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Study on a concise and unified unstable creep model for rocks

Cheng Yang, Zhang Liangliang

Journal of Theoretical and Applied Mechanics

2024

Vol. 62 nr 3

477--490

The unsteady creep curve of rocks is antisymmetric to the dynamic surface subsidence curve of coal mining. Accordingly, a four-parameter unsteady creep model of rock was established using an analogous reasoning method from the perspective of phenomenology, and a simple method for determining the model parameters was proposed. The test curves of four different types of rocks were in good agreement with the theoretical curves of the model. In particular, the accelerated creep test curves with nonlinear characteristics were consistent with the theoretical curves of the model, verifying the rationality and accuracy of the model.