A new method to evaluate the brittleness for brittle rock using crack initiation stress level from uniaxial stress-strain curves
文献类型：期刊论文
| 作者 | Wang, Y.1; Li, C. H.1; Hu, Y. Z.2; Zhou, X. L.1 |
| 刊名 | ENVIRONMENTAL EARTH SCIENCES
 |
| 出版日期 | 2017-12-01 |
| 卷号 | 76期号:23 |
| ISSN号 | 1866-6280 |
| 关键词 | Brittleness Index Crack Initiation Stress Uniaxial Compressive Test Hydraulic Fracturing |
| DOI | 10.1007/s12665-017-7117-4 |
| 文献子类 | Article |
| 英文摘要 | Brittleness has been a prevalent descriptor in rock mass engineering and formation fracturing stimulation. Here a new definition of mechanical brittleness index as crack initiation stress level (sigma(ci)/sigma(c)) is proposed and verified with diorite, granite, marble, sandstone, and shale samples using uniaxial compressive strength (UCS) test. Regression analysis reveals obvious correlation between sci/sc and four brittleness definitions based on UCS and Brazilian tensile strength (BTS) (B19 = sigma(c)/sigma(t), B20 = (sigma(c) - sigma(t))/(sigma(c) + sigma(t)), B21 = (sigma(c) x sigma(t))/2, B22 = (B21)(1/2)). For diorite, granite, marble, and sandstone, significant relationships exist between B19, B20, and B23; however, for anisotropic shale, obvious relationships were found between B21, B22, and B23. It is suggested that sigma(ci)/sigma(c) can well reflect the heterogeneity and anisotropy of rock and the correlation between B19, B20, B21, B22, and sigma(ci)/sigma(c) depends on the rock structural fabric. In addition, rock with high brittleness generally has a lower sci/sc value and fracture easily occurs during sample deformation. It is not the case that formation with higher brittleness is considered as good fracturing candidates. Fracture pattern was obtained for shale samples from X-ray CT scanning, and the results reveal that fracture density is the maximum for sample with the lowest sigma(ci)/sigma(c) value. The most striking finding is that there exists a good correlation between the stimulated fracture density and sigma(ci)/sigma(c), and it implies that a good formation for hydraulic fracturing is not of high brittleness. The proposed brittleness index would be helpful to evaluate the formation fracability and screen hydraulic fracturing candidates. |
| WOS关键词 | FRACTURE ENERGY ; INDENTATION ; SHALE ; COMPRESSION ; STRENGTH ; HARDNESS |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Water Resources |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:000418850500005 |
| 资助机构 | Beijing National Science Foundation of China(8164070) ; Beijing National Science Foundation of China(8164070) ; National Natural Science Foundation of China(41502294) ; National Natural Science Foundation of China(41502294) ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Beijing National Science Foundation of China(8164070) ; Beijing National Science Foundation of China(8164070) ; National Natural Science Foundation of China(41502294) ; National Natural Science Foundation of China(41502294) ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Beijing National Science Foundation of China(8164070) ; Beijing National Science Foundation of China(8164070) ; National Natural Science Foundation of China(41502294) ; National Natural Science Foundation of China(41502294) ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Beijing National Science Foundation of China(8164070) ; Beijing National Science Foundation of China(8164070) ; National Natural Science Foundation of China(41502294) ; National Natural Science Foundation of China(41502294) ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/82408]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Wang, Y. |
| 作者单位 | 1.Univ Sci & Technol Beijing, Beijing Key Lab Urban Underground Space Engn, Dept Civil Engn, Sch Civil & Resource Engn, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Key Lab Shale Gas & Geoengn, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Y.,Li, C. H.,Hu, Y. Z.,et al. A new method to evaluate the brittleness for brittle rock using crack initiation stress level from uniaxial stress-strain curves[J]. ENVIRONMENTAL EARTH SCIENCES,2017,76(23). |
| APA | Wang, Y.,Li, C. H.,Hu, Y. Z.,&Zhou, X. L..(2017).A new method to evaluate the brittleness for brittle rock using crack initiation stress level from uniaxial stress-strain curves.ENVIRONMENTAL EARTH SCIENCES,76(23). |
| MLA | Wang, Y.,et al."A new method to evaluate the brittleness for brittle rock using crack initiation stress level from uniaxial stress-strain curves".ENVIRONMENTAL EARTH SCIENCES 76.23(2017). |
入库方式： OAI收割
来源：地质与地球物理研究所
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