植被根系对黄土边坡稳定性及固土效果的影响

为了研究植被根系对黄土边坡稳定性及固土效果的影响,通过室内直剪试验、模型试验及数值模拟方法,研究了植被根系对黄土强度、边坡抗冲刷能力、边坡渗流场的影响。结果表明,植被根系可明显提高黄土抗剪强度,且随着植被根系数量的增多,黄土的最大抗剪强度和残余抗剪强度均有明显增大;坡表种植植被后,黄土边坡表面的抗冲刷能力增强,在相同的水流冲刷条件下,原状黄土的冲刷深度为20cm,种植植被后冲刷深度仅为1.5cm,可见植被根系对黄土具有较好的保持作用,渗流数值模拟发现坡面种植植被后,防渗效果明显提高。

Effect of Vegetation Root System on Stability and Soil Consolidation of Loess Slope

In order to study the impact of vegetation roots on the stability of loess slope and soil consolidation effect, indoor direct shear test, model test and numerical simulation were carried out to study the effects of vegetation roots on Loess strength, slope erosion resistance and slope seepage field. The results show that vegetation roots can significantly improve the shear strength of loess, and with the increase of the number of vegetation roots, the maximum shear strength and residual shear strength of loess are significantly increased. After planting vegetation on the slope surface, the anti scouring ability of the loess slope surface is enhanced. Under the same water flow scouring conditions, the scouring depth of undisturbed loess is 20 cm, and that of planted vegetation is only 1.5 cm. It shows that the vegetation root system has a good effect on the Loess conservation. The seepage numerical simulation shows that the seepage control effect is obviously improved after planting vegetation on the slope.