Review Article

Stability of the Foundation of Buried Energy Pipeline in Permafrost Region

Table 2

Summary of the main experiments of the chilled and warm buried energy pipelines in permafrost regions.

No.Pipeline experiment
Reference
Model scaleTest timeOperation temperatureDiameter (mm)Length (m)Wall thickness (mm)Burial depth (m)Comments

1Calgary frost heave experiment [45, 118]Large-scale1974-10~-7°C12212.2100.7Buried in unfrozen soil with high frost susceptibility; with 15 mm insulation
2Caen frost heave test [48, 100]Large-scale1981Stage I: -2°C
Stage II: -5°C
2731850.33Half is located in unfrost susceptible sand and a half in frost susceptible silt
3Fairbanks frost heave experiment [7, 45, 119]Full-scale1999-10°C901058.51.8The first 30 m of the pipeline is in permafrost and the rest are in talik
4Inuvik pipeline experiment [120, 121]Large-scale197171°C610271.251.5Warm oil pipeline buried in ice-rich permafrost; operated for six months
5Small-scale pipeline experiment based on the CRCOP [122]Middle-scale2010-15~25°C1087.84.50.25Two parallel pipelines, one is insulated and the other is bare
6Centrifuge modeling of Calgary frost heave [123]Small-scale2002-10°C41.3 (test 1, 2)
22 (test 3)
0.71.590.25 (test 1)
0.57 (test 2)
Centrifuge acceleration: 30 g (test 1), 50 g (test 2), and 55 g (test 3)
Test time: 5.5 and 6.25 h
7Centrifuge model of warm oil pipeline [124]Small-scale2018Warm: 7°C
Cold: 2°C
11.10.270.25Air temperature: -16.83~19.7°C; oil temperature: 2~6°C; two warm pipelines were buried; centrifuge acceleration: 8 g