AN ASYMPTOTIC METHOD FOR MODELLING OF THE SOIL STRESS-STRAIN STATE PILE FOUNDATIONS

In modern conditions of geotechnical construction related with the problem of increasing loads on the basis of foundations of buildings and structures, and development of areas with complex engineering-geological conditions pile foundations widespread. So, the problem of economic and effective application comes of different types of pile foundations comes firstly, while ensuring a high level of reliability of buildings and structures throughout the lifetime, and the main task is to using a maximum potential of subgrade, for transmission to a maximum bearing capacity. When interacting pile with the surrounding soil occurs complex impure soil stress-strain state, which determines its load-bearing capacity and deformation, but it is not realized fully by the uneven distribution of efforts between the skin surface and the pile bottom. That are close to each other piles have skin resistance than being at a greater distance. The speed of movement of the soil caused by the combined influence of piles equals with the speed of movement of the piles, this occurs due to their mutual displacement and tangential stresses of the soil used irrationally. Analytical calculation of "rational" placement of piles, where the load-bearing capacity of soil beneath pile bottom will be used effectively and fully is the need to choose the optimum ratio between the length of piles and the distance between them. A promising direction is the applying of advanced mathematical methods, in particular the asymptotic, and to perform calculations in mathematical packages such as MathCAD, in which one can see the progress of calculation. The purpuse is to use the asymptotic method for the assessment of soil stress-strain state bases of pile foundation, a creation of the method for determining the tangential and longitudinal stresses along the pile and under the bottom edge of multilayer substrates, under static loading of piles, depending on the distance between the piles, the study of the influence of the contact at the border "pile ? subgrade". Conclusion. a method for determining the tangential and longitudinal stresses along the pile and under the bottom edge of multilayer substrates is reated and is tested, research of the effect of exposure on the border "pile - subgrade," its optimal thickness is chosen for the task.