水垫塘底板稳定水力要素的试验研究及数值模拟

The Experimental Study and Numerical Simulation on Hydraulic Factors of Water Cushion Pond Floor Stability

以已实施sk拱坝为研究背景,通过模型试验从泄水建筑出口体型优化的角度对影响水垫塘底板稳定的水力要素冲击压力P进行分析。研究表明,通过优化泄水建筑出口体型,可以使入射水舌在空间更加分散,从而达到减小消能塘底板压力的效果。通过数值模拟对水垫塘底板压力分布及允许值、失稳位置进行研究,物模试验和数模分析均表明最不利板通常位于水舌落点之后,由于表底孔全开联合泄洪,底孔泄流时在一定程度上抵消了表孔泄流对于底板的冲击作用。

Taking sk arch dam as the research background,this paper analyzes the hydraulic factor impact pressure P that affects the stability of the bottom plate of the plunge pool from the angle of outlet shape optimization of the drain building through model tests,and draws the conclusion that by optimizing the outlet shape of the drain building,the jet tongue can be more dispersed in space,thus achieving the effect of reducing the bottom plate pressure of the energy dissipation pool.The pressure distribution,allowable value and instability position of the bottom plate of the plunge pool are studied by numerical simulation.Both the physical model test and the numerical simulation analysis show that the most unfavorable plate is usually located behind the drop point of the water tongue.As the surface and bottom outlets are fully opened for combined flood discharge,the impact of the surface orifice discharge on the bottom plate is offset to some extent when the bottom outlet discharges.