In open-pit mine blasting,blasting delay time has an important influence on the shape of the blasting pile.The study on the variation law of blasting pile shape characteristics with changing delay time can optimize the blasting design scheme,facilitate the subsequent procedures such as shovel loading,transportation and crushing,and improve the mine production efficiency.The shape of the blasting pile in mine production is mainly evaluated by the height and shape characteristics of the blasting pile.The ideality of the blasting effect can be evaluated by analyzing whether the shape of the blasting pile meets the production requirements of shovel loading equipment.Taking a bench blasting project of an open-pit mine,the UAV tilt photogrammetry technology was used to obtain mine blasting pile tilt image data,and built a blasting pile model with smart 3D.The contour curve of blasting pile model was extracted,and the shape characteristics of blasting pile under different delay time were studied.The evaluation index of blasting pile under the delay time with 23 ms between holes and 50 ms delay between rows was better than those of other groups,which was more suitable for blasting production in the mine.Through MATLAB software,the Weibull function was selected to fit the shape of the explosive heap,and the value range of parameter α of Weibull function was 1.0297~1.2194,and the value range of β was 1.1754~1.8040.