The Research Precision Blasting Design System Based On Unmanned Aerial Vehicle Photogrammetric Technology

As one of the most widely used and high-efficiency rock-breaking methods in the open-pit mine production process,the blasting project is constantly pursuing a more intelligent design and a higher level of construction automation.The charging structure and charge are closer to the “original ecology”.The blasting produces less harmful effects.As the inheritance and development of traditional blasting,fine blasting attempts to further finely control the release of explosive energy and the process of medium crushing and throwing,which solves a series of problems in engineering blasting.However,for the description of blasting objects,traditional professional drawings are far from meeting the requirements for blasting design intelligence and construction automation because of their inherent limitations.In order to achieve "fine blasting" in the true sense,intelligent blasting The design software must use the detailed 3D geographic information of the blasting object and the surrounding environment information as the data foundation.The UAV aerial survey and remote sensing combined with multi-view 3D reconstruction technology has opened up a new way for the acquisition of 3D geographic information in the blasting field.Combining the successful methods and experience of the aerial photogrammetry industry,this paper takes the rock steps of the open pit mine as the blasting object.Firstly,the low-altitude drone aerial survey is used to scan the blasting area,and the acquired aerial image is established through multi-view 3D reconstruction technology.The real-time 3D point cloud digital model of the explosion area is used for secondary development of the open source point cloud processing tool CloudCompare to form an open-pit mine fine blasting design system based on the 3D point cloud digital model.In the system,on the point cloud model of the area to be blasted,the real contour of the blasting area is first selected by manual interaction,including the bottom line,the slope top line and the boundary on both sides;the software provides the first blast hole and according to The blasting area contour is arranged in two ways.The number is calculated by KD-tree algorithm to find the actual elevation of the blast hole orifice,so as to calculate the actualhole depth of the blast hole.In the calculation of the charge amount of the front row of holes,the trajectory triangle algorithm is used to mesh the real slope triangles,thereby obtaining the volume of the rock mass actually occupied by the front row of the blast holes,thereby obtaining the precise charge amount of each blast hole.After the blasting design is generated,it is visually and visually displayed to the designer in three-dimensional form,and finally a fine blasting parameter table for guiding blasting construction is generated.The charge amount per hole is closer to the original ecological charge,and the control of the explosive energy is more fine.This paper also tries to develop the refined blasting design system based on low-altitude drone photogrammetry technology in the Anjiapo strip mine,and has achieved good results.