Based on the anti-scour protection principle of pier foundation,a new anti-scour structure with high stability,the diversion body,is designed.In order to explore the anti-scour effect of diversion body on lo-cal scour of cylindrical pier,a series of physical model tests is carried out with different shapes of diversion body under different flow rates and covering conditions,and the optimal shape and installation position are se-lected by analyzing scour characteristics,maximum scour depth,hydraulic characteristics of the underlying flow,scour hole volume and scour hole surface area.The test results show that:when the base height of the diversion body is 8 cm and the installation position is 2d,the anti-impact effect is the best.As the flow veloci-ty is 0.32 m/s,the maximum impact depth,impact volume and impact surface area of the scour hole around the pier can be reduced by 59.3％,76.1％and 79.0％,respectively,compared with unprotected,and the turbulence intensity of the underlying flow can be significantly reduced.It is also found that the installation distance is the main factor affecting the anti-scour effect by the sensitivity analysis.
关键词
导流体/最大冲坑深度/冲坑体积/冲坑面积/下潜流水力特性/敏感性分析
Key words
diversion body/maximum depth of scour hole/scour hole volume/scour hole area/hydraulic char-acteristics of underlying flow/sensitivity analysis
维普
万方数据