СТРІЧКОВИЙ ФУНДАМЕНТ З ПОВЗДОВЖНІМ ВИРІЗОМ ПО ПІДОШВІ МАСИВНОЇ ПІДПІРНОЇ СТІНИ

Abstract

The paper analyzes the designs of traditional strip foundations with a flat bottom, the load from which causes the plane strain stress state of the soil base, and other variations of conventionally strip (continuous) foundations, which due to their shape (configuration) of the contact area with the base change its stress state, which enables designing more sustainable foundations for continuous buildings and structures. Proceeding from the solutions to the mixed problem of the theory of elasticity and plasticity using the Mohr-Coulomb criterion strength criterion, analytical studies of the development of plastic zones in the base of a strip foundation with a longitudinal cut-out have been conducted, which show that the limit state always occurs first in the foundation’s edge zones, that is, underneath the outer edges of the foundation. It is also noted, however, that the design resistance of soil decreases when there is no additional load in the area of the cut-out; therefore, a patented design has been proposed of a strip foundation with a longitudinal cut-out in the bottom, where the cut-out with the height is filled with low-modulus material to improve the design resistance of soil. Based on experimental and theoretical studies, methods have been proposed for calculating the soil base (design resistance , settlement and inclination ) for a strip foundation of a massive retaining wall with a longitudinal cut-out in the bottom. A real example shows that the total width of the strip foundation with a cut-out is shorter by 1.5 m in comparison with the continuous shape of the bottom of the foundation, which has a significant economic effect on every linear meter of the wall foundation. Overall, the proposed methods make it possible to reasonably design effective eccentrically loaded foundations with cut-outs in the bottom and to improve the permissible vertical pressure on the base in comparison with a continuous bottom, all other things being equal. Keywords: strip foundation, massive retaining wall, eccentricity, bottom, cut-out, soil base, calculation procedure.