Studies on the vibration of tunnel surrounding rock induced by air overpressure

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (12) : 12-17.

CHEN Ming1,2, HE Wen-xue1,2, LU Wen-bo1,2, WANG Gao-hui1,2, GUO Tian-yang1,2, LENG Zhen-dong1,2

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Abstract

On the basis of monitoring in the blasting test of Feng-ning Pumped Storage Power Station, the air overpressure induced vibration of surrounding rock during tunnel blasting excavation is studied in theory and numerical simulation. Air overpressure generated during blasting excavation in narrow-bore tunnel is large enough to cause the vibration of surrounding rock, which was characterized by high peak particle vibration velocity (PPV), long duration and slow attenuation. The arrival time of air overpressure induced vibration is determined by the propagating velocity of air shock wave. There are two kinds of air overpressure induced vibration at a certain point, the first is the arrival of the air overpressure induced vibration acting on the surrounding rock of front tunnel, the latter is caused by the air overpressure direct acting on the measurement point. The numerical study reveals that vibration attenuates very quickly when propagating in rock, so the vibration waveform recorded in site experiment is mainly air overpressure induced vibration by directly acting on the tunnel surrounding rock.

Key words

drill and blast / tunnel / vibration velocity / air overpressure

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CHEN Ming1,2, HE Wen-xue1,2, LU Wen-bo1,2, WANG Gao-hui1,2, GUO Tian-yang1,2, LENG Zhen-dong1,2. Studies on the vibration of tunnel surrounding rock induced by air overpressure[J]. Journal of Vibration and Shock, 2017, 36(12): 12-17

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