STRESS-STRAIN STATE OF A PIPELINE BURIED IN AREAS OF DISTRIBUTION OF HEAVY SOILS

• Published in: Bulletin of the Tomsk Polytechnic University Geo Assets Engineering
• Main Authors: Elvira V. Fayzullina, Mariya A. Parshikova, Denis A. Gulin, Timur S. Sultanmagomedov, Sultanmagomed M. Sultanmagomedov, Timur R. Nasibullin
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Tomsk Polytechnic University 2022
• Subjects: pipeline; stress-strain state; heaving; construction; simulation; Engineering geology. Rock mechanics. Soil mechanics. Underground construction; TA703-712; permafrost
• Online Access: https://doi.org/10.18799/24131830/2022/9/3595; https://doaj.org/article/054eb08e2cec45c8be7e4e432c4f1095

The relevance. The article deals with the problem of construction and operation of pipelines in the areas of distribution of heaving soils. The problem under consideration is relevant, since one of the main reasons complicating the process of laying pipeline systems in the northern regions is frost heaving, which consists in a multiple increase in the volume of wet soils during freezing. The metal of the pipes of underground trunk pipelines during their operation in the areas of the distribution of heaving soils is subjected to significant deformations due to uncontrolled movements of the soil because of frost heaving. This force interaction of the underground pipeline and frozen ground can cause emergency situations. The main aim of the research is to create a 3D model of the interaction of the pipeline with frozen heaving soil in order to simulate soil heaving and to reveal graphs of the dependence of soil movement on stresses and strains that occur in the pipeline. Objects: section of the pipeline buried in the areas of distribution of heaving soils. Methods. The literature and regulatory documents on the construction and operation of structures in permafrost soils were studied and the influence of heaving soils on buildings and structures was analyzed, as well as modeling in the Ansys software package was carried out. The paper analyzes the interaction of permafrost soils with an underground pipeline in the AnsysWorkbench software package. Results. The authors have modeled the process of soil heaving and evaluated the stress-strain state of the pipeline buried in the areas of the distribution of heaving soils in the AnsysWorkbench software package using digital twin technology. With the help of the developed model, the values of stresses and total deformations of the pipe wall in contact with frozen soil are obtained and analyzed, and a graphical dependence of the observed values is constructed with an increase in the heaving process and an increase in the heaving area.