Vibration prediction and safety analysis of the high-end wall of a underground powerhouse under the action of lateral blasting load

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (22) : 268-277.

FAN Yong1，2， CUI Xianze1， LENG Zhendong1， LU Wenbo2， WANG Feng1

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Abstract

During construction large-scale blasting near the hydraulic structures may cause strong vibration directly affecting the safety and stability of hydraulic structures.The vibration effects on the high-end wall of a underground powerhouse under the action of lateral blasting load was studied.Combining the Sadowski formula with a thin plate model, a prediction model for the blasting vibration peak value on the high-end wall was established which can reflect the central amplification effect.Taking the blasting excavation of a grouting and draining tunnel at Shenxigou hydropower station as an example, the spatial distribution characteristics of blasting vibration on the high-end wall caused by the blasting excavation were analyzed, and the prediction model proposed was trained and tested using the measured blasting vibration data.Based on the safety control standard of blasting vibration, the safety of high-end wall of the underground powerhouse under the action of lateral blasting load was analyzed.The results show that when the blasting stress wave transmits to the high-end wall, it will be reflected.And the superposition of the reflected and the incident stress waves will aggravate the vibration effect on the high-end wall, leading to a very obvious phenomenon of center amplification.The key to ensure the safety of the high-end wall is to control the peak value of blasting vibration at its center, especially to strictly control the blasting vibration perpendicular to the high-end wall.The vibration amplitude should not be greater than 1.2 cm/s (for C20 labeled concrete powerhouse), and the tension failure of the high-end wall can be avoided.

Key words

underground powerhouse / blasting vibration / amplification effect / prediction model / safety analysis

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FAN Yong1，2， CUI Xianze1， LENG Zhendong1， LU Wenbo2， WANG Feng1. Vibration prediction and safety analysis of the high-end wall of a underground powerhouse under the action of lateral blasting load[J]. Journal of Vibration and Shock, 2020, 39(22): 268-277

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