滑坡涌浪对坝面冲击压力的影响因素研究

库区边坡在强震、暴雨等作用下发生的滑坡失稳破坏会对挡水大坝形成巨大的涌浪冲击作用。本文针对库区滑坡涌浪对坝面的冲击压力问题,采用光滑粒子水动力学(SPH)方法研究了涌浪生成传播过程以及坝面涌浪冲击压力的分布形式,分析了滑坡体宽度、入水速度以及库区水深等因素对滑坡涌浪波高、坝面冲击压力的影响。结果表明,随着滑坡体宽度的增加,最大浪高降低,但是稳定波高增加,坝面冲击压力增大;随着滑坡入水速度的增加,波浪高度增加,但当入水速度增加到一定程度后,坝面冲击压力变化不明显;随着库区水深的增加,首浪高度降低,坝面最大冲击压力以及距离水面的相对作用位置基本不变。

Study on the influence factors of landslide surge wave on the impact pressure on dam's surface

Slopesaround the reservoir area may be damaged by strong earthquake or rainstorm and slide into the reservoir which can induce huge surge hitting on dams. In this paper,the surge generation and propagation process and the distribution pattern of impacts on dam''s surface induced by landslide surge were studied using the smoothed particle hydrodynamics(SPH) method. The influences of particle space, initial falling velocity, water depth and slider width etc. on the surge wave height and impact pressure on dam surface were analyzed. The results show that the maximum wave height decreaseswith the increase of the width of the landslide mass, whereas the following wave amplitudes increase and intensity of impact pressure on dam surface increase; the amplitude of surge wave increases with the increase of initial falling velocity of landslide mass,whereas when it increases to exceed a certain extent,the intensity of impact pressure does not change obviously; the amplitude of the first surge wave height decreases with the increase of water depth of the reservoir, where the maximum impact pressure and its relative position to water surface are basically unchanged