Study of Testing Method for Dynamic Initiation Toughness of Sandstone under Blasting Loading

Table 2

Location of strain gauge point and test value.

Specimen number	Strain gauge number		Strain time parameters (μs)					Peak strain (με)
			Start time	Peak time	End time	Loading time	Unloading time
1	Gauge 4	16	20.5	22.8	61.4	2.3	38.6	11055
	Gauge 5	32	38.6	40.3	180	1.7	139.7	4795
	Gauge 6	56	67.2	69.3	124.7	3.3	55.4	2496
	Gauge 7	32	37.4	39.1	156.1	1.7	117	5559
2	Gauge 4	16	20.7	22	41.1	1.3	19.1	11660
	Gauge 5	32	38.9	40.6	144.3	1.7	103.7	5441
	Gauge 6	56	67.5	69.3	123.8	1.8	54.5	3001
	Gauge 7	32	36	39.7	156.9	3.7	117.2	5467
3	Gauge 4	16	20.5	22.9	54.6	2.4	31.7	13590
	Gauge 5	32	38.5	40.3	123.2	1.8	82.9	4648
	Gauge 6	56	67.1	71.7	125.6	4.6	53.9	2839
	Gauge 7	32	40.4	42.1	157.4	1.7	115.3	5600
4	Gauge 4	16	20.9	22.6	43.9	1.7	21.3	14130
	Gauge 5	32	38.7	41.5	163.7	2.8	122.2	5284
	Gauge 6	56	68.5	70.7	131.4	2.2	60.7	2873
	Gauge 7	32	38.7	40.6	164	1.9	123.4	5593