Analysis On The Influence Of Tree Roots On Cutting Slope Stability

With the highly development of infrastructure construction in recent years,especially in the process of road and railway construction,a large number of cutting slopes have been formed along the line,which damage the original vegetation on the surface,induce soil erosion and cause geological disasters such as collapse and landslide.Such situation endangers people’s property safety and generates serious damage to the ecological environment.Therefore,the protection methods of green ecology have been paid more attentions due to the increasing awareness of ecological environment.Tall trees own both strong taproot and thick fibrous roots used to reinforce the slope by anchoring the thick roots and reinforcing the fibrous roots,in the design of cutting slope,considering the reinforcing and anchoring action of tree root system comprehensively,the design of cutting slope can be more reasonable,which can effectively reduce the amount of earthwork and land area,and has good economic effect.In addition,tree slope protection holds numbers of other ecological-friendly functions such as water and soil conservation,air purification,landscape beautification and ecological restoration.Tree slope protection has become an inevitable trend in slope protection.Considering the mechanical effect of tree roots,this paper analyzes and studies the effect of tree roots on the overall stability of the slope.The main research content and results include:(1)Through consulting a large number of relevant research literature,the mechanism of root soil fixation is systematically expounded,the reinforcement of fibrous roots can effectively improve the deformation characteristics and shear strength of soil,and the anchorage of coarse roots can improve the overall stability of soil slope as well as the anchorage of bolt.The morphological distribution characteristics of plant roots were statistically analyzed,and the morphological characteristics of tree roots were studied.For the subgrade slope,trees with more vertical roots should be selected to better play the role of roots in fixing slope.Based on the basic action mechanism of root soil fixation,the calculation methods of reinforcing effect of fibrous roots and anchoring effect of coarse roots are proposed.(2)Through the analysis of the location characteristics of the sliding surface of the soil road cutting slope,the distribution law of the sliding surface is obtained,and the optimal planting location of the tree protection slope is determined by comprehensively considering the length of the tree root system,located within one meter away from the slope foot.(3)Using the slope safety factor computation model,the soil cutting slope in the presence of tree protection under the state of the slope stability safety coefficient is calculated.By analyzing the results of calculation,it finds that the slope stability safety factor of trees protection is obviously higher than that of unprotected natural slope.This study also analyzes the ratio of the slope,the slope height,the root length and the root diameter of trees protection slope stability safety factor of influence.Also,certain limitations of tree slope protection are discovered in the process of calculation.The steep shorter slope reinforcement effect is more significant.(4)Through case studies of the Qianlong high-speed project,through the calculation and analysis of the stability of typical sections,the optimization scheme of arbor slope protection is put forward.After the optimization scheme,the original slope design slope rate can be set steeper,which effectively reduces the amount of earthwork and the area of land,and greatly reduces the cost of protection.It is proved that arbor slope protection has a good economic effect.