Deformation characteristics and reactivation mechanism of Hongyanzi landslide in Pubugou reservoir area of the Dadu River
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摘要:
库水涨落常诱发库岸滑坡变形破坏。为了研究库岸滑坡的变形特征及变形机理,以大渡河瀑布沟水电站红岩子滑坡为对象,通过详细的地表宏观变形调查和对监测数据的深入分析,结合GeoStudio数值模拟,深入研究了该滑坡的变形特征、渗流场、稳定性及库水对滑坡的作用机理。结果表明:红岩子滑坡地表宏观变形显著,累计位移曲线呈“阶跃”式特征,库水下降是滑坡变形的主要诱发因素;库水位由850 m高水位集中下降至830 m以下时,位移阶跃启动,“阶跃”段的累计变形量占全年总变形量的90%以上,当库水位下降速率大于0.5 m/d时,滑坡加速变形;滑坡变形模式为蠕滑-拉裂,库水升降导致滑体内部渗透力的变化,对滑坡稳定性影响很大,引发滑坡“阶跃”变形。
Abstract:Reservoir water fluctuation can often trigger deformation and failure of reservoir bank landslides. This study focuses on the Hongyanzi landslide in the Pubugou hydropower Station of the Dadu River to investigate the deformation characteristics and deformation mechanisms of the reservoir bank landslides. Through detailed surface macro deformation surveys, monitoring data analysis, and GeoStudio numerical simulation, the deformation characteristics, seepage field, stability and the influence of reservoir water on landslide were studied in depth. The research revealed significant macro deformation of the Hongyanzi landslide surface, with a cumulative displacement curve exhibiting a “step-like” characteristic. The primary inducing factor of landslide deformation was found to be the decrease in the reservoir water level. When the reservoir water level dropped from 850 m to below 830 m, the displacement step was triggered, and the cumulative deformation of the “step” segment accounted for over 90% of the total annual deformation. Accelerated deformation of the landslide occurred when the rate of the reservoir water level decline was greater than 0.5 m/d. The landslide deformation mode was identified as creep slip-tensile cracking, with the rise and fall of the reservoir water level significantly impacting the internal permeability of the sliding body and causing a large impact on the landslide’s stability, leading to the “step-like” deformation of the landslide.
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Key words:
- reservoir water level /
- deformation characteristics /
- deformation mechanism /
- step /
- Hongyanzi landslide
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表 1 滑坡变形加速阶段库水下降速率均值
Table 1. Summary table of mean decline rate of reservoir water during landslide deformation acceleration phase
年份 日期 库水下降速率/(m·d−1) 2013 3月1日—3月22日 0.76 3月27日—4月12日 0.72 4月15日—4月17日 0.87 2014 3月2日—3月9日 0.59 4月4日—4月10日 0.67 4月15日—4月25日 0.91 2018 1月23日—2月10日 0.85 3月27日—3月31日 0.56 2019 2月22日—3月2日 0.72 3月22日—4月2日 0.89 4月26日—4月29日 0.70 表 2 滑坡物理力学参数
Table 2. Physical and mechanical parameters of the landslide
岩性 重度
/(kN·m−3)黏聚力
/kPa内摩擦角
/(°)渗透系数
/(m·d−1)堆积层 20 20 15 0.450 基岩 26 3200 44 0.001 表 3 滑坡计算参数
Table 3. Landslide calculation parameters
编号 模拟工况 荷载组合 I 降雨 自重+2013年真实降雨 II 降雨+库水 自重+2013年真实降雨+2013年库水位 -
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