Calculation Method for Seismic Active Earth Pressure on Constraint Ends of Bilaterally Wrapped Geogrid-Reinforced Embankments Under Strip Load

The bilaterally wrapped geogrid-reinforced embankment is a new type of structure. These embankments consist of reverse wrap reinforcement on both sides of the embankment, which replaces the traditional wall panel. Based on the distribution mode of the tensile force of the reinforcements along the height determined by model tests, a calculation method for seismic active earth pressure on wrapped constraint ends has been established using the horizontal slice method and the quasi-static method. The proposed method can determine the distribution pattern, resultant force, and point of action of seismic active earth pressure. The influence of the filling and reinforcement properties, reinforcement spacing, and strip surcharge on the seismic active earth pressure are analyzed. The average calculation error between the proposed method and some existing methods only applicable to the resultant force was approximately 5%. When the cohesion increases, the reduced range of the earth pressure is mainly below a height of 0.8 H. When the internal friction angle increases, the reduction of the earth pressure is primarily concentrated on the segment above 0.37 H. The influence of the strip surcharge and seismic forces on the earth pressure is primarily concentrated on the segment above 0.37 H from the embankment bottom. In the case of positive k_h, the earth pressures are mainly concentrated in the region above 0.33 H, with the maximum occurring near the top of the embankment.