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高拱坝枢纽采用坝身泄洪、水垫塘消能是一种较好的布置型式，但水垫塘底板的型式和尺寸及其泄洪时稳定性是它的关键技术问题。本文所研究的拱形底板是一种新型的底板型式。通过实验分析，研究了冲击射流下拱形底板失稳型式，量测了底板上、下表面压强分布，概化了时均上举力（上、下表面时均压强差）的计算公式，实测了动水荷载作用下拱端推力。研究表明：拱形底板具有整体稳定性特征，它可能是高拱坝大流量泄洪水垫塘比较理想的保护型式。
The high arch dam hub adopts dam body flood discharge, and the water cushion pond dissipates energy is a better layout type. However, the type and size of the plunge pool floor plate and its stability when discharging flood waters are its key technical problems. The arched floor studied in this paper is a new type of floor. Through experimental analysis, the failure modes of arched bottom plate under impact jet were studied, and the pressure distributions on the upper and lower surfaces of the bottom plate were measured. The formulas for calculating the lifting force per hour (upper pressure difference and lower pressure difference) were summarized. Under the action of hydrodynamic load arch end thrust. The research shows that the arched floor has the characteristics of overall stability, which may be the ideal type of protection for flood discharge plunge pool with high flow in high arch dam.