Abstract
In conditions of heaving soil, there are tangential forces of frost heaving, which may lead to blowing out the pile foundations of above-ground oil pipeline supports. Russian design standards established the analysis and tests to determine the values of these forces. At the same time, the regulatory documents do not contain data for determining the estimated specific tangential forces of heaving acting on pile foundations of steel pipes with anti-corrosion coating. It is stipulated that for such surfaces, the values obtained in the course of laboratory or field studies shall be taken into account in analysis. The article presents the results of laboratory and field tests to determine the frost heaving forces acting on pile foundation samples made of steel pipes with and without protective coating. The data on soil temperature observations, changes in position of surface bench marks are given. Reduction factors of frost heaving tangential forces for samples with different types of coatings were found and the conclusion was made about the efficiency of the application of coatings not only for the anticorrosive protection, but also for the protection of pile from the effects of soil frost heaving.
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