data and taking the coordinates of the center of gravity of the polygon as the three-dimensional coordinates of the virtual monitoring points,the three-dimensional coordinates of two phases of 31 virtual monitoring points are obtained.It is proved that this method is feasible for analyzing slope deformation.