the analysis of the interaction of longitudinal wave and crack
and the dynamic fracture toughness of concrete
the deep or the perfoliate crack propagation of mass concrete under blasting longitudinal wave was studied; the safe peak particle velocity (PPV) for concrete with crack was obtained; and the effect of the frequency and the incidence angle of longitude wave was studied. The result indicated that the lower frequency and the higher incidence angle of longitudinal wave will easily lead to the crack propagation. On condition of frequency at 10 Hz and incidence angle at 90 degree
the safe PPV of concrete with crack is 0.95 cm/s; it is lower than the value on the handbook of construction planning of hydraulic and hydroelectric projects
which is 5 cm/s for concrete gravity dam and concrete sluice board