常见护坡草本植物对边坡稳定性的影响  

Effects of common slope protection herbs on slope stability

作　　者：吕嫒嫒 LV Yuan-yuan(Hangzhou Transportation Investment Construction Management Group Co.,LTD.,Hangzhou 310024,China)

机构地区：[1]杭州交通投资建设管理集团有限公司,浙江杭州310024

出　　处：《地基处理》2021年第3期181-187,共7页Journal of Ground Improvement

基　　金：浙江省交通运输厅科研计划项目(2019035)。

摘　　要：近年来,高速公路边坡失稳导致的滑坡、崩塌等事故频发,植物根系在提高边坡稳定性、防止坡面侵蚀等方面效果显著。为了准确评价植物根系的加固效果,本文以千黄高速路基边坡项目为依托,通过室内植物试验获得水淹胁迫下不同植物萌发率、叶绿素含量、SOD活性、丙二醛含量以及脯氨酸含量的变化规律,综合分析得到7种植物的耐淹性大小依次为:百喜草>香根草>狗牙根>结缕草>高羊茅>黑麦草>果岭草。进一步采用数值模拟方法将土体和植物根系简化为根土复合体,分析在降雨条件下植物根系的分布密度、根须数量以及植物种类对边坡表层土体稳定性的影响。结果表明:边坡土体水平位移量、竖向位移量、总位移量随着护坡植物须根数量的增多和分布密度的增大而逐渐减小,植物根系的存在能有效提高边坡表层土体整体稳定性,防止浅层滑坡。In recent years,landslides,collapses and other accidents caused by highway slope instability are common.On one hand,plant roots have remarkable effects on improving slope stability and preventing slope erosion at shallower depths.In order to accurately evaluate the reinforcement effect of plant roots,based on the subgrade slope in Qiaohuang expressway project,the changes of plant germination rate,chlorophyll content,SOD activity,malondialdehyde content and proline content of different plants under submergence stress are obtained through indoor plant experiments.The results showed that the order of submergence tolerance of 7 plants is as follows:Paspalum natatum>Vetiver grass>Bermuda grass>Zoysia japonica>Festuca arundinacea>Ryegrass>Green grass.Thus,the above results provide the basis for the selection of protection plants vetiver under rainfall condition.Furthermore,in this study,the soil and plant roots are simplified into root-soil complex by numerical simulation method,and the effects of the distribution density of plant roots,the number of root hairs and the plant species on the stability of slope surface soil under rainfall conditions were analyzed.The numerical simulation results showed that the horizontal displacement,vertical displacement and total displacement of slope soil gradually decrease with the increase of the number and distribution density of plant roots.Hence,the existence of plant roots can effectively improve the overall stability of slope surface soil and prevent shallow landslides.

关 键 词：公路护坡 有限元分析法 稳定性 位移 降雨 

分 类 号：TU42[建筑科学—岩土工程]