采用大型商业软件Fluent,模拟三维情况下溃坝波对单桥墩冲击影响,分析溃坝波通过桥墩区时桥墩受到的的压力系数变化过程。分析结果表明,由于桥墩的阻碍作用,溃坝波在桥墩上游形成雍高,并且形成破碎；溃坝波作用于桥墩,造成压力系数急剧增大,且持续时间很短；溃坝波作用下,桥墩所受压力系数是一个先增大后减小的过程,且增大速率快于减小速率。研究成果可以为桥墩安全设计和暴雨时节安全防护提供一定的理论依据。%This paper uses large commercial software Fluent to simulate the hydraulic characteristics of single bridge pier which impact by dam-break wave. This study were based on three-dimension-al model and focused on analyze the pressure coefficient hydrograph of bridge pier during the dam-break wave passing. The analysis shows that the wave will run up on the upstream side of bridge pier and result wave breaking at two sides due to the resist of bridge pier; the pressure coefficient would increase to a peak point when dam-break wave impact; the change of pressure coefficient hydro-graph shape was first increase rapid and the then decrease slowly. The study of this paper can provide theoretical direction for bridge design and safety protection in time of cloudburst.
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