Study On The Influence Of Typical Tree Root System On The Stability Of Soil Slope In Zhenjiang

Vegetation slope protection is a common engineering technology for slope protection and slope reinforcement.In addition to its good slope reinforcement effect,it also has many economic,environmental and cultural benefits.Vegetation slope protection has been vigorously developed at home and abroad in recent years,and slope protection technology has developed rapidly.However,the mechanism of soil fixing by vegetation is still in the exploration stage,and further research is needed.The main mechanism of plant slope protection is the effect of plant root soil fixing,combined with the mechanical mechanism of vegetation root soil fixing,the roots of tree weeping poplar and maple poplar in Zhenjiang area are taken as research objects.The shear test obtained the shear strength parameters of the root-soil composite soil,and obtained the specific influence of the root on the soil.According to the data obtained from the triaxial test,the MIDAS finite element software was used to establish the soil slope model and the root calculation model.In this paper,the numerical simulation parameter design of soil slope model is mainly carried out on four aspects of different slope protection vegetation,different planting positions,different slope slopes,and root depth of vegetation.Comparison of actual projects to guide the slope to cover the green.The main conclusions are as follows:(1)The plant root system can be regarded as a natural flexible reinforced material.The root system shape has a greater influence on the soil reinforcement effect.The main effect on the shear strength of the soil body is the vertical root system,and the horizontal root has little effect on it.There are also huge differences in the effects of different vegetation roots on the soil.(2)Through the triaxial test,it can be found that the root of the plant can enhance the cohesion of the soil.The more developed the plant root system,the more obvious the effect of strengthening the soil;the root density also has a cohesive effect on the cohesion of the root-soil composite soil,but the effect is ordinary;plant roots have little effect on the friction angle in the soil.(3)The optimal elastic modulus of the root system model established by MIDAS this time is 250 MPa.For the numerical simulation of slope stability,the results are close to the actual results.Establishing a root model can greatly simplify the steps of numerical simulation in the future,provide a reference for future numerical simulation of slopes,and can intuitively see the influence of vegetation roots on slope stability.(4)For shallow landslides,the plant root improves the slope stability by enhancing the shear strength of the soil.Vegetation roots at different locations have different effects on slope stability.The optimal placement of vegetation roots in this study is near the slope foot;the effect of the root system of vegetation on the slope stability is related to the depth of the root system,but it is not that the deeper the root system of the vegetation,the better the reinforcement effect of the slope.The plant root system does not contribute much to the stability of the slope after passing through the sliding surface,so shallow landslide protection plants do not need to select deep-rooted plants;slope has little effect on the root reinforcement effect of vegetation.