Application of Computer Modeling for the Accident Rate Assessment on Separate Sites of the Mohe–Daqing Oil Pipeline in Permafrost Conditions

Kovshov, Stanislav; Tingnting, Sun

doi:10.1007/s40515-020-00109-8

Cited by 6 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The paper shows that heat transfer by convection can have a significant effect on permafrost thawing in the presence of heat sources. Implementation of numerical simulation in software systems such as COMSOL [20,43] or ANSYS [44] opens up wide opportunities for modeling thermal processes in the "pile foundationsoil" system and developing new technical devices for soil thermal stabilization. These capabilities are usually not available in highly specialized programs for calculating the thermal stabilization of soils, designed mainly for the calculation of ventilated basements, the configuration of thermosiphons, etc.…”

Section: Figure 9 the Concept Of Modular Pile Structures For The Arcticmentioning

confidence: 99%

Thermal Stabilization of Permafrost Using Thermal Coils Inside Foundation Piles

2023

View full text Add to dashboard Cite

The article deals with the issue of thermal stabilization of soils to preserve the stability of pile foundations in permafrost conditions. The purpose of the work is to develop a technology for year-round freezing of soils by supplying coolant cooled by a refrigeration machine to thermal elements placed inside piles. In this work, the temperature regime of the system "pile foundation – soil" in the stationary formulation of the problem was simulated, and the influence of the depth of placement of thermal elements inside the piles on the soil temperature was investigated. The simulation was performed in the COMSOL software environment, taking into account the heat transfer due to thermal conduction and convection. In the presented model, a platform is fixed on piles, and a heat source is placed on the platform. It is found that an area of thawed soil has formed on the leeward side of the pile foundation. It is concluded that, under certain conditions, deep thermal elements for freezing or keeping the soil frozen should be placed at different depths. Thus, under given conditions, a greater depth of the thermal element placement in the pile, closest to the soil thawing zone, allows to reduce the surface temperature of the pile below ground level and, therefore, increase its bearing capacity. The authors also propose an original unit for soil thermostabilization based on the absorption cooling machine, which can operate at the expense of thermal energy generated by technological sources located on the platform. Doi: 10.28991/CEJ-2023-09-04-013 Full Text: PDF

show abstract

Section: Figure 9 the Concept Of Modular Pile Structures For The Arcticmentioning

confidence: 99%

Thermal Stabilization of Permafrost Using Thermal Coils Inside Foundation Piles

2023

View full text Add to dashboard Cite

show abstract

“…To determine the dependence of the elastic stresses in the pipe body on the magnitude of the sharp displacement of the pipeline ends when cutting out the defective section, we use the finite element method, which consists in subdividing the model into the set of elements, apply forces and restrictions to them to implement the selected case of loading the pipeline, whereby solving systems of equations describing the interaction of model elements. [32][33][34][35][36][37] It is also necessary to investigate the influence of elastic stresses in the body of the pipeline on the displacement of its ends during cutting, depending on the geometric parameters of the pipeline. For this, modeling will be carried out for pipelines with two different geometric characteristics.…”

Section: Problem Statementmentioning

confidence: 99%

Research of the Dependence of the Pipeline Ends Displacement Value When Cutting Out Its Defective Section on the Elastic Stresses in the Pipe Body

Shammazov

Sidorkin

Dzhemilev

2022

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

In the process of repairing main oil and gas pipelines with cutting out defective sections, due to the elastic stresses in the body of the pipeline at the end of the first cut, there is a sharp displacement of the pipeline ends on both sides of the cutting site. This sharp displacement poses a threat to the lives of workers, and also complicates the further process of welding a new section of the pipeline due to the need to center its ends relative to each other. At the same time, to reduce the displacement of the ends of the pipeline, it is often pressed down with an excavator bucket before cutting, which contradicts the safety rules for conducting repair work. This article examines the dependence of the displacement value of the ends of the pipeline on the existing elastic stresses in it in order to substantiate the need to take into account the elastic stresses in the body of the pipeline in the used repair methods, as well as the need to develop safe and technologically efficient equipment for fixing the position of the pipeline before cutting and further centering its ends relative to each other.

show abstract

“…Effectively training and using machine classifiers in geospatial data analysis faces a number of challenges that need to be solved. The most important ones include: the need to solve problems of deep models training in conditions of a deficit of labeled data; overcoming the problem of intrinsic complexity of images obtained from remote sensing data (RSD), as well as determining model hyper parameters when analyzing complex spatial data [5]- [7]. Deep models are capable of learning more features, but they are highly susceptible to retraining problem [8]- [10].…”

Section: Related Workmentioning

confidence: 99%

Development of the regional water balance regulation concept based on the geosystem approach

Yamashkin

Radovanović²,

Muchkaeva³

et al. 2022

IJEECS

View full text Add to dashboard Cite

The article is devoted to solving the scientific problem of the regional water balance regulation concept development. The authors have proposed a methodology for solving the problem of the scarcity of labeled spatial data, based on the geosystem approach. A deep neural network model for the analysis of the geosystem model of the territory is proposed. An approach to the formation of ensembles of classifiers to improve the accuracy of the classification of spatial data is described. It is proved that the hierarchical structuring of geosystems optimizes diagnostics of the leading agents of physical and geographical factors interaction, patterns of spatio-temporal changes in their states, direction of metabolic processes and transformation of matter and energy development. Studies have shown that the combination of factors variety in the water balance formation forms many types of water resources conditions formation.

show abstract

Application of Computer Modeling for the Accident Rate Assessment on Separate Sites of the Mohe–Daqing Oil Pipeline in Permafrost Conditions

Cited by 6 publications

References 8 publications

Thermal Stabilization of Permafrost Using Thermal Coils Inside Foundation Piles

Thermal Stabilization of Permafrost Using Thermal Coils Inside Foundation Piles

Research of the Dependence of the Pipeline Ends Displacement Value When Cutting Out Its Defective Section on the Elastic Stresses in the Pipe Body

Development of the regional water balance regulation concept based on the geosystem approach

Contact Info

Product

Resources

About