Energy Dissipation and Damage Evolution Characteristics of Shale under Triaxial Cyclic Loading and Unloading

Table 1

Test scheme.

specimen number	Confining pressure/MPa	Initial unload value/MPa	Increment/MPa	Unload endpoint/MPa
S1	5	10	10	0
S2	10	10	10	0
S3	20	10	10	0
S4	30	10	10	0