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(1) The experimental method of high-speed photography in large blasting area is studied, the high-speed photogrammetry scheme of high-step throwing blasting is formulated, and the methods of ground marking point arrangement and initiation time marking in field implementation are studied.

1), and study the high-speed camera experiment in large blasting area; The design of high-speed camera measurement scheme for high-altitude throwing blasting, the field implementation of ground marking point positioning and the determination method of initiation time are studied.

(2) According to the data obtained from high-speed photography experiment, the law of blasting throwing speed is analyzed, and the law of rock throwing under different bench heights is analyzed. The initial velocity of rock movement in Heidaigou open-pit mine is between19 and 27m/s, and the average velocity is between 1 1~ 17m/s, and the initial velocity and average velocity in the middle of the bench are higher than those in the upper and upper ends.

2) Based on the data collected by high-speed camera experiment, the speed mode of throwing blasting and the throwing mode of rocks with different heights are discussed. The initial velocity of rock in Heidaigou open-pit mine is 19 ~ 27m/s, with an average of1~17m/s; The initial velocity and average velocity of rocks in the middle of the platform are higher than those at the top and bottom.

(3) The influence of rock structure development on throwing law and the influence of rock breaking time on blasting effect are analyzed.

3) The influence of rock structure and development stage on throwing mode and the influence of rock crushing time on blasting effect are analyzed.