坡度对含根坡体稳定性的影响

Influence of Slope Angle on Root Containing Slope Stability

为了定量化分析在不同坡度条件下植被根系对边坡稳定性的贡献,采用不固结不排水三轴压缩试验测定研究区不含根土体及2种灌木植物根-土复合体的抗剪强度参数,应用极限平衡法分析不同坡度对边坡稳定性的影响。通过算例分析,发现当坡度在25°以下时,有根系边坡的稳定系数比素土边坡的稳定系数增大1倍以上;当坡度在25°-50°之间时,种植灌木四翅滨藜的边坡稳定性较种植柠条锦鸡儿边坡平均增加38%,其中四翅滨藜可提高边坡稳定系数1.38-0.80,柠条锦鸡儿提高边坡稳定系数在1.03-0.56之间,植物根系对边坡土体发挥着重要的加筋和锚固作用;当边坡坡度超过55°时,2种灌木植物根系对边坡稳定性的影响相对较小。

In order to make a quantitative analysis of the contribution of root system on slope stability under the condition of different slope angle,unconsolidated and undrained triaxial compression test were used to measure the shear strength parameters of soil and root-soil composite in the study area,then analyzed the influences of slope angle on slope stability by limit equilibrium method. The results showed that the stability coefficient of root containing slope was higher more than one time than soil slope when the slope angle was lower than 25°. The slope stability of planting Atriplex canescens was average increased 38% than slope of planting Caragana korshinskii when the gradient was range from 25°to 50°.Atriplex canescens and Caragana korshinskii can increase slope stability coefficient 1. 38- 0. 80 and 1. 03- 0. 56 respectively,which indicated that root system have significant roles of reinforcement and anchoring on soil mass. During the slope angle was higher than 55°,the influence of two kinds of shrubs on slope stability was relatively lesser.