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库岸古滑坡复活变形特征及双滑带稳定性响应
杨雨亭, 代贞伟, 陆愈实, 张晨阳, 闫慧, 侯雪峰, 唐俊刚
PDF(10641 KB)
PDF(10641 KB)
库岸古滑坡复活变形特征及双滑带稳定性响应
Deformation Characteristics and Stability Changes Characteristics of Reservoir Landslides with Double-Sliding Zones
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三峡库区存在大量的双滑带及多滑带古滑坡，目前对库岸双滑带滑坡变形复活特征及稳定性响应特征的研究较少.以塔坪滑坡为例，通过工程地质勘察和监测资料分析，揭示了该滑坡变形复活特征.并进一步开展了库水位和降雨联合作用下塔坪滑坡的渗流场和稳定性数值模拟计算，揭示了不同滑带对库水位波动和降雨的响应特征.结果表明，塔坪滑坡为阶梯式变形模式，每年的雨季和库水位下降期，滑坡变形速度增大.滑坡表现为显著的前缘牵引式渐进破坏模式.降雨主要对浅层滑带的稳定性产生较大的影响，对深层滑带的影响较小.库水位抬升，浅层滑带的稳定性降低，深层滑带的稳定性增大；库水位下降，浅层滑带的稳定性增大，深层滑带稳定性减小.
A large number of ancient landslides with double or multi sliding zones exist in the Three Gorge Reservoir (TGR) area. However, there are few studies on the deformation characteristics and stability changes characteristics of the reservoir landslide with double sliding zones under the action of reservoir water level (RWL) fluctuation. In this paper, the deformation characteristics of Taping landslide were obtained by filed investigation and the in-situ monitoring data. Furthermore, numerical simulation was carried out to investigate seepage filed and stability characteristics of the Taping landslide under RWL fluctuation and precipitation. Then the responses of the two different sliding zones in the Taping landslide to RWL fluctuation and precipitation were revealed. The result indicates that the Taping landslide shows a significant retrogressive failure pattern. Precipitation mainly has a greater influence on the shallow sliding zone, and the influence of precipitation on the deep sliding zone is low. As the RWL rises, the stability of the shallow sliding zone decreases and the stability of the deep sliding zone increases. As the RWL drops, the stability of the shallow sliding zone increases and the stability of the deep sliding zone decreases.
三峡库区 / 双滑带滑坡 / 复活变形特征 / 稳定性 / 工程地质学
the Three Gorge Reservoir area / landslide with double-sliding zone / reactivation and deformation characteristics / stability / engineering geology
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