Numerical simulation of one-time blasting completion of the cutting shaft by stage blasting in medium deep holes
To analyze the effect of stage blasting in a medium deep hole,ANSYS/LS-DYNA finite element numerical simulation software was used to simulate and calculate the stress changes and damage areas at the cutting shafts of medium deep hole blasting under two different charging structures:stage charging and non-stage charging.The results show that after the stage blasting in the hole,the stress on both sides of the middle of the cutting shaft is more concentrated,and the stress wave generated by the explosive explosion acts more on the rock at the top of the hole.After stage blasting,the lower part of the blast hole detonates first,creating a good free surface for the upper part of the explosion.The energy generated by the explosion acts more on both sides and top of the rock,resulting in a higher damage height in the damage area.Cracks were more densely at the bottom of the model,and the number of cracks increased significantly at the outer boundaries of the model,as well as the width and length of the crack.This proves that stage blasting in the hole has a better effect on the one-time blasting completion of the cutting shaft.Finally,this scheme was successfully applied to construct a cutting shaft with a height of 13.2m and a cross-section of 2.1 m X 2.2 m at the mining site,this indicates that the scheme has good engineering significance and promotional value.
cutting shaftmedium deep hole blastingstage blasting in the holenumerical simulationrock damage
万方数据
维普
