中国石油大学学报（自然科学版）2011，Vol.35Issue(3)：108-114,7.DOI:10.3969/j.issn.1673-5005.2011.03.022
永冻区埋地管道周围土壤水热力耦合数值计算
Numerical calculation for temperature coupled with moisture and stress of soil around buried pipeline in permafrost regions
摘要
Abstract
Based on the construction characteristics of Sino-Russian crude oil pipeline permafrost regions project, a mathematical model of porous medium coupling of moisture-heat of the frozen soil was established.The periodic boundary conditions were adopted for obtaining the ambient temperature and SIMPLER method was used for numerical simulation.The relationship between the cyclic swing of the ambient temperature and the rule of soil temperature, moisture field and ice phase change interface movement was obtained since the late April of the first year when the pipeline was put into operation.The frost heave stress with the field of temperature coupled with moisture was analyzed by the software ANSYS.The results show that the soil temperature around the pipeline changes dramatically in a long period due to the periodic fluctuations of earth' s surface temperature.Top-down free convection of the moisture contained in the soil is generated along the center line of the pipeline by the effect of temperature difference and gravity.The modality and intensity in the vortex center of the free convection change significantly with the underground soil temperature changing, and water translocation can be easily impacted by the temperature gradient.At the same time, as the rise of the surface temperature, the thawing rate of soil above pipe is slightly larger than that of the pipe.As the melting cycle expands, the soil around pipe impacted by the small stress range is prone to form heterogeneous frost heaving.关键词
永冻土/埋地管道/多孔介质/水热力耦合/数值计算Key words
permafrost/ buried pipelines/ porous medium/ temperature coupled with moisture and stress/ numerical calculation分类
能源科技引用本文复制引用
马贵阳,杜明俊,李丹..永冻区埋地管道周围土壤水热力耦合数值计算[J].中国石油大学学报（自然科学版）,2011,35(3):108-114,7.基金项目
辽宁省自然科学基金项目(20082186) （20082186）
辽宁省高校重点实验室项目(LS2010097) （LS2010097）
