【摘要】 通过水工模型试验,研究了台阶式泄水建筑物在3种坡度下平底消力池底板上的时均压强及其形成的特点。结果表明,时均压强最大值出现在水流冲击消力池底板处,位于xo/h=-0.17～1.8之间,压强水头的比值yp/hk最大可达5.4,其压强随泄槽坡度和流量的增加以及台阶高度的减小而增大;时均压强最小值出现在水流冲击处下游,位于xi/lj=0.09～0.58之间,以远驱水跃时压强最小,其值接近零,偶尔会出现很小的负值。更多还原

【Abstract】 Via the hydraulic structure model tests,this paper deals with the stilling basin floor’s mean pressure of stepped spillways and its characteristics formed in 3 kinds of gradients.The result shows that the maximum value of mean pressure appears at the place where water flow strikes the stilling basin floor,somewhere between xo/h=-0.17～1.8,and that the maximum ratio of the pressure head yp/hk can reach 5.4,whose pressure increases along with the increment of chute gradient and discharge and lowering of the step height;the minimum value of mean pressure appears at the downstream where the water flow impacts,somewhere between xi/lj=0.09～0.58,the pressure gets to its lowest when repelled downstream hydraulic jump happens,and the value is close to zero while occasionally extremely small negative values can emerge.更多还原