An Insight into the Excavation-Induced Stress Paths on Mechanical Response of Weak Interlayer Zone in Underground Cavern Under High Geostress
文献类型：期刊论文
| 作者 | Duan, Shu-Qian1,3; Jiang, Quan3; Liu, Guo-Feng2; Xiong, Jie-Cheng1; Gao, Po1; Xu, Ding-Ping3; Li, Ming-Yu1 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2021-01-19 |
| 页码 | 24 |
| ISSN号 | 0723-2632 |
| 关键词 | Weak interlayer zone High geostress Unloading stress paths Deformation and strength evolution Dilatation Failure mechanism |
| DOI | 10.1007/s00603-020-02312-y |
| 英文摘要 | A weak interlayer zone (WIZ) is a poor zonal geotechnical system with loose structure, weak mechanical properties, variable thickness, random distribution, and strong extension, that occurs between different rock strata (e.g., tuff and basalt), due to the intense tectonic movement, representing a potential threat to the overall stability of rock masses with WIZs in large underground cavern excavations. Focusing on the excavation-induced hazards in the weak interlayer zone (WIZ) occurring in underground cavern under high geostress, the mechanical response of WIZ under different loading and unloading stress paths has been well investigated and unearthed, by a series of automatic stress path controlled triaxial tests, as well as through scanning electron microscope (SEM) analysis. Results show that the mechanical characteristics of WIZ are closely related to the initial confining pressure and stress paths. Sudden increases in the circumferential strain and strong dilations of WIZ occur from the start of unloading, among which the unloading total strains are most strongly promoted by stress path II (i.e., axial pressure loading and confining pressure unloading), whereas the unloading stress path IV (i.e., axial pressure and confining pressure unloading) has the greatest promotion on enhancing the plastic volumetric dilatation. The deformation modulus and the Poisson's ratio follow a deterioration law under the unloading process of confining pressure, and it is the unloading stress path II that most influences the damage of elastic parameters. The ultimate bearing strength, the internal friction angle, and the cohesion of WIZ appear extremely obvious degradation in course of unloading, among which the damage effect of stress path IV is the most remarkable. The macroscopic and mesoscopic analyses reveal that the failure mechanism of WIZ under complicated unloading stress paths lays in the accumulation and propagation of axial and circumferential cracks and fractures, as well as pervasive particle breakage, with the intergranular fractures, transcrystalline fractures, and the shear scratches on a meso level. The research could provide an effective basis and good lessons for the mechanical response and failure mechanism of WIZ under unloading stress paths in underground cavern under high geostress. |
| 资助项目 | National Natural Science Foundation of China[51909241] ; National Natural Science Foundation of China[U1965205] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[Z017011] ; Scientific Research Key Project Fund of Colleges and Universities of Henan Province[19A560006] ; Chinese Scholar Council (CSC) |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | SPRINGER WIEN |
| WOS记录号 | WOS:000608944900001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/25616]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Jiang, Quan |
| 作者单位 | 1.Zhengzhou Univ, Sch Civil Engn, Zhengzhou 450001, Henan, Peoples R China 2.Changan Univ, Sch Highway, Xian 710064, Peoples R China 3.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 | Duan, Shu-Qian,Jiang, Quan,Liu, Guo-Feng,et al. An Insight into the Excavation-Induced Stress Paths on Mechanical Response of Weak Interlayer Zone in Underground Cavern Under High Geostress[J]. ROCK MECHANICS AND ROCK ENGINEERING,2021:24. |
| APA | Duan, Shu-Qian.,Jiang, Quan.,Liu, Guo-Feng.,Xiong, Jie-Cheng.,Gao, Po.,...&Li, Ming-Yu.(2021).An Insight into the Excavation-Induced Stress Paths on Mechanical Response of Weak Interlayer Zone in Underground Cavern Under High Geostress.ROCK MECHANICS AND ROCK ENGINEERING,24. |
| MLA | Duan, Shu-Qian,et al."An Insight into the Excavation-Induced Stress Paths on Mechanical Response of Weak Interlayer Zone in Underground Cavern Under High Geostress".ROCK MECHANICS AND ROCK ENGINEERING (2021):24. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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