Stress path tests of cohesive soil

Deformation and strengthening behaviors of cohesive soil at the west area of Nanjing city were investigated by using GDS triaxial instrument, the triaxial tests were carried out under consolidated undrained condition with different stress paths, which include conventional triaxial compression, reduced triaxial compression and with constant p. The results show that the response of stress-strain is nonlinear hardening; the peak strength and the pore pressure are obviously different in different stress pathes. The shape of effective stress path is similar under the same stress path testing, the S' shape of effective stress path was observed in conventional triaxial compression test.