关键词: 爆堆形态, 评价指标, 无人机航测, 三维可视化模型, 精度要求

Abstract: Muckpile shape of open-pit mine is an important part of blasting effect evaluation. In order to accurately and efficiently evaluate,the corresponding evaluation index is defined,and the low altitude multi rotor small UAV aerial survey technology with good flexibility is adopted. Taking the blasting area of Tiemen 661 m platform in Dabaoshan Open-pit Polymetallic Mine as an example,according to the spatial layout and accuracy requirements of the stope,the relative heading height is set as 100 m,the side and heading overlap rate is 80% under the five direction aerial photography mode,and four image control points are set around,generate the three-dimensional visual real scene model of two stages before and after the bench blasting by Smart3D software. The error of 3D model and image control point elevation is small and 2. 79 cm respectively,which meets the requirements of aerial survey accuracy. Through the extraction of point cloud and elevation information by IData software,the spacial distribution shape and size parameters of muckpile are obtained. The cracking range of blasting area is large and the partition phenomenon of surface fragmentation is obvious. It is considered that the phenomenon is related to the design of hole network parameters and geological conditions. The engineering practice shows that the UAV aerial survey has certain feasibility in the analysis of muckpile shape,which provides a new idea for the analysis of bench blasting effect.