STRESS-DEFORMATION CHARACTERISTICS OF CLAY IMPROVED BY SAND COLUMN UNDER TRIAXIAL STRESS CONDITIONS

Abstract

To study stress deformation characteristics of composite grounds, drained triaxial tests on cylindrical clay specimen with a sand column are performed. By comparing the test results with analytical values which are calculated using “SMP model” for sand and “tij-clay model” for clay, it is confirmed that the present analytical results by these models describe well the test results of the composite ground. On the other hand, those analyses using “Nonlinear elastic model” for sand and “Modified Cam-clay model” for clay are also performed. The results cannot explain well the volumetric change and the share of stresses. It is clarified that the evaluations of the dilatancy and the intermediate principal stress are important in analyzing the composite ground.