某水库崩积坡坍岸模型模拟预测

针对某水库蓄水后库区崩积坡因水环境改变引起的库岸再造坍岸问题,结合现场崩积物分布发育和历史洪水坍岸调查成果,开展了不同稳定坡角和水位条件下的室内模型试验研究,进行了图解法坍岸宽度预测和极限平衡法坍岸稳定计算,并对库区崩积坡坍岸进行了综合评价。模型试验揭示的崩积坡坍岸模式与现场历史洪水坍岸特征较接近,图解法和极限平衡法结果吻合较好。定量预测的库区典型崩积坡坍岸宽度和高程为水库工程建设和移民安置提供了技术支持。

Model simulation and prediction on colluvial slope bank collapse of a Reservoir

In accordance with the problem of the bank re-collapse from the colluvial slope of Xiangjiaba Reservoir due to the change of the water environment after the impoundment of it，the lab-model test under conditions of various stable slopes angle and water levels is made in combination with the data from the investigation on the distribution and development of the colluvial deposits and the bank collapses during the historic floods，while the graphic method based prediction on the width of bank collapse and the bank collapse stability calculation made by limit equilibrium method are carried out along with the comprehensive evaluation on the bank collapse of colluvial slope within the reservoir area. The model test shows that the bank collapse mode of the colluvial slope is relatively close to the features of the bank collapses occurred during those in situ historic floods therein，furthermore，the results from both the graphic method and the limit equilibrium method are better coincided. On the whole，the quantitively predicted typical width and height of the bank collapse of colluvial slope can provide technical support for the construction of the reservoir and the resettlement concerned.