Experimental and numerical study on failure characteristics and mechanism of coal under different quasi-static loading rates
文献类型：期刊论文
| 作者 | Liu, Xuewei1; Chen, Haixiao1,2; Liu, Bin1; Deng, Wei1,4; Liu, Quansheng1; Zhang, Zhizhen3 |
| 刊名 | THEORETICAL AND APPLIED FRACTURE MECHANICS
 |
| 出版日期 | 2022-10-01 |
| 卷号 | 121期号:-页码:- |
| 关键词 | Failure characteristics Coal Uniaxial compression Quasi-static loading PFC |
| ISSN号 | 0167-8442 |
| 英文摘要 | In mining engineering, mining rate is a significant factor for determining mining efficiency and safety. In the present work, uniaxial compression tests under different quasi-static loading rates (varying from 0.0005 mm/s to 0.01 mm/s), combined with high-speed digital image correlation (DIC) technique and numerical simulation, were conducted to study the mechanical strength and failure characteristics of coal samples. Experimental results show that strength parameters (including compressive strength, peak strain, elastic strain energy, and elastic modulus) initially increase rapidly, then the rate of increase slows as the loading rate continues to increase. Besides, with increasing loading rate, the failure mode of the coal samples gradually transitions from tension-shear to spalling-ejection failure, while full-field strain transitions from inclined shearing to vertical tensile strain distribution. Furthermore, the particle flow code (PFC) numerical simulation results indicate that the accumulative microcrack number increases and the microcracks inclination angle distribution range decreases approximately from 60? (60? - 120?) to 20? (80? - 100?) with increasing loading rate. Moreover, the micro damage and number of microcracks increase and macrocracks are more difficult to initiate as loading rate in-creases. As a result, the accumulated energy is less likely to be released and a more severe block ejection will occur for a sample under a high loading rate. |
| 学科主题 | Engineering ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:000830906700005 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35415]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 2.Faculty of Engineering, China University of Geosciences, Wuhan 430074, China 3.School of Mechanics and Civil Engineering, China University of Mining Technology, Xuzhou 221116, China 4.School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China |
| 推荐引用方式 GB/T 7714 | Liu, Xuewei,Chen, Haixiao,Liu, Bin,et al. Experimental and numerical study on failure characteristics and mechanism of coal under different quasi-static loading rates[J]. THEORETICAL AND APPLIED FRACTURE MECHANICS,2022,121(-):-. |
| APA | Liu, Xuewei,Chen, Haixiao,Liu, Bin,Deng, Wei,Liu, Quansheng,&Zhang, Zhizhen.(2022).Experimental and numerical study on failure characteristics and mechanism of coal under different quasi-static loading rates.THEORETICAL AND APPLIED FRACTURE MECHANICS,121(-),-. |
| MLA | Liu, Xuewei,et al."Experimental and numerical study on failure characteristics and mechanism of coal under different quasi-static loading rates".THEORETICAL AND APPLIED FRACTURE MECHANICS 121.-(2022):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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