隧洞全断面开挖中不同爆破孔作用边界及其诱发振动特性的比较分析

doi:10.13722/j.cnki.jrme.2021.1078

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Abstract Figuring out the vibration characteristics induced by different kinds of boreholes in tunnel drilling and blasting and the inherent differences is an important issue. Taking the full-faced tunnel blasting excavation as an example，the blasting boundaries of different kinds of boreholes were analyzed in terms of the inner and outer acting effects in rock blasting. Based on the onsite single-hole and production blasting experiments，the peak particle velocity(PPV) and the dominant frequency(DF) induced by three kinds of typical boreholes，including cutting borehole，breaking borehole and smooth borehole，were compared and analyzed. Moreover，the differences of the inner and outer boundary conditions of different boreholes and their dynamic responses were further investigated by the numerical simulation. Finally，the inherent causes of the differences of vibration characteristics induced by different kinds of boreholes were outlined and discussed from the view of blasting energy distribution and plastic zone development. The results indicate that，for the cutting boreholes which are always detonated under single free-surface condition，the blasting clamping force is much stronger and the outer blasting effect is relative weaker，resulting that more explosion energy is converted into blast vibration and the PPV is relative larger. Compared with the breaking boreholes and the smoothing boreholes，the row spacing and the decouple-charging coefficient of the cutting boreholes are much smaller，and hence，the inner blasting effect as well as the area of the blast-induced plastic zone is increased while the DF is relative lower. Due to that both the breaking boreholes and the smooth boreholes initiate under two free surfaces including one natural surface and one blasting created surface，their outer and inner blasting effects as well as the PPV and DF distributions are similar although the later have a larger decouple-charging coefficient and a smaller spacing. In practice，the safety control of blast vibration could be realized in a way of adjusting the inner and outer blasting effects by changing the inner and outer boundary conditions.

Key words： tunneling engineering full-face tunnel blasting excavation different kinds of boreholes blasting boundaries vibration characteristics explosion energy distribution plastic zone development

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1078 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I4/785

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