反拱水垫塘拱端结构稳定的研究

Research on Structure and Stability at Arch Spandrels of Inverted Arch Plunge Pool

利用冲击射流理论和重力相似准则及同时满足紊流阻力相似的条件,建立了高水头、大流量作用下反拱水垫塘精细模型。在拱圈底板块止水设施破坏和底板块锚固失效的条件下,研究了拱端轴力的变化规律。试验和分析表明,沿水流方向,拱端力在冲击点上下游各0.1 m附近达到最大,沿流程衰减;拱端力大小随拱圈振动底板块数目的增多而增大;通过转换得到拱端最大受压强度,在试验范围条件下的底板块尺寸,最大径向相对位移小于底板块厚度的70%时,满足抗压强度要求。

A fine hydraulic inverted plunge pool model under high water head and large flow discharge is established using shock jet flow theory and gravity similar rules as well as satisfying the similar terms of the turbulent resistance. Experimental research on variational rule of force at arch spandrels of arch invert plunge pool is carried out on the condition that water seal is damaged and anchor-hold is out of action. The investigated result indicates that the force arrives maximum at the location of 0.1 m upward and downward impact drop and then deminishes along water flow and its value can increase along with slab number. The maximum compressive resistance was obtained through its transformation. The maximum radical displacement less than 70% of the thickness of bottom slab in the case of testing range of bottom slab size can satisfy the demand of compressive resistance.