دورية أكاديمية
Research on Chaos Characteristic of Crack Evolution in Coal-rock Fracturing
| العنوان: | Research on Chaos Characteristic of Crack Evolution in Coal-rock Fracturing |
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| المؤلفون: | wanchun zhao, dan zhao, tingting wang, dongfeng jiang |
| المصدر: | Journal of Petroleum Science and Technology, Vol 7, Iss 2, Pp 49-61 (2017) |
| بيانات النشر: | Reaserch Institute of Petroleum Industry, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | coal-rock fracturing, crack evolutionary, chaos characteristic, nonlinear dynamics, zhangchen mining area, Petroleum refining. Petroleum products, TP690-692.5 |
| الوصف: | Precisely describing the formation and evolution rules of coal-rock fracturing crack have great value on reservoir fracturing improvement and highly efficient mining of coal bed methane well. In this paper, a non-linear dynamic method is used to study crack damage evolution behavior of coal-rock fracturing. Considering distribution characteristics of natural cracks in coal-rock, and based on damage mechanics, a mathematical model on stress around the tip of coal-rock fracturing crack and crack evolution is developed. Micro-crack amounts, circumferential stress, and axial stress at the crack tip of coal-rock fracturing crack evolution process are used as characteristic indicators to describe crack evolutionary. C-C method is chosen to reconstruct the phase space of coal-rock fracturing crack evolution. Correlation dimension, Lyapunov index, and Kolmogorov entropy are introduced as chaos characteristic quantities of crack evolution system, and the process of coal-rock fracturing crack damage evolution could be calculated and described. Coal-rock mass of Zhangchen mining area in Heilongjiang, China was used as a research object, and the results show that as the radial stress increases, the Kolmogorov entropy and the degree of chaos decrease; also, as the circumferential stress increases, the Kolmogorov entropy increases, and a higher degree of chaos is obtained; increasing the number of micro-cracks evolution raises Kolmogorov entropy up to a critical value, and then the Kolmogorov entropy drops, which means the chaotic degree decreases. The results calculated show that crack formation is a damage evolution process which has chaos characteristics. Finally, we provided a new way for further research on coal-rock fracturing crack evolution regularities. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2251-659X 2645-3312 |
| Relation: | https://jpst.ripi.ir/article_748_597e80d3f93f685d671ebbb447ac08b5.pdf; https://doaj.org/toc/2251-659X; https://doaj.org/toc/2645-3312 |
| DOI: | 10.22078/jpst.2017.748 |
| URL الوصول: | https://doaj.org/article/4c3063a1e61143b696663ff2773b62e9 |
| رقم الأكسشن: | edsdoj.4c3063a1e61143b696663ff2773b62e9 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 2251659X 26453312 |
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| DOI: | 10.22078/jpst.2017.748 |