Influences of in-situ stress on blast-induced rock fracture and seismic waves

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (13) : 64-70.

YANG Jianhua， WU Zenan， YAO Chi， JIANG Shuihua， JIANG Qinghui

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Abstract

Deep rock mass blasting excavation is due to combined effects of high in-situ stress and dynamic stress generated by explosion. Here, effects of in-situ stress field on blast-induced rock fracture and seismic wave energy outside cracked zone were investigated by using a coupled numerical simulation method called SPH-FEM. The results showed that with increase in in-situ stress level, cracked zone range narrows and crack propagation velocity drops; in a non-hydrostatic in-situ stress field, rock cracks in cracked zone mainly spread along the maximum principal stress direction, but in-situ stress almost does not affect formation of blast crushed zone; form change of blast cracked zone under in-situ stress affects energy and propagation characteristics of blast seismic waves; with increase in in-situ stress level, more explosion energy of explosives is converted into seismic wave energy, generated blast seismic waves with high frequencies decay faster with increase in distance, and blast seismic wave energy in smaller principal stress direction is larger; the study results can provide a theoretical reference for optimal design of deep rock mass blasting excavation.

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blast / in-situ stress / crack / vibration / seismic wave / SPH-FEM

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YANG Jianhua， WU Zenan， YAO Chi， JIANG Shuihua， JIANG Qinghui. Influences of in-situ stress on blast-induced rock fracture and seismic waves[J]. Journal of Vibration and Shock, 2020, 39(13): 64-70

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