Abstract
The most important problems encountered in the design and operation of oil pipelines in permafrost regions are frost heaving and thawing settlement. In this paper, we conducted an investigation and analysis on the status of freezing damage of the operating oil pipelines. Based on the investigation and research, we calculated the temperature field of the oil pipeline and analysed the thawing ability under the conditions of the strain criterion. Finally, we proposed a design method for pipeline insulation and the maximum amount of thawing displacement that the pipeline can withstand. It has certain guiding significance for the thermal insulation design of oil pipelines in permafrost regions.
Highlights
The most important problems encountered in the design and operation of oil pipelines in permafrost regions are frost heaving and thawing settlement[1-10]
Due to the differences in geological conditions, the types of frozen soil, and the differences in topography and geomorphology, the freezing and thawing process of the soil around the pipeline has obvious inhomogeneities, which determines the differences in soil frost heave and thawing settlement[26-36]
It is necessary to carry out thermal insulation research on oil pipelines in permafrost regions to guide practical engineering applications
Summary
The most important problems encountered in the design and operation of oil pipelines in permafrost regions are frost heaving and thawing settlement[1-10]. The design and construction of oil pipelines in permafrost regions has its own particularities. The operation of the oil pipeline has a huge impact on the hydrothermal conditions of frozen rock and soil around and along the line[11-25]. The change of the hydrothermal state of frozen and thawed soil directly affects its physical and mechanical characteristics and threatens the overall stability and structural integrity of the pipeline. Due to the differences in geological conditions, the types of frozen soil, and the differences in topography and geomorphology, the freezing and thawing process of the soil around the pipeline has obvious inhomogeneities, which determines the differences in soil frost heave and thawing settlement[26-36]. It is necessary to carry out thermal insulation research on oil pipelines in permafrost regions to guide practical engineering applications
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