不同类型植被根系对边坡表层的加固效果研究

Numerical investigation of slope stability reinforced by vegetation

植被根系固坡技术已经在边坡防护工程,尤其边坡表层防护得到广泛应用,但是目前关于植被固坡的理论研究却滞后于工程实践的应用.为了对不同类型植被固坡效果有更加清晰的认识,本文在建立不同类型植被(草地、灌木、成长树木、成熟树木)根系附加力学权重表的基础上,采用数值模拟手段对不同植被的在不同边坡尺寸和坡度下根系固坡效果进行分析和探讨.结果表明:成熟树木由于根系较深且表层附加力较大,在同等条件下,斜坡的安全系数最大、成长树木和灌木次之、草地的安全系数最小;此外,随着边坡角度和边坡基本尺寸的增大,4种植被的斜坡安全系数均呈现降低的趋势.

Vegetation revetment,as a useful technique,has been applied to slope engineering,especially in shallow slopes.However,the analysis of theory regarding vegetation revetment left behind the corresponding engineering practices.In order to alleviate it,this study first establishes weight table of root additional cohesion system based on current theories to analysis different types of vegetation(grass,shrubs,young forest,mature forest)’s additional cohesion with different depth of soil,and numerical method is adopted to analysis the reinforcement effect of different types of vegetation and different slope geometry parameters.The results show under same condition,the reinforcement effect of mature forest is best,second is young forest,third and fourth are shrubs and grass;with the increase of slope angle and slope length,the reinforcement effect of four types of vegetation are both showing a decrease trend.