Field Test Research on Geogrid Reinforced Earth High Retaining Wall

According to the field test on three different geogrid reinforced earth high retaining walls,wall bottom pressure,geogrid deformation and fracture plane for the retaining wall were analyzed.Research results show that the distribution of wall bottom pressure exists single peak,and the observed value of wall bottom pressure is greater than relevant γ·H.Geogrid deformation distribution along transect exists double peak,the peak value around wall face is mostly affected by the construction technology and lateral restraint of wall face.Geogrid deformation increases continuously with the growth of filling height.Geogrid deformation value gradually decreases in a period of time during post-construction measuring stage,namely the most disadvantageous construction condition occurs at the end of construction stage from the view of the collapse mode of geogrid tensile failure.Double peak in the geogrid deformation distribution leads to two observed fracture planes.The fracture plane 1 which is close to wall face does not represent active earth pressure fracture plane,while the fracture plane 2 does.Therefore,design safety margin of wall bottom pressure should be increased,and the design for geogrid should consider construction technology and lateral restraint of wall face.