he GDS single vibration triaxial test is carried out on the marine deposit soft clay in line 1 of Ningbo urban rail transit

and the dynamic strength and pore pressure property of the soft clay in condition of different dynamic stress amplitudes and frequencies are analyzed. It is shown that the shear strength in isotropic consolidation is greater than that of K0 consolidation in case of similar dynamic stress. The shear strength increases with increasing frequency in the same dynamic amplitude. Furthermore

the greater dynamic stress is used in the test

the higher shear strength of samples is obtained; and a hardening phenomenon occurs. With increasing of vibration times

pore pressure increases

except that there occurs a stable tendency in layer ③ when the stress amplitude is 5kPa. At last

the data of the dynamic triaxial test is fitted; and the parameters are used to model the accumulative pore pressure.