抄録
Soil parameters, e.g., strength coefficients c and phi, are very important factors for stability inspections of river levees against seepage failure. However, large differences have been found among the phi_cu obtained by CU triaxial tests, the phi' obtained by CU-bar triaxial tests, and the phi_d obtained by CD triaxial tests. In the present paper, a series of CU-bar and CD triaxial tests for various soil materials is carried out in order to confirm the difference in strength coefficients obtained under different triaxial test conditions. The test results suggest that CU tests are susceptible to the sample dispersion and that it is difficult to consider the c_cu and phi_cu of natural soils with these tests. On the other hand, CD and CU-bar triaxial tests are not influenced by the sample dispersion, and therefore, easy to confirm the strength coefficients.
