摘要
为研究降雨作用下草本护坡植物对河岸边坡稳定性的影响,试验测定了黄河古河道草本植物发育土体的土水特性指标,试验结果表明：狗牙根-土、高羊茅根-土、香根草根-土相比裸地黏聚力分别增长52%、140%、222%;根-土复合体在土水特征曲线中进气值提高,持水性增强;在相同饱和度下,根-土复合体渗透系数比裸地高1-2个数量级。有限元数值模拟结果说明,在降雨作用下,草本植物护坡效应主要表现增强边坡浅层稳定及约束边坡变形,对边坡最大位移的减幅从高到低依次为香根草〉高羊茅＆gt;狗牙根,并且草本植物约束边坡变形的能力在降雨条件下被削弱。研究成果可作为黄河古河道生态护坡工程优选草本植物,防治岸坡浅层失稳的依据之一。
To study the effects of herbs on the stability of river bank slopes under rainfall, experiments have been conducted to determine the properties of vegetated soil in the Yellow River Old Riverway. The results show that the increments of the cohesion force of the 3 herbs rootsoil composite systems are 52% （Bermuda grass）, 140% （Tall Feseue） and 222% （Vetiver grass）, respectively, compared with that of unvegetated soil. The soil-water curve indicates that the air-entry value of root-soil composite system is increased and its water retention capability is improved. In addition, their permeability coefficient are 1 - 2 orders of magnitude higher than bare land under the same saturation. Numerical simulation shows that herbs play an important role in stabilizing the surface soil of slopes and confining the slope deformation. The descending order of reducing the slope maximum displacement is Vetiver grass 〉 Tall Fescue 〉 Bermuda grass. The ability of herbs to confine the slope deformation can be weakened under rainfall condition. The achievements can be taken as criteria for choosing herbs for protecting slopes and preventing shallow landslide in the Yellow River Old Riverway area.
作者
张伟伟
吴玉柏
纪建中
陈达
金秋
黄明逸
ZHANG Wei-wei WU Yu-bai JI Jian-zhong CHEN Da JIN Qiu HUANG Ming-yi(College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China Jiangsu Research Institute of Water Conservation, Nanjing 210017, China Huai＇an City Water Conservancy Survey Design Institute Co., Ltd., Huai＇an 223001 ,Jiangsu Province, China College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)
出处
《中国农村水利水电》
北大核心
2016年第11期151-155,159,共6页
China Rural Water and Hydropower
基金
水利部公益性行业科研专项经费项目(201101054)
江苏省水利科技重点项目(201402)
江苏省普通高校研究生实践创新计划项目(SJLX15_0199)
关键词
生态护坡
降雨
非饱和土
草本植物
黄河古河道
ecological slope protection
rainfall infiltration
unsaturated soil
herbs
Old Riverway of Yellow River
