Engineering properties of cement-treated Soils have been studied based on the soil specimen prepared in the laboratory with sufficient mixedness. In practice, however, a number of teated soil columns are manufacturaed successively by the spacing smaller than the diameter of columns to form a continuous treated soil mass and the mixendness of these soil-cement mixture is naturally low in comparison with the specimen prepared in the laboratory. For the present study, two treated soil columns overlapped each other were manufactured insitu by the ordinary procedure and withdrawn from the sea bottom. Test specimens are sampled from these colum
ns by means of double core tube sampler. The disribution of cement content and unconfined compressive strength within a single column is found to be relatively uniform.
　However, it is found that the strength of the first column is reduced considerably probably by the disturbance due to manufacturing of the second column. Anisotropy of strength and permeability is not recognized. The correlations of various engineering characteristics known for the laboratory specimen are found to be applicable to the specimen obtained insitu.