恩子坪2#滑坡体稳定性数值模拟

恩子坪2^#滑坡体位于白鹤滩水电站下游约8.6 km处,属于典型的基岩—顺层滑坡。为了研究该滑坡体的变形破环特征,通过物理模拟试验从成因机制对其稳定性进行定性分析;同时,结合工程勘察资料,采用数值模拟方法,论述了不同工况下滑坡体的位移、应力及变形规律。结果表明:物理模拟试验与数值模拟相结合是分析滑坡成因机制的有效途径;滑坡体的位移量由基岩到滑体逐渐增大,洪水位工况下最大位移量为185 cm,其变形主要发生于滑体;最大拉应力出现在滑坡体的水下堆积物处。自然状态下,滑坡体基本稳定,安全系数为1.065 6;洪水位工况下,滑坡体安全系数降低至0.76,此时,滑坡体趋向于不稳定,滑体前缘可能出现局部失稳下滑。通过对典型滑坡稳定性的深入研究,可为类似破坏机制的滑坡稳定性分析提供参考。

Numerical Simulation on Stability of Enziping 2# Landslide Mass

The Enziping 2^# landslide is a typical bedrock bedding landslide located at about 8.6 km downstream of Baihetan Hydropower Station. We analyzed the stability of the landslide qualitatively by means of physical simulation tests, and meanwhile discussed the laws of displacement, stress, and deformation changes under different working conditions via numerical simulation based on engineering investigation data. Results suggest that the combination of physical simulation and numerical simulation is an effective approach to analyzing the causes of landslide formation. The displacement of landslide increased gradually from bedrock to sliding body, with the maximum displacement reaching 185 cm under flood level condition, and the deformation mainly occurring in sliding body. The maximum tensile stress was found at the underwater accumulation of the landslide. It natural state, the landslide was stable, and the safety coefficient was 1.065 6; under flood level condition, the safety factor of landslide reduced to 0.76 when the landslide tended to be unstable and the front edge of the slide was likely to suffer from local buckling down.