影响植物根系加固路基边坡土体效果的试验研究  

Experimental Study on the Effect of Plant Roots on Strengthening Subgrade Slope Soil

作　　者：刘焰 严秋荣 南林 李广俊 LIU Yan;YAN Qiurong;NAN Lin;LI Guangjun(China Merchants Chongqing Highway Engineering Testing Center Co.,Ltd.,Chongqing 400067;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074)

机构地区：[1]招商局重庆公路工程检测中心有限公司,重庆400067 [2]重庆交大建设工程质量检测中心有限公司,重庆400074

出　　处：《公路交通技术》2023年第2期21-26,共6页Technology of Highway and Transport

摘　　要：利用植物根系加固公路路基边坡土体是一种新型的路基防护加固形式,不仅有益于绿色环保和美化行车视觉,还可以提高公路路基边坡的稳定性。在路基边坡植物根系稳定土体中,根系的位置、长度以及路基边坡土的含石率均会对其固土效果产生影响,采用大型直剪试验仪对含有根系的土体进行剪切试验,通过调整根系与剪切方向的距离、根系材料的倾斜角度、土的含石率,研究根系对土体抗剪强度的影响及根系边坡土体的稳定性。结果表明,根系可大幅提高土的抗剪强度,同时随着土中含石率的增加,根系的改善作用更加明显。Using plant roots to reinforce the soil of highway subgrade slopes is a new form of roadbed protection and reinforcement,which is not only beneficial for green environmental protection and beautification of driving vision,but also can improve the stability of highway subgrade slopes.In the stable soil of plant roots on the subgrade slope,the position and length of the plant roots,as well as the stone content of the subgrade slope soil,will have an impact on its soil fixation effect,Shear tests were carried out on soil with roots by using large-scale direct shear test apparatus.The effects of roots on shear strength of soil and stability of subgrade slope of plant roots were studied by adjusting the distance between roots and shear direction,the inclination angle of root material and the content of gravel in fine grained soil.The results show that the plant roots can greatly improve the shear strength of soil,while for coarse-grained soil,the improvement of root system becomes more obvious with the increase of gravel.

关 键 词：道路边坡 固土效果 剪切试验 根系模拟材料 

分 类 号：U418.52[交通运输工程—道路与铁道工程]