Analytical studies of a stressed-strain state of soil in a pile area of foundations of oil and gas and oil refining industry facilities.

The development of new and improvement of current technologies for preparation of soil foundations and construction of foundations for oil and gas and oil refining facilities is impossible without theoretical research focused on studying the characteristics of processes occurring inside the soil mass affected by external forces. In the course of performed analytical studies, the equation of compressive stress distribution in a pile area arising due to radial forces effect on a lateral surface of a well during its formation is derived. It makes possible calculation of a relative soil deformation. A numerical solution of the derived integral Simpson equation allowed us to establish the space distribution of compressive stresses arising in a construction of pile foundations based on cast-in-place piles for oil and gas industry facilities. Based on the data obtained, the values of relative soil deformation for various depths and distances from the well were calculated. Preliminary results of analytical study for a stressed-strain state of soil in a pile area confirmed the possibility to calculate rational design parameters of expanding element for installation of cast-in-place piles of foundations for oil and gas and oil refining industry facilities and operating practices in hard natural-climatic and geotechnical conditions. [ABSTRACT FROM AUTHOR]