WORK OF DRILLING PILLS WITH EXTENDED HEEL IN SWELLING SOILS BY NUMERICAL METHOD OF BOUNDARY ELEMENTS

The topic is devoted to the topical problem of foundation construction and soil mechanics - elastic-plastic modeling of joint work of the system "soil base - brown pile" in order to determine the bearing capacity of the foundation to ensure stability and low subsidence of the structure, thus avoiding its possible uneven subsidence or destruction. To do this, it is necessary to provide forecasting and numerical implementation of calculations of the pile foundation structure. From the standpoint of the mechanics of a dispersed elastic-plastic medium, the idea of the peculiarities of the behavior under the load of a brown pile with an extended heel in clay swellable soils is presented. The calculations take into account the main content of the theory of elastic-plastic processes - the dependence of the stress- deformed state on the load history. The main computational equation of the soil model is the integral equation received K. Brebbia [1]. Depending on the properties of the soil and the applied stresses, the sediment of the building is carried out as a result of compaction or extrusion of the soil from under the foundation. In both cases, the phenomenon of subsidence is due to soil flow, so it is natural that to the forefront of solving static problems of foundation construction is a condition or equation that determines the boundary between solid and fluid state of the soil depending on stresses. The application of numerical MGE to the solution of the nonlinear problem of geomechanics is substantiated by theoretical calculations, supported and illustrated by data of numerical calculation