降雨条件下沿阶草加固边坡机理及坡体稳定性分析  

Slope Reinforcement Mechanism and Stability Analysis of Ophiopogon bodinieri Under Rainfall Conditions

作　　者：郭建军[1,2] 张伟 曹衡[1] 武臻维 GUO Jianjun;ZHANG Wei;CAO Heng;WU Zhenwei(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074

出　　处：《人民珠江》2025年第4期9-15,共7页Pearl River

基　　金：重庆市水利科技项目(CQSLK-2023029);重庆市自然科学基金项目(CSTB2022 NSCQ-MSX0991)。

摘　　要：为探究沿阶草对土体的加固作用,阐述了沿阶草对边坡表层土体的加固作用机理;分析了沿阶草根系对土体的挤密作用;提出了土体抗剪强度提高值的计算方法。基于ABAQUS有限元软件,针对裸土边坡、沿阶草根系加固边坡两种工况,分别施加0、10、15、20 mm/h四种不同的降雨强度,对不同降雨条件下的坡表土体位移和边坡安全系数进行分析。结果表明:沿阶草通过根系和末端纺锤状块体产生的挤压作用和锚固作用,增强了表层土体的整体性,增加了土体的密实度;降雨时沿阶草根系能有效限制坡表位移,使向坡顶后方转移,且随着降雨量增大,位移限制效果更加明显;同时沿阶草根系能提高边坡的安全系数,降雨量增大时,增幅有所降低。沿阶草的固土护坡作用明显,是一种优秀的护坡植物,在强降雨时可用于三维植被网护坡技术。To explore the reinforcement effect of Ophiopogon bodinieri on soil,the reinforcement mechanism of O.bodinieri on the surface soil of the slope was expounded.The compaction effect of the roots of O.bodinieri on the soil was analyzed.A calculation method for increasing the shear strength of soil has been proposed.Based on ABAQUS,four different rainfall intensities of 0,10,15,and 20 mm/h were applied to the bare soil slope and the slope was reinforced by the roots.The displacement of slope surface soil and the security coefficient of slope under different rainfall conditions were analyzed.According to the results,O.bodinieri enhances the integrity of the surface soil and increases the compactness of the soil with the extrusion and anchoring effects of the roots and the spindle-shaped blocks at the end.During rainfall,the root system of O.bodinieri can effectively limit the displacement of the slope surface,so that the large displacement area is transferred to the rear of the slope top.With the increase in rainfall,the displacement limitation effect is more obvious.At the same time,the root system of O.bodinieri can also improve the security coefficient of the slope.As the rainfall gets larger,the increase gets slower.With a significant reinforcement effect on soil slopes,O.bodinieri is an excellent slope protection plant and can be used for three-dimensional vegetation network slope protection technology during heavy rainfall.

关 键 词：植物护坡 沿阶草 降雨 坡表位移 

分 类 号：TV697.23[水利工程—水利水电工程]