СОПРОТИВЛЕНИЕ ОСНОВАНИЯ БУРОНАБИВНОЙ ВИСЯЧЕЙ СВАИ ВНЕШНЕЙ НАГРУЗКЕ

Abstract

The static load test of a bored hanging pile does not provide sufficient data on the resistance of clay soils of the pile base. Based on the results of a standard test, it is impossible to judge the causes of linearity and nonlinearity of base deformations, changes in the settlement rate, types of resistance and distribution of forces, and the effect of a loaded pile on adjacent piles and underground structures. Based on the analysis of test materials and observations of structures under construction and in operation, laboratory modeling and calculations, a foundation resistance scheme and methods for determining its parameters are proposed. The diagram includes resistance forces along the lateral surface, under the lower end of the pile and at the periphery of the base. Part of the external load is transferred by the soil to the periphery of the base by shear and separation cracks formed in soils, which are fragilely destroyed during deformations under the action of elastic forces at the contact of the soil with the lateral surface and under the lower end of the pile. The reaction of the soil at the periphery of the base contains both elastic and plastic components of vertical and horizontal orientations. The implementation of the scheme is possible when testing the pile by the method of a constant rate of loading (CRL) with continuous measurement of soil deformations at the contact with the lateral surface, at a distance from it using depth marks, soil pressure under the lower end of the pile and registering their readings synchronously registering pile settlement.