Mechanical Behavior of Multi-fracturing Under Confining Pressure: Effects of Borehole Diameter and Rock Type
文献类型：期刊论文
| 作者 | Ma, Dongdong2; Wu, Yu1,2; Geng, Haozhe2; Ma, Xiao3; Zhang, Yiqun1; Pu, Hai1,2; Li, Lingyu4 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2024-09-11 |
| 页码 | 18 |
| 关键词 | Tensile strength Confining pressure Borehole diameter Stress state Failure criterion |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-024-04145-5 |
| 英文摘要 | The tensile strength of rock materials, a crucial factor for the stability of underground engineering, is much lower than its compressive strength. Moreover, the tensile strength of rock under confining pressure differs significantly from that of unconfined conditions, presenting a compelling avenue for investigation. In this work, the tensile strength of rock under confining pressure was tested using the multi-fracturing method. The effects of borehole diameter (i.e., 6, 8, 10, and 12 mm for granite) of hydraulic fracturing and rock type (i.e., granite, sandstone, and coal) on tensile strength were investigated, the evolution of tensile strength with confining pressure was elaborated, and its application in the failure criterion was elucidated. The results demonstrated that the breakdown pressure of hydraulic fracturing decreased with the borehole diameter at low confining pressure (i.e., sigma(3) = 2, 5 MPa), while the variation was minimal for high confining pressure (i.e., sigma(3) = 20, 30 MPa). Tensile strength exhibited a bulging phenomenon in response to changes in confining pressure, increasing to a bulging point and then gradually decreasing, with more pronounced changes observed in sandstone and coal. The pre-failure stress state sigma(1) > sigma(2) > sigma(3) at low confining pressure gradually converted toward sigma(1) > sigma(2) = sigma(3) at high confining pressure, contributing to the evolution of tensile strength into a bulging phenomenon. Furthermore, the tensile stress regime predicted by the Hoek-Brown criterion coincided with experimental data, with minor deviations for sandstone and granite. The researches facilitate a further understanding of the tensile properties in underground engineering. |
| 资助项目 | Funded by the Postgraduate Research & Practice Innovation Program of Jiangsu Province[KYCX24_2706] ; Postgraduate Research & Practice Innovation Program of Jiangsu Province[2024WLKXJ203] ; Graduate Innovation Program of China University of Mining and Technology[2023YFC3804205] ; National Key Research and Development Program of China |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001310422700001 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/42477]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Wu, Yu |
| 作者单位 | 1.China Univ Min & Technol, Sch Mech & Civil Engn, Xuzhou 221116, Jiangsu, Peoples R China 2.China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China 3.State Key Lab Struct Hlth & Safety Bridges, Wuhan 430034, Hubei, Peoples R China 4.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 | Ma, Dongdong,Wu, Yu,Geng, Haozhe,et al. Mechanical Behavior of Multi-fracturing Under Confining Pressure: Effects of Borehole Diameter and Rock Type[J]. ROCK MECHANICS AND ROCK ENGINEERING,2024:18. |
| APA | Ma, Dongdong.,Wu, Yu.,Geng, Haozhe.,Ma, Xiao.,Zhang, Yiqun.,...&Li, Lingyu.(2024).Mechanical Behavior of Multi-fracturing Under Confining Pressure: Effects of Borehole Diameter and Rock Type.ROCK MECHANICS AND ROCK ENGINEERING,18. |
| MLA | Ma, Dongdong,et al."Mechanical Behavior of Multi-fracturing Under Confining Pressure: Effects of Borehole Diameter and Rock Type".ROCK MECHANICS AND ROCK ENGINEERING (2024):18. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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