Modified Fellenius' slip circle method and Simplified Bishop's slip circle method have been commonly used for analysis of slope stability and bearing capacity of ground in practice. However, it is well known that, in the case of sandy ground, Modified Fellenius' method underestimates the safety factor, while Simplified Bishop's method overestimates the safety factor. In this study. a new slip circle method is developed for the purpose of accurate analysis of sandy ground. The main conclusions are summarized as follows:
1)A new slip circle method is proposed, where the shear force - normal force ratio on lateral surface of each slice is assumed to be 1/3.5.
2)By using the proposed method, a set of bearing capacity factor of shallow foundation, Nc、Nq、Nγ, which are almost same as the values of plasticity solution, can be calculated.
3)Based on the back-analyses of case records, it was examined that the safety factor for slope stability calculated by the proposed method explains actual performance of soil structures fairly well.
4)To calculate the bearing capacity of ground which consists of upper sand layer and lower clayey layer, the use of proposed slip circle method is recommended.