Investigation on model-I fracture toughness of sandstone with the structure of typical bedding inclination angles subjected to three-point bending
文献类型：期刊论文
| 作者 | Zhao, Yu; Zheng, Kun; Wang, Chaolin; Bi, Jing; Zhang, Hua |
| 刊名 | THEORETICAL AND APPLIED FRACTURE MECHANICS
 |
| 出版日期 | 2022-06-01 |
| 卷号 | 119 |
| 关键词 | Crack initiation toughness Unstable fracture toughness Double-K fracture criterion Double-G fracture criterion Acoustic emission |
| ISSN号 | 0167-8442 |
| 英文摘要 | The fracture mechanics behaviors of rock with bedding plane structure have considerable influences on rock mass engineering, among which crack initiation toughness (K-Iini) and unstable fracture toughness (K-Iun) play a significant role. This work first adopts the classical equivalent elastic fracture theories from different perspectives to precisely determine K-Iun. Then the double-K fracture criterion (DKFC) and the double-G fracture criterion (DGFC) are employed to inversely compute K-Iini through cohesive fracture toughness (K-Ic). The experimental results indicate that the crucial strength and deformation parameters show obvious weakening trends as the bedding direction varies from horizontal to vertical for stratified sandstone under standard three-point bending with a loading rate of 0.0001 mm/s. Furthermore, there are little differences in K-Iun among three common calculation methods, including the ASTM standard, the Guinea proposed method, and the energy release rate. The average values of K-Iun are 8.20 MPa.mm(1/2), 7.38 MPa.mm(1/2), 4.76 MPa.mm(1/2), and 4.49 MPa.mm(1/2) for the tested specimens with bedded orientation angles 0 degrees, 30 degrees, 60 degrees, and 90 degrees, respectively. However, there is a remarkable difference between K-Iini(K) evaluated by the DKFC and K-Iini(G) evaluated by the DGFC, and two relationships are satisfied as KIiniK = 0.42K(Iun) and K-Iini(G) = 0.30K(Iun). Additionally, the applicability of the DKFC and the DGFC is validated by the acoustic emission (AE) technique. The comparisons manifest that the crack initiation toughness evaluated by the AE counts and cumulative AE counts is consistent with that of the DGFC. The leading significances for this study are to explore the application of various fracture mechanics theories to three-point bending specimens and provide fracture mechanics parameters for underground engineering and tunnel engineering. |
| 学科主题 | Engineering ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:000790443000007 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34997]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS 2.Guizhou University; |
| 推荐引用方式 GB/T 7714 | Zhao, Yu,Zheng, Kun,Wang, Chaolin,et al. Investigation on model-I fracture toughness of sandstone with the structure of typical bedding inclination angles subjected to three-point bending[J]. THEORETICAL AND APPLIED FRACTURE MECHANICS,2022,119. |
| APA | Zhao, Yu,Zheng, Kun,Wang, Chaolin,Bi, Jing,&Zhang, Hua.(2022).Investigation on model-I fracture toughness of sandstone with the structure of typical bedding inclination angles subjected to three-point bending.THEORETICAL AND APPLIED FRACTURE MECHANICS,119. |
| MLA | Zhao, Yu,et al."Investigation on model-I fracture toughness of sandstone with the structure of typical bedding inclination angles subjected to three-point bending".THEORETICAL AND APPLIED FRACTURE MECHANICS 119(2022). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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