Dynamic Disturbing Law of a Round Tunnel Subjected to Blasting Seismic Wave

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (18) : 7-12.

SUN Jinshan, ZUO Changqun, ZHOU Chuanbo, JIANG Nan

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Abstract

The seismic waves induced by blasting will cause the dynamic response of neighboring tunnel, which is harmful to the stability of tunnel. The numerical simulation method is used to analyze the dynamic disturbing on the neighboring tunnels produced by blasting seismic waves. The numerical simulation results show that when stress wave passes through the round tunnel, the direction of principal stress and dynamic stress concentration factor distribution patterns of the surrounding rock mass are similar with the state under equivalent static loads. On the round tunnel wall, only the principal stress magnitude of rock mass disturbed by the additional dynamic stress. However, inside the round tunnel wall, both the principal stress magnitude and direction are disturbed. The vibration velocity concentration phenomenon in the tunnel will also induce by the stress wave, and rock particle vibration direction is same as the direction of wave propagation. The velocity concentration factor distribution patterns are different with the dynamic stress concentration factors, and the maximum point position difference between them is about 90 °. This phenomenon indicates that the maximum velocity concentration factor position dose not coincide with the maximum dynamic stress concentration factor position in the round tunnel. The maximum velocity concentration factor on the tunnel wall increases with regularization wave time; moreover, with regularization wave time increasing, the maximum dynamic stress concentration factor on the tunnel wall first increases and then decreases.

Key words

blasting vibration / tunnel / P wave / dynamic stress concentration / vibration velocity concentration / numerical simulation

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SUN Jinshan, ZUO Changqun, ZHOU Chuanbo, JIANG Nan. Dynamic Disturbing Law of a Round Tunnel Subjected to Blasting Seismic Wave[J]. Journal of Vibration and Shock, 2015, 34(18): 7-12

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