Building a patchy permafrost physical model

which is composed of multiple formations

the paper researches the effect of thermo-hydro-mechanical(T-H-M) coupling around the buried oil pipelines in Tahe on the base of considering the effect of environmental temperature and flow medium temperature in the pipelines

and analyses the stress of the buried pipelines and takes a strength calculation on the pipelines. The distribution of stress and sedigraph are acquired by the multiphysical fields coupling COMSOL Multiphysics software

which is used to simulate two kinds of working condition of T-H-M coupling and uncoupling. The numerical simulation results indicate that temperature

water phase transition and water migration influence the stress field greatly. What’s more

the coupling among the moisture field

the temperature field and the stress field is very remarkable. Because of temperature change

patchy permafrost takes on freezing or thawing

which results in stress concentration and settlement around the pipelines

so as to harm the safety of buried pipelines.