Abstract:Finite element method is applied for the analysis of the stability of rock roof above karst cave under the loading of circular footing,and three typical types of rock mass are studied. The determination of ultimate bearing capacity of rock foundation is discussed,and the ultimate bearing capacities of circular footing above karst cave,under different conditions of three different rock mass types,different karst cave width and roof thickness,are obtained. The relationships between bearing capacity and the corresponding influencing factors are analyzed. Some relationship charts for determination of ultimate bearing capacities under different conditions are presented,which are helpful for the design of circular footing above karst cave.