Experimental Study on the Crack Initiation and Propagation of Unequal Cracks in Rock-Like Materials

Table 5

The statistical table of the test condition B coalescence mode.

Test condition B: Lcd = 24 mm and Lbc = 18 mm
	Longer crack	Shorter crack Propagation	Initial cracking location	Coalescence mode	Ultimate strength (MPa)
Test condition 16
α = 0°; Lab = 4	No	No	The lower end of the specimen	No coalescence	58.64
Test condition 17
α = 30°; Lab = 4	Yes	No	c and d	No coalescence	52.32
Test condition 18
α = 45°; Lab = 4	Yes	No	d	No coalescence	45.46
Test condition 19
α = 60°; Lab = 4	Yes	No	c and d	No coalescence	43.24
Test condition 20
α = 90°; Lab = 4	Yes	No	c	No coalescence	42.42
Test condition 21
α = 0°; Lab = 6	Yes	No	d	No coalescence	51.52
Test condition 22
α = 30°; Lab = 6	Yes	No	d	No coalescence	38.48
Test condition 23
α = 45°; Lab = 6	Yes	Yes	d	Mixed mode	41.10
Test condition 24
α = 60°; Lab = 6	Yes	Yes	d	Shear mode	47.21
Test condition 25
α = 90°; Lab = 6	Yes	No	c	No coalescence	38.79
Test condition 26
α = 0°; Lab = 8	Yes	No	c and d	No coalescence	55.81
Test condition 27
α = 30°; Lab = 8	Yes	Yes	d	Shear mode	44.54
Test condition 28
α = 45°; Lab = 8	Yes	Yes	d	Traction mode	51.98
Test condition 29
α = 60°; Lab = 8	Yes	Yes	a	Mixed mode	37.77
Test condition 30
α = 90°; Lab = 8	Yes	No	d	No coalescence	41.18