深浅根混种法加固边坡稳定性的数值分析  

Numerical analysis on stability of slope reinforced by combination of deep and shallow roots

作　　者：杨文辉 章定文[1] 闫茜 毛忠良 Yang Wenhui;Zhang Dingwen;Yan Qian;Mao Zhongliang(School of Transportation,Southeast University,Nanjing 211189,China;Geological Roadbed Survey and Design Department,China Railway Fifth Survey and Design Institute Group Co.,Ltd.,Beijing 102600,China)

机构地区：[1]东南大学交通学院,南京211189 [2]中铁第五勘察设计院地质路基勘察设计处,北京102600

出　　处：《东南大学学报（自然科学版）》2020年第1期161-168,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家重点研发计划资助项目(2016YFC0800200)

摘　　要：为了研究深浅根混种法对路基边坡稳定性的影响效果,统计了含根土体抗剪强度增强特性,利用数值模拟对比了不同护坡方式的加固效果,并对浅根加筋和深根锚固作用进行了参数分析.统计结果表明,黏聚力为15 kPa的边坡土体加入植物根系后,黏聚力最大提升15~20 kPa.数值分析结果表明:深浅根植物单独护坡作用有限,而配合土工格栅的深浅根混种法能有效提高边坡稳定性,安全系数最大提高8%;浅根植物加筋作用能提高边坡表层土强度及整体性,最适宜加筋深度为60 cm左右;深根植物主根穿过塑性区后能有效发挥锚固作用,且边坡稳定性随深根生长而提高;深根植物种于坡脚时固坡效果最明显,且宜采取坡下密坡上疏方式种植.To study the effects of combination of deep and shallow roots on the stability of subgrade slope, the shear strength enhancement characteristics of the root soil were summarized. The reinforcement effects of different slope protection methods were compared by using the numerical simulation method, and the effects of the parameters of shallow root reinforcement and deep root anchorage were analyzed. The statistical results show that the cohesion of the slope soil with 15 kPa can be increased by 15 to 20 kPa when plant roots are added to the soil. The results of numerical analysis show that the slope protection effect of individual planting of shallow root plants or deep root plants is limited, while the combination of deep and shallow roots with geogrid can effectively improve the slope stability, and the safety factor can be increased by 8%. The reinforcement of shallow roots can improve the strength and integrity of the surface soil of the slope, and the optimum reinforcement depth is about 60 cm. The deep root plants can anchor slope after the main root passes through the plastic zone, and the slope stability increases with the growth of the deep root. The reinforcement effect of the deep root plant in the foot of the slope is the most obvious, and the planting mode of dense under the slope and sparse on the slope should be adopted.

关 键 词：边坡稳定性 生态护坡 锚固效应 加筋效应 数值模拟 

分 类 号：U417.2[交通运输工程—道路与铁道工程]