Blasting Construction Influence of Large-section Ventilation Inclined Shaft on the Vibration Characteristics of Adjacent Tunnels
Taking the blasting construction of the large-section ventilation inclined shaft of the Dabashan Tunnel as an example,the vibration velocity caused by the blasting was monitored on site,the wavelet decomposition and HHT transform were used to denoise the blasting vibration signal,and the dynamic response,blasting vibration wave propagation law,blasting vibration energy and main frequency of the adjacent tunnels under the action of blasting load were analyzed.The blasting scheme was optimized to ensure the tunnel safety.The research results show that the attenuation rate of the peak vibration velocity of the adjacent tunnel is greater than that of the ventilation inclined shaft,and the peak vibration velocity of the particle exceeds the control critical value,so the blasting scheme needs to be optimized.The vertical vibration response of the ventilation inclined shaft and the adjacent tunnel is the most significant.With the increase of the distance between the ventilation inclined shaft and the adjacent tunnel,the main frequency of blasting vibration gradually decreases,and the blasting vibration will not cause structural resonance.Wavelet decomposition and HHT transform can be used to denoise the blasting vibration signal to effectively reflect the blasting vibration characteristics of the tunnel.
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