Abstract: The static bearing capacity of suction caisson with single-and four-caissons in saturated sand foundation is
studied by experiments. The characteristics of bearing capacity under vertical and horizontal loadings are obtained ex-
perimentally. The effects of loading direction on the bearing capacity of four-caissons are studied under horizontal load-
ing. The comparison of the bearing capacity of single-caisson and four-caisson foundation, the sealed condition of cais-
son’s top and loading rate are analyzed.