In order to propose an in-situ strength evaluation method for cement treated ground, a series of isotropic consolidatin tests and undrained triaxial compression tests were performed for three kinds of cement treated soils prepared by mixing the cement with Ariake clay, Rokko decomposed granite and Akita clean sand. The strength properties were compared in relation to the cement content, the initial density of sample and the difference of original material and the main parameter governing the strength was discussed to evaluate the undrained shear strength of cement treated soil. From this study, the following conclusion was obtained; 1) the e-logp' curves of cement treated soil show a consolidation yield stress similar to untreated clay, 2) the strength properties can be characterized according to the stress level in consolidation, which are divided into the elastic region under the consolidation yield stress and the normally consolidated region, 3) the undrained shear strength notably depends on the yield stress ratio irrespective of the cement content, the initial density of sample and the difference of original material, and 4) the presented strength evaluation method was considered to be effective In estimating the in-situ strength of cement treated ground.
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