Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deterioration
Since the Three Gorges Reservoir went into service, the rock mass in the hydro-fluctuation belt of the bank slope has obviously deteriorated, which accelerates the instability of the bank slope. The potential debris avalanche threatens the safety of the Yangtze River waterway. The Banbiyan unstable...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
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Institute of Geomechanics, Chinese Academy of Geological Sciences
2022-12-01
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| Series: | Dizhi lixue xuebao |
| Subjects: | |
| Online Access: | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222821 |
| _version_ | 1811164975546236928 |
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| author | CHEN Yunfei ZHANG Peng HUANG Bolin QIN Panpan LI Qiuwang |
| author_facet | CHEN Yunfei ZHANG Peng HUANG Bolin QIN Panpan LI Qiuwang |
| author_sort | CHEN Yunfei |
| collection | DOAJ |
| description | Since the Three Gorges Reservoir went into service, the rock mass in the hydro-fluctuation belt of the bank slope has obviously deteriorated, which accelerates the instability of the bank slope. The potential debris avalanche threatens the safety of the Yangtze River waterway. The Banbiyan unstable rock mass in the Three Gorges Reservoir area was studied using the shear strength reduction method to analyze the failure process and long-term stability of the unstable rock mass under rock deterioration. The results show that the Banbiyan unstable rock mass is stable under natural working conditions. Under reservoir water and rock mass deterioration, the tensile stress is concentrated at the central section. The tensile cracks gradually penetrate up and down, extending to the prominent controlling cracks at the top and the bottom base fracture zone. Slip-shear failure may occur. Under the condition of reservoir water combined with rock mass deterioration and heavy rainfall, the strength of the rock mass decreases by 30% after about 40 hydrological cycles, and the stability coefficient of the Banbiyan unstable rock mass decreased to about 1.14, which is an under-stable state. It is suggested to carry out engineering prevention and control to improve the stability of dangerous rock mass to ensure the safety of the waterway. The research results can provide a scientific and reasonable basis for disaster prevention and mitigation of the Banbiyan and similar unstable rock masses in the Three Gorges Reservoir area. |
| first_indexed | 2024-04-10T15:30:01Z |
| format | Article |
| id | doaj.art-40db1b7aca9941198a28386b047c57fb |
| institution | Directory Open Access Journal |
| issn | 1006-6616 |
| language | zho |
| last_indexed | 2024-04-10T15:30:01Z |
| publishDate | 2022-12-01 |
| publisher | Institute of Geomechanics, Chinese Academy of Geological Sciences |
| record_format | Article |
| series | Dizhi lixue xuebao |
| spelling | doaj.art-40db1b7aca9941198a28386b047c57fb2023-02-14T01:15:04ZzhoInstitute of Geomechanics, Chinese Academy of Geological SciencesDizhi lixue xuebao1006-66162022-12-0128693894710.12090/j.issn.1006-6616.20222821dzlxxb-28-6-938Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deteriorationCHEN YunfeiZHANG PengHUANG BolinQIN PanpanLI QiuwangSince the Three Gorges Reservoir went into service, the rock mass in the hydro-fluctuation belt of the bank slope has obviously deteriorated, which accelerates the instability of the bank slope. The potential debris avalanche threatens the safety of the Yangtze River waterway. The Banbiyan unstable rock mass in the Three Gorges Reservoir area was studied using the shear strength reduction method to analyze the failure process and long-term stability of the unstable rock mass under rock deterioration. The results show that the Banbiyan unstable rock mass is stable under natural working conditions. Under reservoir water and rock mass deterioration, the tensile stress is concentrated at the central section. The tensile cracks gradually penetrate up and down, extending to the prominent controlling cracks at the top and the bottom base fracture zone. Slip-shear failure may occur. Under the condition of reservoir water combined with rock mass deterioration and heavy rainfall, the strength of the rock mass decreases by 30% after about 40 hydrological cycles, and the stability coefficient of the Banbiyan unstable rock mass decreased to about 1.14, which is an under-stable state. It is suggested to carry out engineering prevention and control to improve the stability of dangerous rock mass to ensure the safety of the waterway. The research results can provide a scientific and reasonable basis for disaster prevention and mitigation of the Banbiyan and similar unstable rock masses in the Three Gorges Reservoir area.https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222821three gorges reservoir areabanbiyanunstable rock massrock mass deteriorationlong-term stability |
| spellingShingle | CHEN Yunfei ZHANG Peng HUANG Bolin QIN Panpan LI Qiuwang Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deterioration Dizhi lixue xuebao three gorges reservoir area banbiyan unstable rock mass rock mass deterioration long-term stability |
| title | Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deterioration |
| title_full | Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deterioration |
| title_fullStr | Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deterioration |
| title_full_unstemmed | Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deterioration |
| title_short | Failure process and long-term stability analysis of typical unstable rock mass in the Three Gorges Reservoir area considering rock mass deterioration |
| title_sort | failure process and long term stability analysis of typical unstable rock mass in the three gorges reservoir area considering rock mass deterioration |
| topic | three gorges reservoir area banbiyan unstable rock mass rock mass deterioration long-term stability |
| url | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222821 |
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