Mesomechanism Research On Geogrid Treatment High Embankment

There is a large-scale highway construction in the western region, inevitable toencounter high embankment fill ferret out and the old road renovation expansion ofengineering problems. To treat the high embankment disease become one of the focus ofthe engineering. In the embankment load, differential settlement, lateral displacement andso on will give the normal operation of the road pose a security risk. In order to betterconstrain the high embankment easier to produce large settlement in their tall loads andcontrol of the new and old roadbed uneven settlement, improve the bearing capacity of thehigh embankment, increase the overall stability of the high embankment, we will usegeogrid laid as a reinforcement material in the high embankment, transmiting tensile stress,sharing of soil stress, and increase soil deformation modulus, so increasing the strength ofthe soil, enhance ing soil stability.Use the pull-out test instrument, pull-out test on high embankment fill and geogrid, tostudy site filler and geogrid interface mechanism. Respectively give different normal loadsfiller and geogrid pullout test, to analysis the the related macroscopic parameters of the thefiller and geogrid drawing interface changes and tendons soil interface characteristics.Based on interior pull-out test, application PFC particle flow numerical simulation,conventional triaxial test results can be used for analog gravel soil mechanical propertiesof mesoscopic parameters, the establishment of a more reasonable reinforced soil particleflow numerical simulation model. Usen interior macro-drawing test results of drawingcurves, to verify the feasibility of the discrete element numerical simulation. By numericalsimulation, drawing from the soil displacement field, drawing stress field, soil contact,revealing geogrid reinforced sand Mesomechanism. Important conclusions: in the largenormal pressure,the filler is compacted, the greater the peak interfacial shear stress, withthe peak corresponding to the drawing displacement is larger.,and the growth rate israpid.The smaller of normal pressure, the grille role is not obvious.High fill for the actual field test, drawing test and reinforced soil numericalsimulation as a reference to improve the treatment effect of reinforcement. Use macrowidening high embankment on-site test results to verify the effectiveness of the localhigh-fill the2D PFC particle flow numerical simulation model. Combine the fieldexperiment and numerical simulation analysis, by force, soil porosity, contact number andthe slip ratio aspects from the grill grille, from the outside of the embankment to thecenter of the embankment gradually play a reinforced geotextile and from the macro andmeso reveal the microscopic mechanism of geogrid treatment under high embankment.Important conclusions: in the widening section, the geogrid tension is from outside toinside, gradually play a reinforced effect. In the overlapping parts of the old and newembankment, the geogrid tension is more significant. The geogrid help coordination ofnew and old embankment deformation and balanced force. Provide a theoretical basis forthe subsequent design of theoretical analysis and experimental analysis of the construction. The results provide a theoretical basis for the subsequent design theory analysis andconstruction of test analysis...