Calculation of bearing capacity for multi-slot foundations

This article presents the calculation results of the bearing capacity of two- and three-slot foundations on a homogeneous base, performed using the FEA computer program, which implements the finite element method. Based on these results, the influence of various factors (foundation embedment depth, distance between the slots, and the lateral earth pressure coefficient of the surrounding soil) on the soil’s stress state and the development of Coulomb plastic deformation zones was assessed. The calculations were performed with a ratio of the reinforced concrete’s modulus of elasticity to the soil’s modulus of deformation equal to 103 , which, as demonstrated in the work, corresponds to a realistic value. It was shown that the use of a threeslotted Ш-shaped foundation is not advisable because it is inferior to a two-slotted П-shaped foundation in both bearing capacity and settlement, under otherwise equal conditions. Analysis of the comparative calculation results indicated that the numerical values of the bearing capacity for a two-slot foundation, calculated according to SNiP and SP recommendations, can be reproduced using the FEA program for specific values of the lateral soil pressure coefficient. Consequently, the FEA computer program is recommended for use in relevant calculations.