摘要
丁坝和护坦是沿河公路冲刷防护的常用型式,其防护特点有所不同,二者合理的配合使用,能够使防护效果更好,同时节省投资。运用理论分析和模型试验相结合的方法,对丁坝和护坦不同配合形式下的河弯凹岸冲刷防护效果进行了对比分析,指出护坦顶面应低于河床面,其减冲防护效果与护坦宽度bH有关。当护坦宽度bH较小时,护坦与潜坝合理的配合形式是:当坝长大于护坦宽度时,从上游坝开始,各坝的坝顶高程应逐个降低,直至与护坦顶面高程相等;当坝长等于护坦宽度时,各坝坝高应高于护坦顶面,且均与河床面等高。当护坦宽度bH较大时,与潜坝配合,防护效果无明显增加。
Spurdike and apron are common structures for scour protection of subgrade by river side and are different in protection features somewhat to them, the protection and economic benefits would be more efficacious in the case of the combination of spurdike and apron rationally.The protection effect of the combination in bend channel under different conditions was comparative analyzed based on theory analysis and model test.It was pointed out that the top of apron should be lower than bed and the protection effect is relate to apron width bH if bH is smaller,the rational combination way is that the top of spurdikes should be lower one by one from first one until equal the top of apron when the spurdike length is larger than apron width. The top of spurdikes should be higher than the top of apron and equal height of bed while the spurdike length equals apron width.If bH is lager relatively, the protection effect is not increased obviously while the apron is combined with spurdike.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2003年第5期32-36,共5页
Journal of Chang’an University(Natural Science Edition)
关键词
丁坝
护坦
沿河公路
冲刷防护
防护效果
配合使用
road engineering
subgrade river side
scour protection
apron
spur-dikes
combination
