Study of rock blasting-induced damage zone and its evaluation under excavation of large-scale underground powerhouse

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (23) : 54-61.

CHEN Jun-hua1，ZHANG jia-sheng1，LI Xin-ping2,

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Abstract

Against the background of short-hole bench blasting excavation of the main powerhouse in Xi Loudu hydroelectric power plant, the curve of load on blasthole and the constitutive relation model of rock dynamic damage on account of both compression fracture and tensile damage were suggested according to C-J donation mechanism and the statistical theory of strength. The curve of load and the constitutive relation were applied to software FLAC3D for the establishment of three-dimensional finite difference numerical simulation of single-hole blasting. The characteristics of rock blasting-induced damage zone were obtained through analysis of dynamic responses. Meanwhile, blasting test, test of acoustic wave velocity in borehole and blasting vibration test were carried out on site. The comparison of results obtained from field test, the numerical simulation based on TCK constitutive relation model and the numerical simulation on account of both compression fracture and tensile damage were also made in order to verify the rationality of the one suggested by authors. The results show that, the rock blasting-induce zone expands with the excavation depth decrease because of free surface of ground of excavtion layer. The horizontal radius of blasting-induced zone reaches its maximu on the surface of excavtion layer, at the top of blasthole, and that value increases significantly with the increment of single-hole charge amount. The peak value of horizontal-radicl vibration velocity occuring at the damage margin, on the surface of excavtion layer, can be used as the criterion of blasting-induced damage. The main blasting-induced damage extension is along horizontal-radial direction instead of vertical depth. The numerical results are reasonable and achievement can provide references to the similar blasting excavation projects.

Key words

large-scale underground powerhouse / rock blasting-induced damage zone / damage evaluation / peak vibration velocity of blasting / testing of single-hole acoustic wave velocity

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CHEN Jun-hua1，ZHANG jia-sheng1，LI Xin-ping2,. Study of rock blasting-induced damage zone and its evaluation under excavation of large-scale underground powerhouse[J]. Journal of Vibration and Shock, 2015, 34(23): 54-61

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