Dynamic response of surrounding rock of large underground caverns under blast vibration and reasonable spacing between adjacent caverns

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (1) : 277-285.

CHEN Xiang1, LIU Mingxue2, QI Xiaobo2

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Abstract

Large-scale underground water-sealed oil tank consists of several underground caverns usually without lining structure. When it is designed, the spacing between caverns is a key factor to be considered. Here, dynamic response and vibration attenuation law of surrounding rock of underground caverns under blast vibration were analyzed using site monitoring combined with numerical simulation. Results showed that vibration velocity of surrounding rock decreases exponentially with the distance away from the blast center in cross-section direction; when there is an excavated cavity near the blast cavern, vibration of mass point at the side wall facing blast of the excavated cavity has amplification effect, and the peak vibration velocity is amplified by 2.2-2.5 times, while the peak vibration velocity at the side back to face blast of surrounding rock decreases obviously with the reducing range of 25%-50%; when considering the safe spacing between adjacent caverns, the peak vibration velocity at the side wall facing blast of the adjacent excavated cavern is taken as the judgment index, so incavern blast construction, the peak vibration velocity at the side wall facing blast of the adjacent excavated cavern decreases exponentially with increase in the net spacing of caverns; according to the relevant regulations, the net spacing between adjacent caverns should not be less than 30 m.

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underground water-sealed oil tank / blast / dynamic response / vibration velocity / spacing between adjacent caverns

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CHEN Xiang1, LIU Mingxue2, QI Xiaobo2. Dynamic response of surrounding rock of large underground caverns under blast vibration and reasonable spacing between adjacent caverns[J]. Journal of Vibration and Shock, 2021, 40(1): 277-285

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