Study on Stress Propagation and Attenuation Law of Tunnel Cutting Holes Under Blasting Action
In order to make clear the stress propagation and attenuation law of tunnel face under the action of cutting hole blasting,blasting tests were applied to analyze the horizontal,vertical and oblique vibration velocity.At the same time,ANSYS/LS-DYNA was used to simulate the internal stress propagation characteristics of the surrounding rock of the tunnel in the same section.The results show that the vibration velocity of the measurement point at the edge of the tunnel face is greater than that of the measurement point near the explosion source.The vibration velocity from the measurement point of the minimum explosion source is greater than the vibration velocity of the measure-ment point at the middle position;The vibration velocities of the vault and spandrel of the tunnel face are larger,and the upper measurement point is greater than the lower ones;The tunnel face stress is mainly concentrated in the horizontal and vertical directions,the oblique one is smaller.The stress change times in horizontal and vertical di-rections are mainly concentrated in 0～5 ms.The horizontal stress propagation range is wider;The stress of the measurement point below the blast hole of the tunnel face is greater than that above the same explosion source.The relevant conclusions can provide reference for the dynamic response analysis of similar tunnels.
tunnel facecutting holesblastingstress propagationattenuation law
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