强降雨作用下生态袋护坡入渗规律模型试验研究  

Model Test on Infiltration Law of Ecological Bag Slope Protection under Heavy Rainfall

作　　者：蒋希雁[1,2,3,4] 陈宇宏 许梦然 张喆 王万梅 JIANG Xi-yan;CHEN Yu-hong;XU Meng-ran;ZHANG Zhe;WANG Wan-mei(Hebei University of Architecture,Zhangjiakou 075031,Hebei Province,China;Hebei Key Laboratory for Diagnosis,Reconstruction and Anti-disaster of Civil Engineering,Zhangjiakou 075031,Hebei Province,China;Hebei Innovation Center of Transportation Infrastructure in Cold Region,Zhangjiakou 075031,Hebei Province,China;Zhangjiakou Geotechnical Engineering Technology Innovation Center,Zhangjiakou 075031,Hebei Province,China)

机构地区：[1]河北建筑工程学院,河北张家口075031 [2]河北省土木工程诊断、改造与抗灾重点实验室,河北张家口075031 [3]河北省寒冷地区交通基础设施工程技术创新中心,河北张家口075031 [4]张家口市岩土工程技术创新中心,河北张家口075031

出　　处：《中国农村水利水电》2022年第7期1-9,共9页China Rural Water and Hydropower

基　　金：河北省高等学校科学技术研究重点项目(ZD2019111);张家口市科技计划财政资助经费项目(1811009B-08);河北建筑工程学院研究生创新基金项目(XY202103)。

摘　　要：为研究强降雨下使用生态袋支护边坡中植物的防护作用,在两种坡度下的强降雨边坡模型试验中分别设置有植被生态袋支护与无植被生态袋支护,测量强降雨过程中边坡不同位置(坡面,坡顶,坡底)的体积含水量变化与孔隙水压力分布,分析不同条件的强降雨作用下生态袋护坡的入渗规律。试验结果表明:①无植被生态袋支护不同位置的入渗速率排布为:坡面>坡顶>坡底。有植被生态袋支护不同位置入渗速率大都相近,并且整体速率快于同条件下的无植被生态袋支护。②有植被生态袋支护的体积含水量突变速率因根茎-土交界面流动带来更多入渗土体的雨水而变得更快。③有植被生态袋支护孔隙水压力整体提升速率因坡面较慢发展的暂态饱和区而变慢,孔隙水发展慢会有利于边坡的稳定,但此效果在坡比较高边坡并不明显。④结合实际工程与本次试验结果可以确定一个适用生态袋支护的坡度值范围,并提出生态袋支护下边坡受降雨危害的一些预警方法。研究结论对于使用生态袋的强降雨条件下边坡治理维护具有重要的理论指导价值与实际意义。In order to study the protective effect of plant in slope ecological bag support under heavy rainfall,this paper sets vegetation eco⁃logical bag support and non-vegetation ecological bag support respectively in two kinds of slopes under heavy rainfall in the model test.The volumetric water content and pore water pressure distribution at different positions of slopes(slope surface,slope top and slope bottom)during heavy rainfall are measured.The infiltration law of ecological bag slope protection under different conditions of heavy rainfall is analyzed.The results show that:①In the case of ecological bag support without vegetation,the distribution of infiltration rates at different positions is slope surface>top of slope>bottom of slope.In the case of ecological bag support with vegetation,the infiltration rates at different positions are almost the same.And the overall rate is faster than that of ecological bag support without vegetation under the same conditions.②The abrupt change rate of volumetric water content supported by ecological bags of vegetation becomes faster because the flow at the root-soil interface brings more rain water into the soil.③The overall increase rate of pore water pressure in the support of ecological bags with vegetation is slow due to the slow development of the transient saturated zone on the slope.The slow development of pore water is conducive to the stability of the slope.However,this effect is not obvious in higher slopes.The above conclusions have an important theoretical guiding value and practical significance for slope treatment and maintenance under heavy rainfall conditions with ecological bags.④Combined with the actual project and test results,a slope value range suitable for ecological bag support can be determined,and a rainfall hazard warning method for slopes under ecological bag support is proposed.

关 键 词：强降雨边坡 生态袋 模型试验 入渗规律 

分 类 号：TU411.7[建筑科学—岩土工程]