The Sequence of Heating and Loading Affects Shear Properties of Granite Fractures Under High Temperature
文献类型：期刊论文
| 作者 | Meng, Fanzhen1; Han, Jianhua1; Li, Zhiyuan1; Wang, Feili1; Yue, Zhufeng1; Cai, Qijin1; Cui, Guanghao1; Zhou, Hui2 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2024-04-21 |
| 页码 | 24 |
| 关键词 | Granite fracture High temperature Acoustic emission Shear strength Stress drop |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-024-03885-8 |
| 英文摘要 | In deep tunneling and mining, high-level radioactive waste repositories, and geothermal reservoirs, the rock fractures are typically in the thermal-mechanical coupled condition. It is crucial to precisely replicate the geoenvironment in the lab, including stress, temperature, boundary conditions, and other factors, to derive trustworthy strength estimates for rock fractures. Utilizing the recently developed shear apparatus, we performed direct shear tests on rough granite fractures under thermal-mechanical coupled loading (room temperature to 400 degrees C, 1-30 MPa) to address the effects of normal stress and high in-situ temperature on the shear behavior of rough granite fractures, and the sequence of heating and normal loading on the strength parameters is also examined. Results show that the acoustic emission is more active if the fracture is heated under a large normal stress, while the expansion in the normal direction is more restricted. Besides, the shear strength tends to increase with increasing temperature, particularly if the fracture is heated under a large normal stress; at the greatest temperature, the shear strength is deteriorated. The strengthening of rock fracture upon heating is associated with the time- and temperature-dependent asperity contact creep which increases the real contact area of the macroscopically mated fracture surfaces. The sequence of heating and normal loading prominently affects the shear properties of granite fractures; the shear strength, post-peak stress drop and stick-slip amplitude are greater for granite fractures which were normal loaded first than heated first. The post-peak stress drop and stick-slip stress drop, which are vital parameters to estimate the seismic event intensity, are related to the corresponding dynamic slip and loading system stiffness. Direct shear tests were conducted on granite fractures with a newly developed apparatus equipped with real-time heating capability.The thermal expansion is smaller while the AEs are more active when the fractures were heated under a larger normal stress.The shear strength of granite fractures first increases and then decreases with increasing temperature when heated under a large normal stress.The shear strength, post-peak stress drop and stick-slip are greater for granite fractures which were normal loaded first than heated first.The strengthening of fractures heated under a large pre-set normal stress is related to increase in fracture contact area due to asperities creep. |
| 资助项目 | Taishan Scholar Foundation of Shandong Province[2019KJG002] ; Taishan Scholar Foundation of Shandong Province[2019RKB01083] ; Taishan Scholars Program[52309130] ; National Natural Science Foundation of China[ZR2022QD004] ; Natural Science Foundation of Shandong Province |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001205958800002 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/41093]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Meng, Fanzhen; Zhou, Hui |
| 作者单位 | 1.Qingdao Univ Technol, Coll Sci, Qingdao 266033, Shandong, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Meng, Fanzhen,Han, Jianhua,Li, Zhiyuan,et al. The Sequence of Heating and Loading Affects Shear Properties of Granite Fractures Under High Temperature[J]. ROCK MECHANICS AND ROCK ENGINEERING,2024:24. |
| APA | Meng, Fanzhen.,Han, Jianhua.,Li, Zhiyuan.,Wang, Feili.,Yue, Zhufeng.,...&Zhou, Hui.(2024).The Sequence of Heating and Loading Affects Shear Properties of Granite Fractures Under High Temperature.ROCK MECHANICS AND ROCK ENGINEERING,24. |
| MLA | Meng, Fanzhen,et al."The Sequence of Heating and Loading Affects Shear Properties of Granite Fractures Under High Temperature".ROCK MECHANICS AND ROCK ENGINEERING (2024):24. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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