Abstract: Granitic residual soils are widely distributed in Yunnan Province and their engineering geology properties have a great influence on the engineering properties due to their unique geological characteristics. This paper presents the physical and mechanical properties of the granitic residual soils in a highway project in the southwest Yunnan Province. The feasibility of using this material was evaluated from many aspects, such as, coarse grain content, optimum moisture content, CBR values and in-situ dynamic cone penetration tests. Suggestions and recommendations of using this material has also presented in this paper.

Key words: Granite Residual Soils, Southwest Yunnan Province, Coarse Grain Content, Optimum Moisture Contents, CBR Values