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- Title
NUMERICAL ANALYSIS OF TEMPERATURE FIELDS AROUND THE BURIED ARCTIC GAS PIPE-LINE IN PERMAFROST REGIONS.
- Authors
Xinze LI; Huijun JIN; Yanjing WEI; Zhi WEN; Yan LI; Xinyu LI
- Abstract
Based on one planned arctic natural gas pipe-line engineering which will cross continuous, discontinuous, sporadic and non-permafrost areas from north to south, with different pipe-line temperatures set, a thermal model of the interaction between pipe-line and permafrost is established to investigate the influence of pipe-lines on the freezing and thawing of frozen soil around pipe-line and thermal stability of permafrost. The results show that different pipe-line temperatures influence the permafrost table greatly. Especially in discontinuous permafrost areas the permafrost table is influenced in both positive temperature and negative temperature. The warm gas pipe-line of 5? could decrease the value of permafrost table about 1 to 3 times pipe diameter and aggravate the degradation of permafrost around pipe-line; -1? and -5? chilled gas pipe-line can effectively improve the permafrost table and maintain the temperature stability of frozen soil, but the temperature of soils below pipe-line of -5? decreases obviously, which may lead to frost heave hazards. In terms of thermal stability around pipe-line, it is advised that transporting temperature of -1? is adopted in continuous permafrost area; in discontinuous permafrost area pipe-line could operate above freezing in the summer months with the station discharge temperature trending the ambient air temperature, but the discharge temperature must be maintained as -1? throughout the winter months; in seasonal freezing soil area chilled pipe-line may cause frost heave, therefore, pipe-line should run in positive temperature without extra temperature cooling control.
- Subjects
FREEZE-thaw cycles; PERMAFROST; SOIL temperature; NUMERICAL analysis; TEMPERATURE control; ATMOSPHERIC temperature; SOIL freezing; TUNDRAS
- Publication
Thermal Science, 2021, Vol 25, Issue 2A, p869
- ISSN
0354-9836
- Publication type
Article
- DOI
10.2298/TSCI200521248L