爆発衝撃波の速度減衰に関する実験

抄録

Shock waves generated by the explosion of gases or explosives contain a great deal of energy. It will decrease inits quantity as traveling further from the explosion sourse. In the present investigation studies have been carried out on the phenomena of the decreasing process of shock wave as its object. Experiments were done in a small test gallery, whose diameter, length and wall thickness are 450mm, 10m and 6mm, respectively. Setting No.3 Kiri-dynamite on the corner cutting mortor, test blastings were practised several times. The shape of angled mortor is 120mm in diameter and 1m in length having 5×5cm right angle notch in its direction of axis. Blastings were always executed towards the exit of gallery. The velocity of shock wave is obtained by measuring the arrival time of shock wave to each measuring point. The pressure of shock wave was calculated from the velocity. As a result of the present study, it is concluded that pressure (P), velocity of shock wave (V) and its traveling time (t) are the functions of distance (R). Namely, the incident pressure P (atm) has a relation of
P=k₁/R^2/3,
the velocity V (m/msec)
V=k₂/R^1/3
and traveling time t (msec)
t=k₃·R^4/3,
where coefficient k₁, k₂ and k₃ are bound as k₁ ∝k²-₂∝k²-₃ R is the distance between measuring & blasting point.