An Experimental Study on Mechanical Behavior of Parallel Joint Specimens under Compression Shear

Table 2

Failure modes for specimens with the different joint inclination and joint spacing.

Joint inclination α	Joint spacing d (mm)
	15	22	29	36
0°	Failure mode I	Failure mode I	Failure mode I	Failure mode I
30°	Failure mode II	Failure mode II	Failure mode IV	Failure mode IV
45°	Failure mode IV	Failure mode IV	Failure mode IV	Failure mode IV
60°	Failure mode II	Failure mode IV	Failure mode IV	Failure mode IV
75°	Failure mode III	Failure mode III	Failure mode IV	Failure mode IV
90°	Failure mode III	Failure mode III	Failure mode III	Failure mode IV