坡面截洪渠设计流量及断面优化分析

Analysis on Design Flow and Section Optimization of Flood Channel on Slope

广州某规划区位于山体南部坡脚,由于山坡坡面长,地势陡,雨水汇流迅速,为防止山洪危害,需在规划区北部红线附近修建截洪渠。由于拟建工程处于山坡脚斜坡上,与一般平整场地修筑渠道有所不同,在设计过程中遇到了一系列的问题,特别是在流量估算和渠道断面安全设计方面。通过对截洪渠汇水分析计算、渠道坡度、平面布置、断面形状、断面开挖、上/下坡侧挡墙型式等方面不断优化得到了相对合理的坡面截洪渠标准断面设计型式,提出了多个截洪渠设计中需要注意的事项与建议,对同类工程的设计具有一定的指导意义。

A planed district of Guangzhou is located at the foot of southern slope of the mountain.It is required to build the flood channel near the red line at the north of the planned district to prevent the mountain flood because of long slope,steep terrain and quick rainwater flow.A series of problems,especially in the flow estimation and the channel section safety design,are met in the course of design for the project to be constructed at the slope of mountain foot,which is different from the general leveling site to build the channel.The article analyzes and calculates the catchment of flood channel,and continuously optimizes the channel gradient,plane layout,sectional shape,sectional excavation and upper/lower slope side retaining wall types to get the relatively reasonable typical sectional design mode of slope flood channel,and puts forward cautions and suggestions for the design of many flood channels,which have a certain guiding meanings for the design of the same projects.