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Evaluation of underground blast-induced ground motions through nearsurface low-velocity geological layers

Journal of Rock Mechanics and Geotechnical Engineering 2023年第3期15卷 600-617页

作者： Yonggang Gou Xiuzhi Shi Zhi Yu Xiaofeng Huo Xianyang Qiu College of Civil and Transportation Engineering Hohai UniversityNanjing210098China School of Resources and Safety Engineering Central South UniversityChangsha410083China Oulu Mining School University of OuluOuluFI-90014Finland

Surface ground motion produced by underground blasts is significantly influenced by near-surface geological ***,near-surface low-propagation velocity layers were always ignored in past analyses of ground motions due to their thin *** the rising concern about surface ground motions produced by the ascendant scale and frequentness of underground excavation and mining,close attention is gradually paid to ground blast ***,systemic experiments were conducted and took seven months in an underground mine to clarify the variation of motion from underground rock to surface *** attenuation of surface ground peak particle velocities(PPVs)is compared to that in underground rock,and horizontal amplitudes are compared to vertical *** between bedrock and surface ground vibrations are analyzed to illustrate the site effect of near-surface lower-propagation velocity ***-dimensional site response analysis is employed to quantify the influence of different geological profiles on surface ground *** experimental data and site response analysis allowed the following conclusions:(1)geological site effects mainly produce decreasing dominant frequency(DF)of surface ground vibrations;(2)the site amplification effect of blast vibration needs to be characterized by peak particle displacement(PPD);(3)shear waves(S-waves)begin to dominate and surface Rayleigh waves(R-waves)develop as blast-induced ground vibrations travel upward through rock and lower-velocity layers to the *** comparison of response relative displacement to a critical value is best to assess the potential for cracking on surface structures.

关键词： Surface ground motions underground blasts Geological site condition Amplitude attenuation Site response analysis

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