Simulation study on distribution of vibration intensity in near field of deep hole bench blasting

In order to explore the distribution of vibration intensity in the near field of deep hole bench blasting, based on single-hole blasting field test, this paper constructed a 5 rows and 17 columns matrix model behind the blasting area, considering the seismic frequency attenuation with the spreading distance, using the Anderson model to simulate the changes of vibration “field”of single row holes under different blasting conditions. The results show that with the increase of the number of holes, the vibration velocity contours are shifted outwards, and the contour center is approximately parallel to the hole line.In the parallel hole line direction, the increasing degree of the vibration velocity gradually decreases with the increase of the number of holes, while in the vertical hole line direction, the vibration velocity attenuates gradually faster along the spreading distance.With the increase of hole spacing, the ratio of seismic wave en-ergy flow in the hole line direction increases also, and the flow direction gradually diffuses from the approximation along a small spherical surface into a large spherical surface, as well as the vibration velocity contour is gradually rough.In the parallel hole line direction, the vibration velocity of measuring point in the center of a certain range in blasting near field decreases with the increase of hole spacing, while the vibration velocity of measuring point on both sides increases, and in the vertical hole line direction, the vibration velocity attenuates gradually faster along the spreading distance in near field, while the vibration velocity attenuates gradually slowing down in far field, eventually converging.With the increase of hole charge, the energy density in the hole line direction increases, as well as the intensity of the vibration velocity contours.In the parallel hole line direction, the increasing degree of the vibration velocity of the central measuring point is significantly greater than that on both sides in near field, while in the vertical hole line direction, the vibration velocity attenuates gradually faster along the spreading distance.