Blasting Seismic Waves Propagation And Dynamic Response Of Rock Slope

The most of the metal and non-metallic mines are open-pit mines in China.Slope landslide is the most common engineering geological disaster in open-pit mine.The formation of open landslide is not only related to engineering and hydrological factors of slope rock mass itself,but also the long-term repeated production blasting of open-pit mine is a factor which can not be neglected.In this paper,by blasting vibration data of multi-step terrain,the propagation law,frequency variation law and energy distribution law of blasting seismic wave are studied.The propagation law of blasting seismic waves with multiple steps and the propagation law of blasting seismic wave in the change of height and the blasting seismic wave propagation in the change of slope angle are studied by numerical simulation.The experimental results show that the energy of blasting seismic wave shifts from the two frequency bands to the low-frequency bands gradually with the increase of the height and the distance from the center of the explosion.The frequency of the slope top and the slope foot are decreasing with the increase of elevation.With the increase of the height and the distance from the center of the explosion,the vibration velocity first decreases sharply,and then the decay rate decreases due to the amplification.Along the step slope,the velocity of blasting vibration firstly increases and then decreases.In the same step plane,there is an amplification effect in the case of extending from the direction of the measured point to the two sides of the direction of the explosion.The blasting vibration velocity decreases gradually with the increase of elevation,but does not show obvious elevation magnification.At different slope angles,the vibration velocity of each measuring point on the slope decreases sharply at the initial stage,and then the velocity of the slope began to be gentle and accompanied with the enlargement.With the increasing of the angle,the peak value of the vertical vibration velocity in the slope top and the peak value of the vertical vibration velocity at the bottom of the measuring point are decreasing.The slope safety velocities were calculated.