澜沧江流域某水电站危险区域识别及溃决过程模拟

Identification of Dangerous Areas in Dam Body and Simulation of Dam Collapse Process of a Hydropower Station in Lancang River Basin

保证坝体稳定是水利水电工程的关键,在洪水及地质运动的作用下,大坝溃坝风险将会增加,一旦发生溃坝将会造成严重的经济、社会损失。以澜沧江某混凝土重力坝为例,开展坝体危险区域识别及溃决过程分析。利用有限元方法对坝体在洪水作用下的应力、应变进行研究,发现当水位漫顶时坝顶中心点位置位移最大,当伴有近场强震时,该区域极有可能发生破坏导致溃坝;利用HEC-RAS软件对该种工况的洪水演进情况进行了分析。

Ensuring the stability of dam body is the key to water conservancy and hydropower projects.Under the action of floods and geological movements,the risk of dam failure will increase.Once a dam failure occurs,it will cause serious economic and social losses.Taking a concrete gravity dam on Lancang River as an example,the dangerous areas of dam body are identified,and the failure process of dam is analyzed.The finite element method is used to study the stress and strain of dam body under the action of floods.It is found that the displacement of the center point of dam crest is the largest when the water level overflows,and when accompanied by strong near-field earthquakes,the damage in this area is very likely to cause dam collapse.The flood evolution under the condition of dam collapse is analyzed by the HEC-RAS software.