Progressive Transition from Extension Fracture to Shear Fracture of Altered Granite During Uniaxial Tensile Tests
文献类型：期刊论文
| 作者 | Liu, Shijie3; Lan, Hengxing2,3; Martin, C. Derek1 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2022-06-18 |
| 页码 | 21 |
| ISSN号 | 0723-2632 |
| 关键词 | Altered granite Tensile failure Micro mechanism Hybrid fracture Fracturing mode transition Crack initiation and propagation |
| DOI | 10.1007/s00603-022-02897-6 |
| 通讯作者 | Lan, Hengxing(lanhx@igsnrr.ac.cn) |
| 英文摘要 | A high degree of alteration causes swelling, disintegration and argillization of granite and thus weakens its physical and mechanical properties. Very few experimental studies, however, have been conducted to quantitatively characterize the strong-to-weak transition of the mechanical behaviours of granite affected by varying degrees of alteration. A new miniature tensile instrument system, which can visualize the failure process and simultaneously record the stress-strain curves, was utilized to test the tensile strength of dog-bone sliced samples of altered granite. Meanwhile, an improved quantitative method was proposed to characterize the alteration degree. The results demonstrate that the tensile strength of granite decreases significantly with increasing alteration rate, while the strain at the peak strength and fracture angle increase. Additionally, the orientation of weaker crystals and the mineral size distribution significantly affect fracture propagation. But the effect will be weakened as the alteration rate increases. On the basis of fracture angle, tensile peak strength, strain at peak strength, and microscopy images of crack initiation and propagation, three major classes of fractures are identified from the test results: (1) extension fracture at a low alteration rate: crack initiates and propagates along biotite-brittle mineral interfaces; (2) shear fracture at a high alteration rate: intragranular crack initiates within altered feldspar and propagates along the interior of altered mineral grains; (3) hybrid fracture at a moderate alteration rate: the above two failure phenomena coexist. A simple model that considers the fracture process of altered granite was proposed to explain the transition from extension fracture to shear fracture. |
| WOS关键词 | GEOLOGICAL CHARACTERISTICS ; STATISTICAL TECHNIQUES ; DIAMETRAL COMPRESSION ; ACOUSTIC-EMISSION ; TIBETAN PLATEAU ; ROCK TYPES ; STRENGTH ; CLASSIFICATION ; DEFORMATION ; MICROCRACKS |
| 资助项目 | Second Tibetan Plateau Scientific Expedition and Research (STEP) program[2019QZKK0904] ; National Natural Science Foundation of China[41941019] ; National Key R&D Program of China[2019YFC1520601] |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | SPRINGER WIEN |
| WOS记录号 | WOS:000812464100001 |
| 资助机构 | Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; National Natural Science Foundation of China ; National Key R&D Program of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/179587]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Lan, Hengxing |
| 作者单位 | 1.Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2W2, Canada 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China 3.Changan Univ, Coll Geol Engn & Geomat, Xian 710054, Shaanxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Shijie,Lan, Hengxing,Martin, C. Derek. Progressive Transition from Extension Fracture to Shear Fracture of Altered Granite During Uniaxial Tensile Tests[J]. ROCK MECHANICS AND ROCK ENGINEERING,2022:21. |
| APA | Liu, Shijie,Lan, Hengxing,&Martin, C. Derek.(2022).Progressive Transition from Extension Fracture to Shear Fracture of Altered Granite During Uniaxial Tensile Tests.ROCK MECHANICS AND ROCK ENGINEERING,21. |
| MLA | Liu, Shijie,et al."Progressive Transition from Extension Fracture to Shear Fracture of Altered Granite During Uniaxial Tensile Tests".ROCK MECHANICS AND ROCK ENGINEERING (2022):21. |
入库方式： OAI收割
来源：地理科学与资源研究所
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