Geogrid Reinforcement Of Soft Soil Subgrade Time Effect And Seismic Dynamic Response Analysis

As a new kind of geotechnical material,geogrid has been widely applied in various engineering fields.With the rapid development of highway construction in recent years,a lot of highway is inevitably constructed on soft soil foundation,geogrid reinforced as an effective method of soft foundation reinforcement in construction in soft foundation reinforcement achieved good effect,but the law of reinforcement mechanism and its influencing factors,and many other aspects there are still many unknown place.In this paper,on the basis of predecessors’ work,based on the large scaled finite element numerical simulation platform ADINA,establish geogrid reinforced soft dirt road embankment plane strain model,considering the influence of pore water,conduct a parameter sensitivity analysis of reinforced embankment system and evaluate its time effect.On the basis of using the dynamic time history gradually time integral method,conduct seismic dynamic response analysis of reinforced embankment system.Specific research contents include:(1)With the equivalent static calculation of reinforced embankment system,analyse the stress redistribution and deformation caused by the consolidation settlement and deformation under the action of gravity and driving load;on this basis,calculate the reinforced embankment system aiming at various parameters such as way,spacing,layer number,modulus and elastic modulus of subgrade soil,embankment soil angle of internal friction,poisson’s ratio and cohesion,analyse the influence law of the stress and deformation of different parameters to the embankment system.The calculation results show that:reinforcement method,spacing and embankment soil angle of internal friction and cohesion of the reinforced embankment had a greater influence on the system characteristics,according to these parameters,through the orthogonal experiment design,parametric analysis to get the influence of these parameters specific coefficient,the embankment soil angle of internal friction as largest parameters influence coefficient,cohesiontake has second place.(2)Choose the typical earthquake records El-centro wave,analyse the different seismic intensity on seismic dynamic response of the reinforced embankment system,then by comparing the calculated for two kinds of conditions whether there are pore water,analyse the influence of pore water on seismic dynamic response of the system.On this basis,conduct the parametric analyses to the saturated soft soil ground reinforced embankment system,study further analysis of different parameters on the seismic dynamic response of the reinforced embankment system...