It is important to consider the influence of temperature when evaluating the mechanical and hydro-mechanical behaviors of rock masses, since these behaviors are changed by the chemical process at the contact points of the asperities. It is thought that the chemical process is accelerated by heat. In this research, direct shear tests using a slide-hold-slide process in a residual state have been performed under two different temperature conditions using mortar specimens with a single natural rough joint.From the test results, it has been confirmed that the shear strength increased with an increase in the shear holding time in both cases. Moreover, when the rate- and state-dependent friction law was applied to this research, the thermal influence was confirmed.

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