降雨条件下植被根系对非饱和土浅层滑坡的加固作用

Impact of Vegetation Root Reinforcement on the Shallow Slope Stability of Unsaturated Soil Under Rainfall Infiltration Conditions

为了研究降雨条件下植被根系对非饱和土边坡浅层滑移的稳定性,基于可计算任意时刻任意土层深度处孔隙水压力分布与变化特征的降雨入渗解析模型,通过理论解析方法研究降雨入渗作用、植被根系抗拉强度、根面积指数以及根系生长方向等因素对边坡浅层滑移稳定性的影响。结果表明,植被根系的抗拉强度越大或根面积指数越大,则边坡的稳定性越强。随着边坡坡角的增大,植被根系对边坡稳定性的加固效应越加明显。此外,植被根系的生长方向也会对加固效果产生明显影响。在实际工程中,应在合理控制植被根系生长方向的基础上,选择根系发达且发育较长同时具有较大根面积指数的植被,以达到更好的护坡效果。

To investigate the stability of unsaturated soil slopes under rainfall conditions with vegetation roots,this study is based on a rainfall infiltration analytical model that can calculate the distribution and variation of pore water pressure at any depth of the soil layer at any time.Through theoretical analysis,the effects of rainfall infiltration,tensile strength of vegetation roots,root area ratio,and growth direction of roots on the stability of shallow slope sliding were studied.The results indicate that the greater the tensile strength of the plant roots or the larger the root area ratio,the stronger the slope stability.Meanwhile,as the slope angle increased,the reinforcing effect of vegetation on the slope stability becomes more apparent.In addition,the growth direction of vegetation roots also has a significant impact on the reinforcement effect.In practical engineering,it is recommended to select vegetation with well-developed roots,longer growth,and a larger root area ratio while controlling the growth direction of vegetation roots to achieve a better slope protection effect.