期刊
ROCK MECHANICS AND ROCK ENGINEERING
卷 51, 期 6, 页码 1729-1737出版社
SPRINGER WIEN
DOI: 10.1007/s00603-018-1427-z
关键词
Brittle-ductile transition; Effect of confining pressure; Critical damage; Micromechanical model; Quasi-brittle rocks
资金
- National Key Research and Development Program of China [2017YFC1501102]
- National Natural Science Foundation of China [51679068]
- 111 Project [B13024]
As confining pressure increases, crystalline rocks of moderate porosity usually undergo a transition in failure mode from localized brittle fracture to diffused damage and ductile failure. This transition has been widely reported experimentally for several decades; however, satisfactory modeling is still lacking. The present paper aims at modeling the brittle-ductile transition process of rocks under conventional triaxial compression. Based on quantitative analyses of experimental results, it is found that there is a quite satisfactory linearity between the axial inelastic strain at failure and the confining pressure prescribed. A micromechanics-based frictional damage model is then formulated using an associated plastic flow rule and a strain energy release rate-based damage criterion. The analytical solution to the strong plasticity-damage coupling problem is provided and applied to simulate the nonlinear mechanical behaviors of Tennessee marble, Indiana limestone and Jinping marble, each presenting a brittle-ductile transition in stress-strain curves.
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