ANALYSIS OF LOADING OPERATING ON A SUBMARINE GAS PIPELINE, FOR THE REGION OF KARA SEA

This article analyzes the loads and impacts on the submarine pipeline for the conceptual design of the field development Kara sea, with the aim of using the results in the creation of computational model of interaction "pipe -soil - ice" by finite element method.
Pipelines, in despite of its simplicity construction, are fundamentally different from other structures by a complex scheme of existing power factors, and the level of uncertainty of the stress-strain state. At the first plane for solving the problem about the reliability are put forward tasks for the calculation strength, stability and durability. Their solution requires information about the loads and impacts on the pipeline, the analysis of stress-strain state, which will make the calculations of resource reliability.
The article briefly describes the basic meteorological conditions in the area of work, geometric parameters of the ice hummocks on the measurement data, permafrost soils distribution in the coastal zone, as well as the original, analytical and statistical data about the subsea pipeline.
Shows a schematic diagram of laying underwater pipeline taking into account soil conditions on the shelf of the Kara Sea, on the basis of stress analysis, bearing and purposes a straight section of the pipeline is put to the following calculation scheme: in determining the hoop stress (for large depth of the burying Н ≥ 20 м) a straight section of the pipeline is seen as a thin-walled cylindrical shell, which is subjected to internal pressure and temperature. In determining longitudinal stresses, a straight section on the principle of common design schemes can be classified as a straight pipe in the soil, where drawdowns are possible.