In Situ Stress Effects on Smooth Blasting: Model Test and Analysis

Table 4

P-wave velocity and damage value of each specimen.

Type of specimen	Monitoring point	Average P-wave velocity before explosion V0 (m/s)	P-wave velocity after explosion V (m/s)	Damage D (%)
G1	1	1430	1391	5.2
	2		1411	2.6
	3		1421	1.2
G2	1	1471	1442	3.9
	2		1452	2.5
	3		1463	1.1
G3	1	1681	1657	2.9
	2		1666	1.7
	3		1670	1.2