Abstract: The strength formation features of different area soft soils consolidated with cement are studied through laboratory tests; and the mechanical indexes of cement consolidated soil are determined by means of direct shear test and unconfined compression test. It is found that there is great difference in the mechanical properties of different area soft soils after the stabilization with cement, which is explained from the aspects of granular metric composition, content of organic matter of all samples and the microscope structural characters of stabilized soils. Results show that the granular metric composition and the content of organic matter in soil have great influence on consolidation effect. The more clay particles and the higher organic content in soil, the more difficult is it to enhance the strength of cement consolidated soil. So it can be for reference to select reasonable additional measurements in projects of using cement to stabilize soft soil with different properties.

Key words: cement, soft soil, mechanical index, granular metric composition, organic matter, microscope structure