Development of methods for the evaluation of the geometric characteristics of the filling material of the base of the underground gas and oil pipeline

When assessing the contact forces at the base of an underground gas and oil pipeline, the geometric characteristics of the real ground of the base play an important role. The main geometric characteristics of large-block foundation soils include the particle size, the shape of the fragments in terms of sphericity and angularity. As part of the study of discrete soils, we do not consider cemented rocks consisting of large–block rocks, due to the need for their processing by the method of breaking the bonds between particles - crushing. The widest fraction as a building material are pebbles and crushed stone soils. Natural gravel is quarried. The quarry method is carried out in an open way using excavators, and the closed one is dredged, thanks to which material is pumped from the bottom of the sea, rivers or lakes. Further, as in the variant with crushed stone, work is underway on crushing large pieces and sorting into fractions. In the process, coarse—grained soil is sifted, sometimes washed, cleaned of foreign particles - clay, sand, soil. The article provides recommendations for improving the methods for assessing the geometric characteristics of soil particles in the filling of an underground gas and oil pipeline when passing in gravel and cobbles.