Study on Cumulative Effect of Slope Deformation Under Cyclic Blasting Vibration
In order to study the cumulative dynamic load of the slope under cyclic blasting,the on-site blasting vibration monitoring was carried out on the eastern slope of the Jijiping mining site in Baima Iron Mine,and the cyclic loading simulation calculation was carried out by FLAC3D software.The results show that the vibration velocity of the slope in the horizontal radial,horizontal tangential and vertical directions increases first and then decreases,and the overall trend is downward,and the peak velocity appears in the horizontal radial direction.With the increase of blasting times,the maximum displacement in the horizontal direction of the slope increases from 7.89 mm to 8.05 mm,and the corresponding shear strain increases from 7.44 × 10-4 to 7.88 × 10-4.There is a positive correlation between the cumulative deformation of the slope and the number of blasting vibrations.The expression of the relationship between the horizontal displacement X and the blasting times n is deduced.Through the numerical simulation method,the threshold value of safe blasting times under the production blasting intensity can be calculated,so as to guide the safe production of the mine.
万方数据
维普
