Analysis of Dynamic Deformation Response of Closely Spaced Square Footings on Geogrid-Reinforced Sand under Cyclic Loading

In order to obtain the optimal spacing of closely spaced footings under cyclic dynamic loading, model tests were carried out on unreinforced and reinforced sand foundations. The influence center point (S) bearing capacity foundation load is discussed. test results show following: (1) peak largest when S/B = 2.0 (B width footing), ultimate 20% higher than that foundation. (2) vertical soil pressure at different positions with ratios (S/B) lower foundation, buried depths (‘1-3’, ‘2-3’, ‘3-3’ positions) are smaller below (‘1-2’, ‘2-2’, ‘3-2’ positions). (3) When 2.0, strain geogrid acceleration smallest, indicating has little transient change this spacing. From aspects design engineering economic benefits, it suggested between should be arranged according two times footing (S/B 2.0).