Abstract
To reduce differential settlement between bridges or culverts and their approaches due to earthquakes, the confined-reinforced earth (CRE) method was introduced in subgrade layer, at the bottom of paved road. The method consists of granular material, geogrid layers and confining tie-rods. In order to investigate the effects of geogrid length of CRE on its behavior under differential settlement, two tests with two lateral boundary conditions, i.e., one fixed condition corresponding to long geogrid and one free condition corresponding to short geogrid, were carried out to investigate the effects. The results show that the length of CRE significantly reduces differential settlement and the deformation of long CRE case is much smaller than that of short CRE case.
