蒿属植物黄土边坡固土效应数值研究  

Numerical Study on Soil Reinforcement Mechanism Combined with Artemisia in Loess Slope Protection

作　　者：李寻昌[1] 李平安 许锐[1] 杨威[1] 侯慧颖 Li Xunchang;Li Ping'an;Xu Rui;Yang Wei;Hou Huiying(School of Geology Engineering and Geomatics,Chang'an University,Xi'an 710054,China)

机构地区：[1]长安大学地质工程与测绘工程学院,陕西西安710054

出　　处：《甘肃科学学报》2022年第1期95-99,共5页Journal of Gansu Sciences

基　　金：长安大学中央高校基本科研业务费专项资金项目(310826171013,310826172203);陕西省大学生创新创业训练计划项目(S202010710420,S202010710433)。

摘　　要：黄土高原生态环境脆弱,大量裸露边坡造成日益严重的水土流失与地质灾害问题。植物护坡是恢复黄土边坡生态和防治黄土边坡地质灾害的有效手段。文章基于延安地区黄土边坡调查,筛选出适宜当地环境且护坡效果明显的蒿属植物作为研究对象;通过土工试验,得到根-土复合体的力学参数;最后利用FLAC3D软件对不同坡度与不同根系状态下的边坡进行数值模拟,通过强度折减法求得安全系数,比较分析其护坡效应。结果表明:(1)植物根系能够提高土体的力学参数,从而提高边坡的稳定性;(2)植物根系对边坡稳定性的提高效果随着坡度增大而增大;(3)蒿属植物在西北黄土地区生态复合型防治技术方面具有极大的应用潜力。Due to the fragile ecological environment and the influence of human engineering activities,the soil erosion and loess slope geological disasters have been increasing on the Loess Plateau.The loess slope protection by vegetation is the effective means for restoration ecology and geological disaster prevention.In this paper,Artemisia is taken as the research object by field investigation;and then the influence of roots on physical and mechanical parameters of soil will be analyzed by laboratory soil test.On this basis,the finite difference model of root-soil composite system was established by FLAC3D software.By contrasting the numerical modeling results,the influence law of slope protection effect affected by different factors is analyzed.The results show that:(1)roots can improve the mechanical parameters of soil,thereby improved the stability of the slope;(2)effect of improving slope stability is better when slope gradient is increasing;(3)loess slope ecological protection technology combined with Artemisia and traditional engineering measures has great potential for application in northwest China.

关 键 词：黄土边坡 蒿属植物 根-土复合体 有限差分法 护坡效应 

分 类 号：TU434[建筑科学—岩土工程]