Time-dependent dilatancy for brittle rocks
| Autor: | Kaiwen Xia, Houxu Huang, Jie Li, Mingyang Wang, Ning Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Dilatant
Materials science Time-dependent dilatancy Model parameters 02 engineering and technology Geotechnical Engineering and Engineering Geology Subcritical crack growth 020501 mining & metallurgy Physics::Geophysics Brittleness 0205 materials engineering Creep lcsh:Engineering geology. Rock mechanics. Soil mechanics. Underground construction lcsh:TA703-712 Rock deformation and failure Geotechnical engineering Triaxial compression Stress concentration Microcracking |
| Zdroj: | Journal of Rock Mechanics and Geotechnical Engineering, Vol 9, Iss 6, Pp 1054-1070 (2017) |
| ISSN: | 1674-7755 |
| Popis: | This paper presents a theoretical study on time-dependent dilatancy behaviors for brittle rocks. The theory employs a well-accepted postulation that macroscopically observed dilatancy originates from the expansion of microcracks. The mechanism and dynamic process that microcracks initiate from local stress concentration and grow due to localized tensile stress are analyzed. Then, by generalizing the results from the analysis of single cracks, a parameter and associated equations for its evolution are developed to describe the behaviors of the microcracks. In this circumstance, the relationship between microcracking and dilatancy can be established, and the theoretical equations for characterizing the process of rock dilatancy behaviors are derived. Triaxial compression and creep tests are conducted to validate the developed theory. With properly chosen model parameters, the theory yields a satisfactory accuracy in comparison with the experimental results. |
| Databáze: | OpenAIRE |
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