Funding for this research was provided by:
Natural Sciences and Engineering Research Council of Canada (RGPIN-2019-05078)
Article History
Received: 10 July 2022
Accepted: 5 January 2023
First Online: 13 January 2023
Declarations
:
: The authors have no competing interests to declare that are relevant to the content of this article.
: The relative interface displacement <i>d</i>∆ is assumed to consist of elastic and plastic parts (i.e., <i>d</i>∆<sub><i>e</i></sub> and <i>d</i>∆<sub><i>p</i></sub>). Correspondingly, the incremental form of the interface stress <i>σ</i> can be expressed by the elastic part of the relative displacement <i>d</i>∆<sub><i>e</i></sub> and interface stiffness <i>K</i><sup><i>e</i></sup>:Equation removed To evaluate rock/CPB interface behavior, the contribution of interface friction and adhesion was evaluated through Drucker–Prager yield criterion in which the model parameters related to friction and adhesion govern the position of the yield surface.Equation removedwhere <i>I</i><sub>1</sub> and <i>J</i><sub>2</sub> denote the first stress invariant and second deviatoric stress invariant, the yield function parameters <i>α</i><sub>int<i>f</i></sub> and <i>C</i><sub>int<i>f</i></sub> can be defined in terms of the interface friction angle, <i>δ</i><sub>int<i>f</i></sub>, and adhesion, <i>c</i><sub>int<i>f</i></sub>.Equation removedEquation removed A detailed discussion about the determination of interface model parameters can be found in [CitationRef removed]. Moreover, the interface friction angle <i>δ</i><sub>int<i>f</i></sub> and adhesion <i>c</i><sub>int<i>f</i></sub> are commonly assumed to be related to the shear strength parameters of CPB materials in practice. To simplify the numerical analysis, the same assumption is adopted in the present study. Correspondingly, <i>δ</i><sub>int<i>f</i></sub> = 0.5<i>Φ</i> and <i>c</i><sub>int<i>f</i></sub> = 0.1c are assumed.