Study On Sensitivity Parameter Analysis And Design Method Of Ring Geogrid Reinforced Retaining Wall

Ring geogrid reinforced retaining wall is a new type of high-filled retaining structure,which is currently under development and study.In order to deeply study the influence of structural design parameters such as the wall panel structure and the geometric layout of the reinforced materials on the stability and reliability of the retaining wall,the large-scale numerical analysis software FLAC3D was used to conduct in-depth research on the reinforced ring retaining wall.In the course of the research,the stiffness,connection form and foundation form of the force wall panel,as well as the diameter,height,length and spacing of the reinforced ring are mainly considered.The main conclusions are as follows:1.The reinforced ring mainly applies an equivalent confining pressure to the filling in the ring through its hoop effect.Under the effect of the equivalent confining pressure,the shearing force that may occur in the filling in the ring is smaller.A plurality of reinforced rings are connected in series and laid in the filling to form a stable stiffened ring retaining wall.In the external stability analysis of the reinforced ring retaining wall,the entire reinforced body is regarded as a gravity-like retaining wall to check its antisliding stability.The internal stability of the reinforced ring retaining wall mainly considers the anti-stability stability of the reinforced-soil-layer when the top is partially uniformly distributed or concentrated.Reinforced ring retaining walls are mainly suitable for high fill projects in mountainous areas with poor foundations and limited sites.2.Compensate the calculation parameters by comparing it with the actual triaxial experiments,so as to improve the reliability of the calculation model.The stiffness of the wall panel is converted to the analysis of the stability of the retaining wall by the thickness of the panel.It is concluded that the earth pressure increases with the increase of the wall thickness,and the displacement of the wall panel decreases with the increase of the wall thickness.In the connection method,it was found that the earth pressure when using the reinforcement connection was greater than that of the anchor cable connection,but the displacement of the wall panel was smaller than that of the anchor cable connection.At the same time,when the retaining wall panel is connected with ribs,the structural internal force of the wall panel can be greatly reduced;when studying the foundation form of the wall panel,it is concluded that the earth pressure of the wall toe foundation is greater than that of the cup base,and the wall panel displacement is more than that of the cup type.The structural internal force of the panel using the wall toe foundation is mainly concentrated near the foot of the wall.3.The research on the arrangement form and geometric parameters of the reinforcement ring found that the earth pressure is the largest when the diameter of the reinforcement ring is 1.2m.The displacement of the retaining wall panel increases as the diameter of the reinforcement ring increases.When considering the height of the reinforcement ring,the earth pressure increases with the reinforcement height at the foot of the wall,but the opposite is true at the middle and upper part.The displacement of the wall panel decreases as the height of the reinforcement increases;when the length of the reinforcement changes,the displacement response of the retaining wall is obvious.The greater the length of the reinforcement,the smaller the overall displacement.However,the earth pressure is still positively related to the length of the reinforcement at the foot of the wall,and negatively related to the length of the reinforcement at the middle and upper parts;the response of the earth pressure to the reinforcement distance is mainly concentrated in the foot of the wall,and the distribution and displacement of the overall earth pressure and the height of the reinforcement The response law is similar.4.Orthogonal experiment to study the degree of influence of various factors on the stability index of the retaining wall.The results show that there is a concentration of earth pressure at the foot of the wall,which is mainly affected by the diameter of the reinforcement ring,the height and distance of the reinforcement ring.The response of the earth pressure in the upper and middle part of the retaining wall to the parameters of the reinforced ring is more balanced,but the response to the parameters of the retaining wall panel is weak.The displacement of the retaining wall mainly responds to the length of the reinforcement,the diameter of the reinforcement ring,the distance between the reinforcement and the thickness of the retaining wall panel.With reference to the results of the orthogonal experiment and the previous analysis,suggestions are made on the selection of design parameters of the reinforced ring retaining wall..