Study on Blasting Effect of Jointed Rock Mass Tunnels Under Different Slotted Hole Angles
In order to explore the influence of the angle of the slotted hole on the slotting blasting effect in the jointed rock mass tunnel,the influence of the slotting hole angle on the slotting blasting effect was theoretically analyzed based on the Xialiao Tunnel with serious joint fracture development,and two common methods were listed,and finally the two tunnel models with slotted hole angles of 60° and 70° were numerically simulated and calculated by combining numerical simulation software,and the damage area and peak effective stress of the two models were quantitatively analyzed.And the appropriate slotting hole angle is selected based on the results.The results show that the existence of joint fractures will change the propagation direction and energy distribution of stress waves,and affect the blasting effect.In the grade V surrounding rock,the average peak effective stress of the70° slotting hole is1.36 times that of 60°,and the blasting damage range is larger than that of 60° and the distribution is continuous,so the selection of 70° slotting hole is conducive to improving the tunneling efficiency.
jointed rock masstunnelslotted holeangleblasting effect
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