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库区滑坡涌浪三维数值模拟分析
邓成进
中国电建集团西北勘测设计研究院有限公司
摘要:
本文针对某水库区的3#变形体滑坡涌浪问题,采用三维数值模拟分析库区滑坡涌浪传播过程,研究网格尺寸对数值分析计算精度的影响,同时建立1:280的水工物理模型试验进行验证,并与潘家铮法计算的涌浪高度进行对比。结果表明,数值分析计算精度与模型网格尺寸、涌浪剧烈程度、涌浪传播距离有关;三维数值分析和模型试验得到涌浪高度变化曲线的趋势基本一致,涌浪传播至坝前时,各种方法得到坝前涌浪高度误差较小,数值分析结果可作为大坝安全影响的评价依据。3#变形体形成的涌浪在第5次波峰(t=151s)超过坝顶超高约8.37 m,仅占最大坝高的3.3%,且过流量有限,不会对大坝安全构成威胁。
关键词:  滑坡涌浪  数值分析  模型实验  大坝安全
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Three-dimensional numerical simulation analysis of landslide surge in reservoir area
dengchengjin
Northwest Engineering Corporation Limited
Abstract:
Aiming at the 3 # deformable body landslide surge in a reservoir area, this paper uses three-dimensional numerical simulation to analyze the landslide surge propagation process in the reservoir area, and the effect of grid size on the accuracy of numerical analysis calculations is studied. Meanwhile, a 1:280 hydraulic physical model test is established for verification, and those results are compared with the surge height calculated by the Pan's method. The results show that the calculation accuracy of numerical analysis is related to the model grid size, the severity of the swell, and the distance of the swell. The three-dimensional numerical analysis and model tests have basically the same trend of the swell height. When the surge wave spreads to the front of the dam, the error of the surge height obtained by various methods is small, and the numerical analysis results can be used as the basis for evaluating the dam safety impact. The swell formed by 3# deformation body surpassed the dam crest by about 8.37m at the 5th peak (t=151s), only 3.3% of the maximum dam height, and the overflow was limited, which would not pose a threat to dam safety.
Key words:  landslide surge  numerical simulation  model test  dam safety
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