Experimental Investigations on Rheological Properties of Mudstone in Kilometer-Deep Mine

Table 3

Unloading confining pressures with constant axial pressure triaxial test scheme.

Load classification	I	II	III	IV	V	VI
σ1 (MPa)	60	60	60	60	60	60
σ3 (MPa)	20	15	10	8	5	3
σ1−σ3 (MPa)	40	45	50	52	55	57