Mechanism Analysis Of Plant Roots Slope Reinforcement In Alpine Mountain

It constructs a large scale in China’s traffic fundamental instruction.Quite an amount of man-made slops due to highways and railroads paved in alpine mountain have caused serious damage in fragile ecology environment,and hinder economic sustainable development.The plant protection technique organically combines slope steadiness and economy restoration,and reinforce slopes through the interaction between plant roots and rocks,in order to meet the demands of overall slope stable condition.In the meantime this technique also work along with the ecological goal and servers as an effective protection method.First,plant protecting effects for slopes were demonstratd through both biological natures of plants and the physical effects of plant root.analyze the basic idea of slope stability,its academic meaning and influence factors.Two common analysis methods of solid slopes are also introduced,one being limit equilibrium method,the other being finite elementary method.Secondly,this study figures out the size of root reinforcement to slope model and related materials through centrifugal model test,and stimulate eight conditions for different plant distance and root buried depth.The conclusion is drawn from all centrifugal model tests of the conditions stimulated:1.By watching how the slopes change during centrifugal model tests,the damage of plain slopes could be sudden while the situation of slopes reinforced by roots are always taking gradual steps,and last longer,with higher accumulation velocity.This fact shows that root reinforcement could achieve stress adjustment through root distribution,building each part of the slope into a whole integrity.2.By watching the key points displacement in the centrifugal model test,it could tell that proper plant distance plays an important role in limiting the displacement of key points,which means that we could optimize roots distribution in earth though plant distance,and strengthen the connection between roots as well as roots and earth.3.By measuring the displacement of key points after the centrifugal model test,it could tell that the deeper the roots are buried along the slope,the more powerfully they play in slope reinforcement,and more effects are generated in limiting vertical subside and horizontal displacement.Third,qualitative analysis is introduced into plant reinforcement,suggests simplified plant root system model and finite element model of plant solid slope.Then the study adopts elastoplastic strength reduction FEM.With plant distance,plant numbers and the depth of plant root system as variables,calculating the slope security coefficient and the displacement of key points in different situations.Finally,the data of centrifugal model test and the data from finite elementary simulation were compared,find out the later performs higher stability.The conclusions drawn as follows:1.If the distances between roots are not plenty enough,then the roots will overlap in reinforced area and anchorage zones,and the stretch effect of the roots could not show its function as a result.If the distances are overly large,there will be problems for the upper roots connection and thus protecting solid falling down.Hence,proper root distance plays an important role in enhancing slope security coefficient.2.The reinforcement and anchoring effects,as well as slope security coefficient could be more easily seen with larger planting area.Also,planting direction is another affecting factor in plant reinforcement.3.Theoretically,slope security coefficient scale goes along with the depth of plant root buried.However this fact is also effected by the depth of the figurability area of the reinforcement location.The root reinforcement depth contributes more to slope security coefficient with deeper possible slip plane.This paper studies plant reinforcement slope in alpine mountain,acquires reasonable parameters including plant distance,buried depth,planting scale,and cultivation direction,through centrifugal model test and data simulation method.The results hold practical values for plant reinforcement projects design and implementation.