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Particle Vibration Velocity in the Surrounding Rock of Arched Tunnels with Straight Walls during Blasting
(1 Faculty of Engineering, China University of Geosciences, Wuhan 430074; 2 Beijing Urban Construction Exploration & Surveying Design Research Institute Co. Ltd., Beijing100101; 3 Chongqing Survey, Design and Research Institute Co. Ltd. of China Railway Eryuan Engineering Group Co. Ltd., Chongqing 400023)
Abstract For two parallel arched tunnels with straight walls, the distribution law of the particle vibration velocity of the tunnel′s surrounding rock mass, which is induced by the blasting excavation of an adjacent tunnel, is analyzed based on in-situ monitoring data. The scaling effect of the particle vibration velocity of the adjacent tunnel′s surrounding rock under the function of a P wave and its influence factors are studied using numerical simulation,and the differences between the scaling effect of the vibration velocity and the concentration effect of dynamic stress are compared and analyzed. The calculation results show that when the P wave passes through an arched tunnel with a straight wall, the particle vibration velocity of the rock mass at one side of the tunnel wall near the vibration source is faster than that at the vibration source, while it is slower at the other side of the tunnel wall. In the zones of the surrounding rock mass where the dynamic stress concentration factor is higher, the rock mass particle vibration velocity is lower, and the rock mass particle vibration velocity is higher in the zones where the dynamic stress concentration factor is lower.
Abstract：
For two parallel arched tunnels with straight walls, the distribution law of the particle vibration velocity of the tunnel′s surrounding rock mass, which is induced by the blasting excavation of an adjacent tunnel, is analyzed based on in-situ monitoring data. The scaling effect of the particle vibration velocity of the adjacent tunnel′s surrounding rock under the function of a P wave and its influence factors are studied using numerical simulation,and the differences between the scaling effect of the vibration velocity and the concentration effect of dynamic stress are compared and analyzed. The calculation results show that when the P wave passes through an arched tunnel with a straight wall, the particle vibration velocity of the rock mass at one side of the tunnel wall near the vibration source is faster than that at the vibration source, while it is slower at the other side of the tunnel wall. In the zones of the surrounding rock mass where the dynamic stress concentration factor is higher, the rock mass particle vibration velocity is lower, and the rock mass particle vibration velocity is higher in the zones where the dynamic stress concentration factor is lower.
.Particle Vibration Velocity in the Surrounding Rock of Arched Tunnels with Straight Walls during Blasting[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(5): 164-154
2017, Vol. 54 