title: ÐÑÐ¾Ð±Ð»ÐµÐ¼Ñ Ð¼ÐµÑ Ð°Ð½Ð¸ÐºÐ¸ Ð¸ ÑÐµÑÐ¼Ð¾Ð´Ð¸Ð½Ð°Ð¼Ð¸ÐºÐ¸ Ð²ÐµÑÐ½Ð¾Ð¼ÐµÑÐ·Ð»ÑÑ Ð³ÑÑÐ½ÑÐ¾Ð² Ð¿ÑÐ¸ Ð¿ÑÐ¾ÐµÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ð¸ ÑÑÑÐ±Ð¾Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¾Ð² Ð¿Ð¾Ð´Ð·ÐµÐ¼Ð½Ð¾Ð³Ð¾ Ð·Ð°Ð»ÐµÐ³Ð°Ð½Ð¸Ñ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Problems of mechanics and thermodynamics of permafrost soils in the design of underground pipelines
Creators: name: ÐÐµÑÐµÐºÑÐµÑÑ, ÐÐ»ÐµÐ³
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2022
Subjects: Ð¢ÑÑÐ±Ð¾Ð¿ÑÐ¾Ð²Ð¾Ð´Ñ Ð¼Ð°Ð³Ð¸ÑÑÑÐ°Ð»ÑÐ½ÑÐµ
ÐÐµÑÐ½Ð°Ñ Ð¼ÐµÑÐ·Ð»Ð¾ÑÐ°
Ð·Ð°Ð´Ð°ÑÐ° Ð¡ÑÐµÑÐ°Ð½Ð°
ÑÐ°Ð·Ð¾Ð²ÑÐ¹ Ð¿ÐµÑÐµÑ Ð¾Ð´
Stefan problem
phase transition

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description: The subject of the graduate qualification work is âProblems of mechanics and thermodynamics of permafrost soils in the design of underground pipelinesâ. This work is devoted to the numerical study of the stress-strain state of pipelines in frozen soils during thawing season. Two methods of numerical modeling of pipeline-ground interaction are investigated: ground springs method and a thermomechanical calculation considering phase transition in soil. The analysis of the velocity of the boundary of the phase transition in the finite element model is performed. Tasks that were solved during the study: 1. Investigation of the phase transitions in soils. 2. Building a finite-element model of the pipelineâground system. 3. Analysis of the phase transition boundary velocity and position. 4. Assessment of vertical movements of the pipeline caused by subsidence. 5. Estimation of Mises equivalent stresses in the pipeline with an assessed subsidence value using the ground springs method. The object of study is pipeline with its geometric parameters and physical properties, thermomechanical properties of the soil and climatic information. The results confirm the importance of taking into account the phase transition in the model, that result in a more accurate assessment of the stress-strain state of the pipeline. The results confirm the importance of the damping effect of the phase transition boundaryâs velocity, which should be considered. The finite-element model makes it possible to determine the position of this boundary in the soil without directly solving the system of heat conduction equations, which appears to be intensive.