In this study, the isostress cyclic loading method (ICLM) was proposed to study the shear stress relaxation characteristics of rock with a structural plane and the connection between the stress relaxation and long-term strength. Samples with artificial joint surfaces based on the 4th, 6th, and 10th discontinuity lines from Barton’s ten standard lines were poured using cement mortar. Shear stress relaxation tests were conducted with a biaxial rheological testing machine using the ICLM under various stress levels, where the shearing loading value was larger than the long-term strength. The law of shear stress relaxation was studied based on the test results. The interaction mechanism between stress relaxation and creep was discussed, and a stress relaxation method was proposed to determine the long-term strength that achieved the optimal results. This study could provide a reference for engineering practices and preparation for constitutive studies.
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