Research Information System
SOCAR PROCEEDINGS, pp.105-112, 2025 (ESCI, Scopus)
In recent years, when constructing and performing major repairs of main pipelines in swamps, underwater sea and river
crossings, concrete-coated pipes are used to prevent them from floating up. Experience in their operation in difficult natural
and climatic conditions has shown that concrete-coated pipes float up before gas is supplied. The purpose of the research is to
establish the influence of operating conditions and design features on the floating up of a gas pipeline in a swamp. To simulate
the stress-strain state (SSS) of a gas pipeline in a swamp, a one-dimensional rod system is used, consisting of rods with tubular
cross-sections and junctions of these rods. Geometrical and physical relationships, equilibrium equations for the rod are transformed into a normal system of nonlinear ordinary differential equations. When integrating this system, the Godunov orthogonal sweep method is used. Systems of algebraic equilibrium equations are composed at the junction nodes of the rods; their
solutions are found by the Gauss method. Computer modeling of the gas pipeline SDS in a swamp before gas supply established
the influence of the specific gravity of swamp water on its floating, depending on the concentration of mineral salts dissolved in
it and the remains of decomposition of plant origin, the length of the flooded underwater part. Recommendations are made to
change the design of the concrete-coated pipe to prevent its floating (geometric dimensions of the concrete shell and steel pipe).