Numerical Simulation Study Of Gabion Retaining Wall On The Mountain Road

Our country is a mountainous country,mountain road have an important role for regional economic,cultural,political functions.However,due to the complex geological conditions of mountain road,especially along the river in Southwest of China,damaged roads is serious.There is an urgent need for research to be able to quickly reopen the roads,while long-term reinforcement of retaining embankment along the way.relative to other ways of retaining,Gabion retaining wall has an advantage of Drawn convenience,Pipeline construction,industrial production,especially,the earth pressure itself suffered can be dissipated to some extent because of its unique flexible structure.since there is no consideration of deformation of the flexible structure in the conventional design,so it is become an important research topic for gabion retaining wall mechanical characteristics.Particle discrete element method is rapid development in recent years,the PFC software,based on this method,can accurately simulate discrete problem in geotechnical engineering.Gabion retaining wall is established on the basis of discrete element particle model,its deformation characteristics,value of the horizontal and vertical soil pressure can be got under different filling.Since when it is as a whole study in the numerical calculation of gabion retaining wall and filling,it is possible to take dissipation effect into account of the earth pressure generated by the deformation of gabion,as well as to ensure the reliability of the calculations in this article.The main research work and conclusions are:1)Summarizes the theory of discrete element method and the particle flow calculation damping,time step,the constitutive model.Based on this,the characteristics of particle flow calculation are analyzed.2)The stress strain diagram of three axial compressions was obtained by analyzing laboratory experiments.According to the unconfined compression test of the caged monomer,we can obtain the stress strain curve of compression test of the caged cage and reach a decision that the caged monomer is in the state of load because of the coupling of wire and stone.3)Using numerical simulation small experiments: triaxial compression and unconfined compression numerical model to determine the friction coefficient of the particle,the stiffness of the wall is 0.1 times the stiffness of the grain,and the stiffness of the pressure plate should be ten times the stiffness of the grain.Finally by comparing the stress and strain curve of the indoor experiment and numerical simulation,determine some mesoscopic parameters of the filled soil,stone cage monomer and the load,such as friction factor,tangential stiffness,normal stiffness,normal pressure,angential pressure.4)We build gabion-wall numerical model with PFC,considering different gravel filling and we will get different earth pressure valu.