Study on Deformation Characteristics of Extended Highway in Operation Period

Highway widening has become an effective way to improve the carrying capacity of existing expressways. However, assume that differential settlement between new and old subgrades is not controlled. In case, it will lead longitudinal cracks on pavement, which seriously affect safety vehicles. this study, variations elastic modulus dynamic under traffic load were studied by tests. A hyperbolic model increasing with strain proposed. The numerical calculation established. deformation characteristics without treatment measures setting up geogrid geocell are studied. main conclusions as follows: (1) increase subgrade depth, changes significantly in early stage small later stage. (2) Under condition no measures, vertical horizontal surface show a trend then decreasing distance from center line subgrade. (3) Setting can effectively reduce subgrades. (4) effect better than geogrid.