Abstract: In order to research the behaviors of the geogrids reinforced soil retaining wall of wrapped face in the railway main line of China, the tests, including the basement pressure and lateral pressure of the reinforced soil wall, the tensile force of the reinforcement and the lateral deformation in-situ are done. The vertical basement pressure, the distribution of tensile force along reinforcement, the potential slide surface and the lateral earth pressure along height are analyzed. The basement vertical pressure of reinforced soil retaining wall is nonlinear along the reinforcement length, and the maximum value is at the middle of the reinforcement length, moreover the value reduce gradually at former and bottom. The testing lateral pressure of the reinforced soil wall is nonlinear along the height; and the value is less than the active lateral earth pressure. The distribution of tensile strain along reinforcement at the upper wall is single peak value; but the distribution of tensile strain along reinforcement at the lower wall is twin peak values. The potential fracture plane at upper wall is similar to “0.3H” method; but the potential fracture plane at lower wall is near to the active Rankine earth pressure theory. The position of the maxmium lateral displacement of the wall face during construction is at lower wall; moreover the position of the maxmium lateral displacement of the wall face after construction is at top of the wall.

Key words: wrapped face, geogrids, reinforcement soil wall, in-situ test