Research On Treatment Technique Of Diffidential Settlement Between Old And New Urban Road Embankment's And Surface's Junction Plane

The rebuilding and extension of urban roads is an effective measure to improve urban traffic capacity. It could not only solve the investment difficulty effectively, but also meet the increasingly traffic demand. This paper is focusing on the weak junction in the new and old road base and road surface of urban road rebuilding and extension. According to field survey, the common disease of the junction in the new and old road base and road surface is investigated and its mechanism is analyzed, showing that the surface uneven settlement is the main reason that causes junction disease. The treatment technique of differential settlement for junction problem in the rebuilding and extension of unban roads is studied from three levels, i.e. foundation, road base and road surface. The main problem is the connection between the interface of new and old road base. Finally, the finite element analysis software ANSYS is applied, getting the result that the way of excavating step and laying geogrid in junction of the new and old road base and road surface to reduce the differential settlement could indeed play an effective role in reducing the differential settlement in junction. The effect of reducing the differential settlement changes according to the different way of laying the geogrid.