Factors Controlling the Difference in Brazilian and Direct Tensile Strengths of the Lac du Bonnet Granite
文献类型：期刊论文
| 作者 | Qi, Shengwen2,3,4,5; Lan, Hengxing1,5; Martin, Derek5; Huang, Xiaolin2,3,4 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2020-03-01 |
| 卷号 | 53期号:3页码:1005-1019 |
| 关键词 | Brazilian tension strength Direct tension strength Grain-based model UDEC Ratio of the shear to normal stiffness Lac du Bonnet granite |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-019-01946-x |
| 英文摘要 | Laboratory tests showed that the average direct tension strength (DTS0) of the Lac du Bonnet granite was 6.9 MPa, and significantly less than its average Brazilian tension strength (BTS0), i.e., 8.8 MPa. In this paper, a grain-based model (GBM) with a 2D universal discrete element code (UDEC) was used to explore factors that could control the difference in the direct tension strength (DTS) and Brazilian tension strength (BTS) of the Lac du Bonnet granite from the micromechanical point of view. Micro parameters of the grain contacts were investigated, i.e., the tensile strength (T), cohesion (c), friction angle (phi), and the ratio of the shear to normal stiffness (lambda). Results show that both BTS and DTS highly depended on log(lambda). With an increase in log(lambda), the BTS first increased nonlinearly and decreased instead after achieving a peak while the DTS always increased nonlinearly. The BTS was sensitive to T and c, while the DTS was mainly sensitive to T. The ratio of DTS to BTS first decreased with the increase of log(lambda) and then increased instead from a minimum. It was found that the GBM with UDEC can well reproduce the uniaxial compression, direct tension and Brazilian tests of the Lac du Bonnet granite simultaneously only on condition that lambda = 2.51. This indicated that the shear stiffness of the grain boundary in the Lac du Bonnet granite may be several times larger than its normal stiffness. This may be the main factor controlling the difference in the BTS and DTS of the Lac du Bonnet granite. |
| WOS关键词 | PARTICLE MODEL ; ROCK-MECHANICS ; FAILURE ; MICROSTRUCTURE ; COMPRESSION ; FRACTURE ; TESTS |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000522733700003 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95518]  |
| 专题 | 地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室 |
| 通讯作者 | Qi, Shengwen |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China 5.Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB, Canada |
| 推荐引用方式 GB/T 7714 | Qi, Shengwen,Lan, Hengxing,Martin, Derek,et al. Factors Controlling the Difference in Brazilian and Direct Tensile Strengths of the Lac du Bonnet Granite[J]. ROCK MECHANICS AND ROCK ENGINEERING,2020,53(3):1005-1019. |
| APA | Qi, Shengwen,Lan, Hengxing,Martin, Derek,&Huang, Xiaolin.(2020).Factors Controlling the Difference in Brazilian and Direct Tensile Strengths of the Lac du Bonnet Granite.ROCK MECHANICS AND ROCK ENGINEERING,53(3),1005-1019. |
| MLA | Qi, Shengwen,et al."Factors Controlling the Difference in Brazilian and Direct Tensile Strengths of the Lac du Bonnet Granite".ROCK MECHANICS AND ROCK ENGINEERING 53.3(2020):1005-1019. |
入库方式： OAI收割
来源：地质与地球物理研究所
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