AE energy evolution during CJB fracture affected by rock heterogeneity and column irregularity under lateral pressure
| Autor: | Bin Gong, Yongyi Wang, Tao Zhao, Chun’an Tang, Xiaoyu Yang, Tiantian Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Geomatics, Natural Hazards & Risk, Vol 13, Iss 1, Pp 877-907 (2022) |
| Druh dokumentu: | article |
| ISSN: | 19475705 1947-5713 1947-5705 |
| DOI: | 10.1080/19475705.2022.2047114 |
| Popis: | Considering that the mechanical mechanism and energy release law of gradual failure of columnar jointed basalt (CJB) are affected by lateral pressure, rock heterogeneity and column irregularity, etc., the numerical CJB models with various column dip angles, irregularity degrees of column and lateral pressures were established through the digital image correlation. The progressive failure process and released energy of CJBs were simulated under the loading rate of 0.05 mm/step based the continuum mechanics and statistical damage theory. The influences of rock inhomogeneity, column irregularity degree, and model boundary on the nonlinear deformation and failure of CJB were comprehensively investigated. The results demonstrate that the effect of the inhomogeneity index depends on column dip angle, and the equivalent deformation modulus of CJBs is more sensitive to the inhomogeneity index than the lateral pressure. Moreover, the compressive strength along the direction perpendicular to the column axis basically decreases with column irregularity degree increasing when the meso strength of rock is 120 MPa. Besides, the mechanical properties and elastic energy of irregular CJBs are greatly affected by the model boundaries. These achievements will contribute to understanding the inner failure mechanism and energy evolution of CJBs. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|