Dynamic Response and Mechanical Behaviours of Geogrid for High Earth-rockfill Dams

Due to the complexity of the interaction between the geogrid and the soil interface in high earth-rock dams, the method of replacing the grid with steel bars may neglect the interaction between the geogrid and the soil. The finite difference software FLAC3D is applied, and the geogrid element is used to simulate the geogrid and the coupling interface. Then, the deformation value of the dam under the action of the earthquake is obtained by calculation; the potential slip surface position is calculated and analyzed; by developing a safety factor time history calculation method using FISH language, the safety factor time history curve is obtained. The calculation results: after the high earth-rock dam is reinforced by reasonable layout, the deformation of the dam body is reduced, the sliding surface of the dam slope is moved down, the safety factor is increased, and the reinforcement effect is obvious. Through the engineering example of Shuangjiangkou core wall dam, the rationality and applicability of geogrid-reinforced high earth-rock dams are verified. The research results provide a theoretical basis for the seismic safety evaluation and reinforcement measures of high earth-rock dams.