The researchers studied how to predict liquefaction in sand deposits by comparing Standard Penetration Test (SPT) values with stress ratios in the field. They conducted cyclic triaxial tests on different sands to evaluate their liquefaction potential. By analyzing the data, they obtained correction factors for SPT values and compared them with previous findings. The results showed relationships between overburden pressure, sand type, and SPT values, helping to assess liquefaction risk. The study extended the understanding of liquefaction prediction by combining laboratory and field data.