Failure mechanism and deformation prediction of soft rock tunnels based on a combined finite-discrete element numerical method
文献类型：期刊论文
| 作者 | Deng, Penghai1,2,3; Liu, Quansheng1,2; Liu, Bin4; Lu, Haifeng1,2 |
| 刊名 | COMPUTERS AND GEOTECHNICS
 |
| 出版日期 | 2023-09-01 |
| 卷号 | 161页码:21 |
| 关键词 | Failure mechanism Deformation prediction Combined finite -discrete element method (FDEM) Soft rock tunnel Strength-stress ratio |
| ISSN号 | 0266-352X |
| DOI | 10.1016/j.compgeo.2023.105622 |
| 英文摘要 | The large deformation mechanisms and predictions of soft rock tunnels have always been important but difficult to solve problems in the field of geotechnical engineering. A combined finite-discrete element numerical simulation method (FDEM) was used to study large deformation mechanism, classification and prediction. The deformations or failure mechanisms of tunnel surrounding rock were revealed, and the failure modes and displacement value prediction of surrounding rock with different strength-stress ratios were also investigated. The following conclusions were obtained: (1) Critical hysteresis damping can be adopted to simulate the progressive large deformation process of soft rock tunnels, which can obtain the final deformation of unsupported tunnels and avoid a dynamic response. (2) Under concentrated tangential stress, the surrounding rock undergoes X-shaped conjugate shear fracture, and this type of fracture network continues to propagate toward the depth of the surrounding rock until the model reaches a stable state; the reduction in tunnel cross-section is mainly caused by the macroscopic movement and volume expansion of rock fragments, and the latter is due to the generation of a large number of macroscopic voids. (3) As the strength-stress ratio decreases, the deformation or failure modes of the surrounding rock can be divided into four categories: elastic-plastic deformation, closed fracturing, shear dilation and broken expansion. (4) Finally, a prediction equation for isotropic and homogeneous soft rock unsupported tunnel deformation with general size driven by hydrostatic in situ stress is obtained, which indicates that with an increasing strength-stress ratio, the surrounding rock displacement decreases as an exponential function, with a correlation coefficient of R2 = 0.997. In addition, the robustness and reliability of the prediction equation is verified. |
| 资助项目 | Natural Science Foundation of China[42107171] ; Natural Science Foundation of China[U21A20153] ; Natural Science Foundation of China[41941018] ; State Key Laboratory for Geo-Mechanics and Deep Underground Engineering, China University of Mining amp; Technology, Beijing[SKLGDUEK2218] |
| WOS研究方向 | Computer Science ; Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001030528600001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39019]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Liu, Quansheng |
| 作者单位 | 1.Wuhan Univ, Sch Civil Engn, Key Lab Safety Geotech & Struct Engn Hubei Prov, Wuhan 430072, Peoples R China 2.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn Sc, Wuhan 430072, Peoples R China 3.China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, 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 | Deng, Penghai,Liu, Quansheng,Liu, Bin,et al. Failure mechanism and deformation prediction of soft rock tunnels based on a combined finite-discrete element numerical method[J]. COMPUTERS AND GEOTECHNICS,2023,161:21. |
| APA | Deng, Penghai,Liu, Quansheng,Liu, Bin,&Lu, Haifeng.(2023).Failure mechanism and deformation prediction of soft rock tunnels based on a combined finite-discrete element numerical method.COMPUTERS AND GEOTECHNICS,161,21. |
| MLA | Deng, Penghai,et al."Failure mechanism and deformation prediction of soft rock tunnels based on a combined finite-discrete element numerical method".COMPUTERS AND GEOTECHNICS 161(2023):21. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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