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考虑倾角的土质边坡分层假定入渗模型研究
雷文凯1, 董宏源1, 陈攀1, 吕海波1,2, 梅国雄1
1.广西大学;2.贺州学院
摘要:
针对传统Green-Ampt入渗模型忽略了坡角和土体非饱和区对边坡降雨入渗的影响这一情况,利用倾角对土体入渗势能梯度进行修正,并将入渗时边坡土体的含水率划分为饱和层、过渡层、未湿润层三个部分,建立考虑倾角的土质边坡分层假定入渗模型,推导边坡降雨入渗深度与降雨历时的关系,并通过入渗实例将新模型与传统GA模型进行比较。研究结果表明,分层假定模型预测的湿润锋深度与降雨历时的关系及坡面产流时间较传统GA模型更接近实测值;自由入渗阶段,分层假定模型的湿润锋扩展深度与GA模型一致,但入渗速率低于GA模型;积水入渗阶段,分层假定模型的湿润锋扩展深度及入渗速率均较GA模型高,湿润锋扩展深度的差值随着降雨历时的增大逐渐增大,而入渗速率差值的变化呈相反趋势。根据新模型,分析了倾角和雨强对边坡降雨入渗的影响情况,发现,随着边坡倾角的增大或雨强的减小,雨水入渗到坡体内相同深度所需的降雨历时增加,这种现象在倾角大于60°或雨强小于20mm/h时尤为明显。新模型对快速分析土质边坡降雨入渗的影响因素有参考意义。
关键词:  倾角  土质边坡  分层假定  入渗模型
DOI:
分类号:
基金项目:国家自然科学基金项目(41672296),广西自然科学基金创新研究团队项目(2016GXNSFGA380008),广西研究生教育创新计划资助项目(YCSW2019046)
Stratified assumption infiltration model of soil slope considering inclination
Lei Wenkai1, Dong Hongyuan1, Chen Pan1, Lv Haibo1,2, Mei Guoxiong1
1.Guangxi University;2.Hezhou University
Abstract:
In view of the fact that the traditional Green-Ampt infiltration model ignores the influence of slope angle and unsaturated zone of soil on the rainfall infiltration of slope, the gradient of infiltration potential energy of soil was modified by using the slope angle, and the soil was divided into saturated layer, transition layer and non humid layer during infiltration. Then a new model based on stratified assumption considering inclination was established. The relationship between infiltration depth and rainfall duration was ascertained and the new model was compared with the traditional GA model through an infiltration example. The results show that the surface runoff initiation time and the relationship between wetting front depth and rainfall duration predicted by the new model is closer to the measured value than that by the GA model. In the stage of free infiltration, the wetting front depth of the new model is the same as that of GA model, but the infiltration rate of the new model is lower than that of GA model. In the stage of ponding infiltration, the wetting front depth and infiltration rate of the new model are higher than that of GA model, and the difference of wetting front depth increases gradually with the increase of rainfall duration, while the change of difference between infiltration rates shows the opposite trend. According to the new model, the influence of slope inclination and rainfall intensity on rainfall infiltration is analyzed. It is found that the rainfall duration required for rainwater infiltration into the same depth of slope increases with the increasing slope inclination or the decreasing rainfall intensity, which is especially obvious when the inclination is more than 60° or the rain intensity is less than 20 mm/h. The new model is useful for the rapid analysis of the factors affecting rainfall infiltration of soil slope.
Key words:  slope angle  soil slope  stratified assumption  infiltration model
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