Study on Blasting Effect of Uncoupled Parameters on Ignimbrite

To analyze the influence of decoupled parameters on the blasting effect of ignimbrite, ANSYS /LSDYNA was used to establish the fi nite element method to analyze the infl uence of decoupled medium, radial decoupled coefficient and axial decoupled coefficient on tunnel construction. It is found that the effective stress intensity and the peak pressure of the hole wall decrease gradually with the increase of the decoupling coeffi cient. The damage area fi rst increases and then decreases as the axial decoupling coeffi cient increases, and the damage area reaches the peak when the decoupling coeffi cient is 2.00. Water can accelerate the propagation speed of detonation wave, reduce the attenuation of explosion energy in the propagation process, and the energy transfer eff ect of water decoupling is better. For the ignimbrite formation, it is suggested to adopt the water decoupling method during the construction, with the radial decoupling coeffi cient kd=2.00 and the axial decoupling coeffi cient kl=2.00. According to the fi eld application, the blasting quality is good and the economic benefi t is remarkable by using the recommended structural parameters of uncoupled charge.