Settlement Analysis And Design Of Georeinforced Pavement

As a new structure prototype of pavement, the advantage of georeinforced pavement has been proved by engineering practice. But the theoretical research of georeinforced pavement lags behind practice. The cooperative behaviors of pavement contractures, subgrade. geosynthetic and soft soil ground should be further studied. Stress spreading effect in subgrade and ground is considered litter. The geosynthetics bending stiffness and soil-geosynthetic interaction of displacement-softening are considered litter in the analysis of geosynthetic deformation. So the difference between theoretical results and engineering practice is large. And georeinforced pavement application is limited.A simplified analysis model of geocell reinfocement incooperating subbase and subgrade's shear effects is proposed to investigate deformation behaviour of geocell reinforcement subject to pavement surface loads and to reveal the load transfer procedure from geocell reinforcement to subgrade. The Pasternak model, instead of the conventional Winkler model, is applied to represent subbase layer and subgrade soil to consider stress spreading in these two layers. The differential equations governing pavement and geocell reinforcement's deformations are solved using eigen decomposition technique, and a semi-analytical solution is obtained. Compuation results show that soil's shear stiffness is essential for accurately evaluating geocell reinforcement's deformation. In addition, it's found that geocell reinforcement has better performance when subgrade soil is weak.In order to confirm the deformation behaviour of georeinforced pavement on soft soil ground subject to road vehicle load and to optimize the design of georeinforced pavement. A simplified analysis model of pavement contractures. geosynthetic and soft soil ground cooperation is established. The governing differential equations of geosynthetic deflection is derived, considering geosynthetic bending stiffness and the vertical and tangential interaction characteristics between geosynthetic and surrounding soil. The whole governing equations of georeinforced pavement subject to surface load are obtained. The equations are solved using collocation method based on cubic polynomial. Reliability of the model is verified comparing with three laboratory tests results. On that basis the georeinforced pavement's deformation behaviors and several influence factors are investigated. The model provides a simple and reliable method for georeinforced pavement optimization.In order to investigate georeinforced and pile-supported embankment's deformation behaviors. A simplified analysis model of georeinforced and pile-supported embankment is presented considering soil arching effect. The load of geosynthetic is computed using load transfer procedure mode taking into account soil arching effect in embankment. Pile and soil are simplified as Winkler model. The whole governing equations of georeinforced and pile-supported embankment is derived. The equations are solved using cyclic iterative method. Reliability of the model is verified comparing with a laboratory tests results after the model change into pile-supported model. Finally, several influence factors of georeinforced and pile-supported embankment are investigated. The model provides a simple and reliable method for georeinforced and pile-supported embankment optimization.