Abstract
In this study, a reference function was derived for the relationship between scaled distance and typical blast wave parameters, including time of arrival (t A ), peak overpressure (p +), positive duration (t +), and positive impulse (i +). A blast wave was generated using a right cylindrical cast TNT charge of weight 10.1-160 kg and a scaled height of burst of approximately 0.18 m･kg －1/3 in field experiments. Each pressure profile was measured using piezoelectric pressure sensors installed at a height of 1 m over a mass-scaled distance (Z) of 1.88 to 148.9 m･kg －1/3. The relationship between Z and each mass scaled blast parameters (T A, P +, T +, I +) was approximated using cubic natural spline functions. Compared to the surface explosion of hemispherical TNT, the shape of the explosive had a significant effect below 4 m･kg －1/3, resulting in larger P + and smaller T +.
