木本植物根系对边坡稳定性影响分析

Analysis of the slope stability reinforced by roots of woody plants

根据木本植物根系对边坡提供轴向力和抗剪力的原理,采用不同根系长度下的抗拔力的取值,建立根系固坡模型并进行数值模拟分析。在模拟过程中,针对根系长度、密度和降雨条件等主要影响因素,研究其对边坡稳定性的影响。结果表明:木本植物根系的存在能够提高土体的抗剪强度,增加边坡的稳定性,使边坡更加趋于稳定;木本植物根系长度的增加和密度的变大,都会增大边坡的安全系数;在降雨条件下,植物根系仍能增大边坡的安全系数,对边坡有一定的加固效果。

The model of slope reinforced by roots is established and the numerical simulation is carriedout by using the pullout resistance of different roots length according to the principle of the axial forceand the shear resistance of the woody roots system to the slope.In the process of simulation,the effectsof the roots length,roots density and rainfall conditions on the slope stability are studied.The resultsshow that the roots of woody plants can improve the shear strength of soil,increase the stability of slopeand make the slope more stable.Increasing the length and density of woody plants can make the safetyfactor of slope larger.The roots system can still increase the safety factor of slope,and has a certainreinforcement effect on the slope under rainfall conditions.