Numerical Analysis On A Multilayer Georeinforce Pavement’s Settlement

Geosynthetic is a new type of geotechnical engineering material. Now it iswidely used in the field of engineering projects.But the theoretic research ofgeoreinforced pavement lags behind the practics. Stress spreading effect in subgradeis considered litter.The geosyntheties bending stiffness and soil-geosyntheticinteraction of displacement-softening are considered litter in the analysis ofgeosynthetic deformation.So the different between theoretical results and engineeringpractice is large,and georeinforced pavement application is limited.The main studies are as follow:(1) An finite element software ansys is applied to modeling an plane strain modelto investigate the settlement of georeinforced pavement.(2) The mathematica symbol method is applied to solve the differential equationsof the settlement of the georeinforced pavement, which based on the assumptions anddeformation coordination proposed by Yin. The soft soil is represented by Winklersprings for the simplification.(3) The example analysis shows that the result caculated by symbol caculationmethod is proved to be consistent with solution in finite element method. On thatbasis the georeinforced pavement defomation beheaviors and several influence factorsare investigate. And the parameters analysis indicates that as the elastic modulus ofgranular and geosynthetic reinforcement are less than40MPa and20MParespectively,we could have a optimal achievment.The softer soil grosyntheticreinforced is used, the better effect of displacement control we have.(4)In order to investigate the georeinforced and pile-supported embankmentdeformation beheavior,a simplified plane strain georeinforced and pile-supportedmodel and a3-d georeinforced and pile-supported model is presented. In the planemodel,the piles and the soil between piles are simplified as springs with differentconstant.A quarter of the3-d model include center stake is chosen for simplication instudy.Both the solution are compared with the expriment records.The caculationresults are proved to be consisten with the experiment data.(5) Finaly, several influence factors are investigate. The models provide simpleand reliable method for georeinforced and pile-supported embankmentoptimzation.The parameter analysis shows that increase the number of geosyntheticlayer is not a good method to control the settelement of the pavement.As the pile resistant coefficient at approximately100kN/m3,we can gain the optimalachievment.And the height of the geosynthetic layer is a important factor which caninfluence the settelement by changing the thickness.