Abstract: Spur-dike is a common structure for scour protection of subgrade river side, and spur-dikes are applied usually.The length and separate distance of spur-dikes are important design parameters. The flow pattern and scour law around spur-dikes in the straight and bend channel are studied based on theory analysis and model test, put forward the method to arrange spur-dikes controlled by protection region and scour depth, point out that the 1# spur-dike which is shorter and of half length of others is suitable, and others are same in length. In bend chnnel, the separate distance of spur-dikes should be shorter due to flow pattern and scour law are more complicated, but the method for the straight channel can be consulted to determine separate distance of spur-dikes.The difference between river and model channel are already considered in the method.

Key words: subgrade river side, spur- dikes, scour depth, protection region, separate distance

摘要： 丁坝是山区沿河路基常用的冲刷防护构造物,而且以群坝防护形式居多.群坝防护时,坝长和坝间距是重要 的设计参数.通过理论分析和模型试验,对顺直河段和弯曲河段中丁坝群的水流形态、冲刷规律进行分析研究,并 以防护长度和冲刷深度作为控制指标,提出了沿顺直河段和河弯凹岸布设丁坝群的计算方法,指出群坝中的1# 坝应该比较短,其它各坝坝长可以相同,1#坝坝长为其它各坝坝长的一半比较适宜.在弯道中,水流形态,冲刷特 点更为复杂,群坝的间距应该更小,但仍然可以根据直道中的计算方法确定坝间距.建立群坝间距计算方法时,已 考虑到天然河段与室内水槽模型差异.

关键词: 沿河公路, 丁坝群, 冲刷深度, 回流区长度, 丁坝间距