Creep Behavior of Rocks with Rough Surfaces

초록

The time-dependent deformation and long-term strength of rock mass are generally controlled by the mechanical properties of discontinuity, in particular, creep properties. By using the samples based on various JRC values, a series of shear tests and shear creep tests were carried out. The mechanical properties of discontinuity under shear stress were investigated. The creep properties under shearing condition were analyzed. Results showed that both the sliding and cutting behavior can be observed during the shear tests. The sliding effect and cutting effect can obviously change the shear strength parameters. The transient and steady creep appeared in shear creep tests, but accelerating creep was not observed. The long-term strength can be identified by using the variation of creep rate and the transition of different creep stages. The long-term strength is approximately 60-70% of the conventional shear strength.

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