Abstract
Taking the Luo-Sha tunnel as the research site, we monitored the blasting vibration in a tunnel portal and performed time-frequency analysis on the monitoring data. During the time domain analysis, the maximum horizontal radial component of the blasting vibration velocity is greater than the maximum horizontal tangential component, and the maximum horizontal tangential component is greater than the maximum vertical component; this result is the opposite of the result that we obtained from the blasting vibration research on a phyllite tunnel portal. With the distance increasing, especially in the tunnel portal location, the blasting vibration velocity shows a significant increase, and the slope surface of the tunnel portal shows significant vibration amplification. In the frequency domain analysis, as the distance increased, the high frequency region in the tunnel portal was magnified, whereas the low frequency region gradually weakened. In the hard rock tunnel, the high frequency region is obviously increased, whereas the low frequency region is reduced; this behaviour was the opposite of that of a soft rock tunnel.
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Acknowledgements
This work was partially supported by the National Key R&D Program of China (Nos. 2016YFC0802203), Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering (15-KF-05), Zhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geologic Hazards (PCMGH-2017-Z-01) and the Xi’an Railway Fund (Nos. 2016GG010).
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Xu, JB., Yan, CG., Yuan, H. (2018). Blasting Vibration Study of a Deep Buried Tunnel Entrance. In: Shi, X., Liu, Z., Liu, J. (eds) Proceedings of GeoShanghai 2018 International Conference: Transportation Geotechnics and Pavement Engineering. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0011-0_30
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DOI: https://doi.org/10.1007/978-981-13-0011-0_30
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