Experimental Study on Dynamic Response and Damage Evolution of Coal under Shocks by Multiple High-Pressure Air Blasting

Table 4

The damage results of different points of the specimen under multiple HPAB.

Times	Distance of measuring point/mm
	0	50	100	150	200	250	300
1	0.108	0.056	0.037	0.018	0.011	0.008	0
2	0.161	0.092·	0.074	0.033	0.012	0.008	0.006
3	0.193	0.156	0.086	0.041	0.020	0.011	0.006
4	0.282	0.213	0.147	0.096	0.051	0.017	0.012
5	0.351	0.275	0.208	0.153	0.136	0.074	0.023