Liquefaction study for soils under earthquakes

In this research, studying the generation pore water pressure in saturated soils as a result of dynamic loading from SPT test for a site investigation in two different sites and two types of soils, especially for the foundation machinery, and studying the possibility of liquefaction as a result of the dynamic loads with different acceleration (0.05, 0.1 and 0.25) g by using computer program LiquifyPro. The analysis results showed that for cohesionless soil at acceleration 0.05g the factor of safety was less than 1, the settlement less than 9 cm, and the Cyclic Stress Ratio (CSR) about 0.1. At acceleration 0.1g the factor of safety was about 0.4, settlement less than 20 cm, and CSR about 0.25. At acceleration 0.25g the factor of safety was less than 0.2, the settlement was more than 30 cm, and CSR about 0.55. And for cohesive soil at acceleration (0.05 and 0.1)g the factor of safety was more than 2, the CSR about 0.1 and there was no settlement and at acceleration 0.25g the factor of safety was less than 0.8, the settlement less than 6 cm and CSR about 0.35.