沿河路基冲刷的综合防护效果

Comprehensive protection effect to erosion of subgrade along river

为了研究山区公路沿河湾凹岸路基冲刷采用丁坝和护坦配合使用的综合防护效果,通过室内水工模型试验,模拟丁坝群和护坦配合使用对凹岸路基的冲刷防护;根据试验结果对防护效果进行对比分析,并结合试验工程进行了验证。结果表明:当单独使用丁坝或护坦不能达到满意的防护效果时,可以采用丁坝与护坦合理配合的防护形式,使防护效果和经济性更好;当护坦宽度较小时,潜坝坝长可大于护坦宽度,且从上游坝开始,各坝的坝顶高程应逐个降低,直至与护坦顶面高程相等;当护坦宽度较大时,单独采用护坦防护已经能够达到防护要求。

This paper is aimed to the erosion of concave bank along river for subgrade of moun tainous highway, and the comprehensive protective effect of using spur dike cooperatively with apron based on indoor hydraulic model tests, theoretical analysis and verification of experimental project. It is found that： when it cannot reach the satisfied protection effect by the single use of spur dike or apron, a reasonable protection form of using spur dike cooperatively with apron can be adopted, these can make the protection effect and economy better; if the apron width is rather small, and the submerged dike length is greater than apron width, the top elevation of the spur dikes should be decreased one by one until equaling the top elevation of apron from the beginning of the upstream submerged dike; while apron width is quite large, protection effect of the apron is obvious. 1 tab, 4 figs, 13 refs.