Estimate seismic bearing capacity of shallow foundation on soft soil by approach

Abstract

The calculating design of the foundation structures under the dynamic load and the liquefaction effect of the ground is a problem that has attracted researchers for many years. The calculation theory for determining the ultimate dynamic load capacity of the foundation is largely analyzed for the design of shallow foundations under seismic loads based on the assumption that the failure zones in the soil occur along the affected failure surface of static load, this is a pseudo-static approach. In fact, to calculate the bearing capacity under seismic action, it is usually increased by a factor of 1.25 as recommended in some international standards. And several researchers have developed dynamic load coefficients (Nc, Nq, Ng) under dynamic loads to establish a mathematical model to determine the ultimate load capacity estimate based on the assumption that the seismic force is quasi-static in nature and at the same time according to the dynamic method taking into account the increase by the vibrating earth mass. This artical presents an approach to calculating the design of shallow foundations subjected to dynamic loads according to quasi-static, limit equilibrium analysis and seismic dynamic methods.