银武高速公路同心至固原段边坡面蚀试验分析

Statistical Analysis of Surface Erosion Testing of Yinwu Highway Slopes from Tongxin to Guyuan

为研究高速公路边坡面蚀,选择银武高速公路同心至固原段固原立交2.5 km范围作为研究区段,根据不同公路边坡类型和防治措施设置6个观测小区,采用插钎法测定坡面的面蚀量,同时由虹吸式自记雨量计记录降雨量。分别测定和计算了降雨量、降雨历时、平均降雨强度、前期降雨量4个因子。分析结果表明,降雨对坡面面蚀的制约关系十分明显。影响面蚀量的主要降雨因子是降雨量和平均降雨强度,面蚀量与降雨量和平均降雨强度呈现极显著和显著的正相关关系,面蚀量与降雨因子中的前期降雨量呈现一定的负相关关系。采用强迫引入法,建立了面蚀量与降雨因子主成分的回归方程。

To study the surface erosion of highway slopes, Guyuan interchange in 2.5 km was selected as an experiment site. According to the different slope types and preventive measures, six experimental plots were set. Surface erosion of different slopes was measured by poker bar method. The process of rainfall was recorded by siphon recording rain gauge. The four factors of rainfall, including rainfall amount, rainfall duration, rainfall intensity, ante-precipitation were measured. The results showed that the influence of rainfall on surface erosion was obvious. The decisive factors of effecting surface erosion were rainfall amount and rainfall intensity. The correlativity between amount of surface erosion and rainfall amount, rainfall intensity was obviously remarkable and remarkable. The correlativity between amount of surface erosion and ante-precipitation was contrarily remarkable. Valid regression equations were formulated between the surface erosion amount and principal component of factors of rainfall by Enter method.