Extraction And Application Of Characteristic Information Of Explosion Based On 3D Laser Scanning Technology

For a long time,resources waste and environmental destruction,caused by extensive exploitation and management of mineral resources,restricts seriously the sustainable development of resources utilization and ecological environment in our country.Therefore,it is of great significance to improve resources management and utilization and obtain objective data quickly and accurately through the advanced technologies.Correspondingly,the provided technical support and decision-making basis for mining administration and production department are helpful to promote standardization,modernization and informatization of the resources management.Therefore,it is necessary to obtain the objective basic data of minerals quickly and accurately,provide technical support and decision-making basis for the mining administration and production departments,and promote the transformation of natural resource management to standardization,modernization and informationization.3D laser scan technology which can realize rapid scanning with the advantages of high precision,high efficiency and non-contact is used to obtain the real 3D coordinate of surfaces by emitting laser points to the object.The thesis combines modern surveying and mapping theory with blasting engineering.In order to explore the application of new technology in mineral resources development and utilization,this paper emphatically studied the volume calculation and feature extraction of blasting pile on the basis of 3D laser scan technology.The main research work and achievements are as follows:(1)Data acquisition and data processing flow of 3D laser scan technology are introduced in detail.According to the characteristics of explosion point cloud data,ICP algorithm that can reach centimeter order is used to accurately splice the multi station data based on the coordinate splicing of absolute position site.The point cloud data is denoised successively through the methods of reflectance threshold,SOR filtering and rotation transformation-based eye recognition.Such method can effectively remove the dust in the air and the noise points generated by large machines and people on the ground,and help obtain the clean point cloud data which provides a high-quality data support for calculation of explosion volume and feature extraction.(2)This study determines the contour boundary before and after blasting by the method of superposition analysis and curvature calculation,then makes a comparison with the main methods of volume calculation,further analyzes the advantages of 3D laser scan technologybased volume calculation,finally develops a new method of volume calculation method based on laser point cloud data.(3)Based on RISCAN Pro,the apophysis height and the distance of forward throw can be rapidly extracted after explosion.Intelligent extraction for the information of blasting pile on MATLAB platform realizes man-machine interactive and automatic extraction of the apophysis height and the distance of forward throw after explosion.Then a comparison analysis is conducted between the extracted results and actual values.The statistical analysis about the precision of extracted information shows it provides accurate data supports for the blasting effect evaluation.(4)Based on the information of blasting pile and the on-site geological information,ten indicators are chosen for the evaluation system of blasting effects.The fuzzy comprehensive evaluation method is used to evaluate the blasting effect of blasting pile,where some evaluation indexes such as loose coefficient,uplift height,explosive unit consumption and labor cost are lower than the expected values,and others such as distance of throw distance,number of holes arranged,vibration intensity and dust concentration are higher than the expected values.