Shear Resistance and Stability Study of Embankments Using Different Shear Resistance Parameters of Soft Soils from Laboratory and Field Tests: A Case Study of Hai Phong City, Viet Nam

The shear resistance is very different with different soft soils. Even in same soft soil type, shear resistance have significant difference utilizing different experimental methods. Calculation of embankment stability using these factors would give different results for the same problem. The main objective of this study is to study difference between shear resistances using shear resistance parameters of soft soils from different experiments, and evaluate the difference of stability calculation results of embankments using these parameters. The data was collected in Hai Phong area (Viet Nam) for three types of soft soils such as clay silt, mixed clay silt, and plastic�flow mixed clay. Embankment has been simulated as a section of national highway No.5. Bishop simplified method has ben applied to calculate the stability of embankment. The result shows that safety factor is the highest in the case using parameters from triaxial shear test with C�U� scheme (Fs = 2.118), followed by triaxial shear test with CU (Fs = 1.628), vane shear test (Fs = 1.226), triaxial shear test with UU (Fs = 0.451), and direct shear test (Fs = 0.334), respectively. Additionally, this study also suggests the selection of suitable parameters in calculating embankment stability for specific cases. The result obtained in this study might be helpful for construction engineers in calculating embankment stability.