Excess soil stress may lead to an additional settlement or shear failure of the soil, which in both cases, causes damage to the structure. Therefore, geotechnical and structural engineers who design the foundation must evaluate the bearing capacity of the soil. Most of the foundations are implemented on unsaturated soils, and the use of the relations, due to considering the soil as saturated and with lower shear strength, leads to conservative results and is cost-intensive. This study discusses the optimization of the bearing capacity of shallow foundations and a comparison between deterministic and probabilistic methods. This study uses the Monte Carlo method and constructive solutions to improve the bearing capacity of shallow foundations’ performance in this study. The final bearing capacity of the foundation is obtained using the deterministic method and Hansen’s relations as 742 kN. Therefore, t permissible bearing capacity is estimated to be 247 kN considering the safety factor of 3 for normal structures and 148 kN considering the safety factor of 5 for more important structures. If the strip foundation with the mentioned specifications is analyzed using the Monte Carlo method, the cumulative distribution diagram of the bearing capacity has been shown. To choose the permissible bearing capacity of the foundation, the cumulative distribution chart of the bearing capacity can be used according to the desired confidence level. Reviewing the technical literature shows that the level of confidence required for structures is around 91 to 98 percent.
