ISSN 1003-8035 CN 11-2852/P
    胡雷,张鹏,黄波林. 三峡库区典型岩溶岸坡危岩体失稳模式和长期稳定性分析[J]. 中国地质灾害与防治学报,2023,34(5): 64-73. DOI: 10.16031/j.cnki.issn.1003-8035.202205039
    引用本文: 胡雷,张鹏,黄波林. 三峡库区典型岩溶岸坡危岩体失稳模式和长期稳定性分析[J]. 中国地质灾害与防治学报,2023,34(5): 64-73. DOI: 10.16031/j.cnki.issn.1003-8035.202205039
    HU Lei,ZHANG Peng,HUANG Bolin. Analysis of failure modes and long-term stability of dangerous rock mass on typical karst bank slope in the Three Gorges Reservoir area[J]. The Chinese Journal of Geological Hazard and Control,2023,34(5): 64-73. DOI: 10.16031/j.cnki.issn.1003-8035.202205039
    Citation: HU Lei,ZHANG Peng,HUANG Bolin. Analysis of failure modes and long-term stability of dangerous rock mass on typical karst bank slope in the Three Gorges Reservoir area[J]. The Chinese Journal of Geological Hazard and Control,2023,34(5): 64-73. DOI: 10.16031/j.cnki.issn.1003-8035.202205039

    三峡库区典型岩溶岸坡危岩体失稳模式和长期稳定性分析

    Analysis of failure modes and long-term stability of dangerous rock mass on typical karst bank slope in the Three Gorges Reservoir area

    • 摘要: 三峡库区地质环境复杂,受库水位升降作用影响岩溶岸坡消落区岩体劣化,加快了岸坡不稳定性发展。文章以三峡库区黄岩窝危岩体为研究对象,现场详查了消落带岩体劣化现象,计算了危岩体的长期稳定性数值。研究表明:黄岩窝危岩体存在垂直岩溶带和底部渗流带;底部渗流带处于消落带部位,存在软弱区和岩体劣化现象。考虑库水位和暴雨时岩溶水压岸坡稳定性系数为1.69,危岩体处于稳定状态。随着岩体劣化导致底部软弱区岩体参数不断下降,稳定性系数年均下降约0.01。预测在约57个周期性水位变动之后黄岩窝危岩体变为欠稳定状态,62个周期后发生失稳破坏。危岩体的破坏模式是顶部出现岩块倾倒崩落和底部软弱区贯通之后发生滑移的复合式破坏,与野外调查定性认识基本一致。研究结果对库区类似的地质灾害预警和防治有着重要的指导意义。

       

      Abstract: The Three Gorges Reservoir area presents a complex geological environment, where the deterioration of rock masses in the riparian zone of karst bank slopes is expedited by the fluctuating reservoir water levels of the reservoir, thereby hastening the evolution of the bank slopes towards instability. This study focuses on the Huangyanwo dangerous rock mass in the Three Gorges Reservoir area. A comprehensive filed investigation was conducted to scrutinize the deterioration phenomenon of rock masses within the water–level fluctuation zone, and a numerical analysis was performed to assess the long–term stability of the dangerous rock mass. The findings reveal the presence of a vertical karst zone and a bottom seepage zone in the Huangyanwo dangerous rock mass. The bottom seepage zone is situated within the water–level–fluctuation zone, characterized by areas of weakness and rock mass deterioration. Considering the influence of reservoir water levels and rainfall events, the stability coefficient of karst water pressure on the bank slope is calculated to be 1.69, indicating that the dangerous rock mass remains stable. Nevertheless, due to the progressive deterioration of rock mass parameters within the weak area at the bottom, the stability coefficient experiences an annual decline of approximately 0.01. It is predicted that the Huangyanwo dangerous rock mass will transition to an unstable state after approximately 57 cycles of periodic water level variations, and the instability failure will occur after 62 cycles. The failure mode of the dangerous rock mass involves a compound failure mechanism of toppling and sliding subsequent to the connection of the weak zone at the bottom, aligning closely with the qualitative understanding grained from field investigations. The research results hold significant instructive implications for the early warning and prevention strategies concerning analogous geological disasters in reservoir areas.

       

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