脉动压力在消力池底板缝隙传播的瞬变流模型和渗流模型统一性探讨

Models for simulating the propagation of fluctuating pressure in gaps of stilling basin slab

消力池或水垫塘底板发生揭底破坏的主要原因是由于脉动压力在板块缝隙中传播,可能瞬时生成足以抵抗板块自重的脉动上举力,最终导致板块失稳破坏。本文针对脉动压力的两种传播模型,即瞬变流模型和渗流模型,分析其各自的优劣以及适用性,研究缝隙中脉动压力的传播机理。通过理论分析和数值模拟得出,这两种模型是内在统一的,但各自的适用性不同。瞬变流模型对缝隙严重堵塞情形或水力瞬变情形都适用。而渗流模型仅仅适用于缝隙中严重堵塞的情形。

Two models, namely transient flow model and seepage flow model respectively, are p describe the propagation of fluctuation pressure in gaps of stilling basin slab. The applicability, advantages and weak points of each model are investigated. The theoretical analysis and numerical simulation show that two models are in intrinsic consistent with each other but their applicability are different. The transient modelis is suitable for both situations in which the crevice is seriously blocked or hydraulic transient taken place, but the seepage model can only be used to describe the former situation.