跌坎式底流消能工跌坎深度确定及工程应用

Determination of falling-sill depth for bottom-flow energy dissipator with sill and its engineering application

由于受地形条件和下游高速公路桥墩的限制,某水库工程在选择消能工和体型的布置上难度较大,最终设计采用底流消能。为研究消力池的体型、消能效果和出池水流对高速公路桥墩的影响,开展了水力学模型试验。采用降低消力池底板高程形成跌坎式底流消能工,取得了良好的消能效果,临底流速降低明显,下游河道水流对高速公路桥墩的水力冲击明显减弱。所得成果可为类似工程的消能研究提供参考。

Due to the limitations from both the topographic condition and the bridge piers of a downstream highway,it is quite difficult to select the layout of the energy dissipator and its shape for a reservoir project,for which the bottom-flow energy dissipator is adopted in the final design. In order to study the impacts from the shape of the dissipator,the disspation effect and the outflow from stilling pool on the highway piers,a hydraulic model test is carried out. A better dissipation effect is obtained with the bottom-flow energy dissipator with falling-sill formed by lowering the the elevation of the bottom floor,and then the underflow is obviously lowered and the the hydraulic impact from the downsream river channel on the highway piers is significantly weakened as well. The result obtained herein can provide references for the similar project concerned.