In order to determine the best chassis resistance line in the high-step blasting of the Bayan Oboxi mine, the stress equation under the stress wave is derived from the rock fracture mechanism. Combined with the Livingston line, the derived physical parameters were used to correct the resistance line formula proposed by Langerfors U to calculate the optimal chassis line. The finite element dynamic analysis software is used to simulate the effective stress value and rock fragmentation of the equidistant unit at the bottom of the slope under the optimal chassis resistance. Finally, the field industrial test was carried out in combination with the medium-difficulty area of the Bayan Obo West Mine to verify the rationality of the chassis resistance line. Field experiments show that the chassis resistance line after blasting is 11.5 m, and the broken block is even. After the electric shovel is excavated, the pile is loose and the lower step is flat without obvious root.

Pengfei Zhang, Jun Duan, Mengyao Wang and Jianxin Guo. Research and Application of Chassis Resistance Line of Rock Breaking Mechanism. Academic Journal of Engineering and Technology Science (2019) Vol. 2 Issue 3: 98-107. https://doi.org/10.25236/AJETS.020060.

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