青藏高原多年冻土区埋地输气管道周围温度场数值分析

doi:10.7522/j.issn.1000-0240.2019.0326

冰川冻土 ›› 2019, Vol. 41 ›› Issue (5): 1078-1086.doi: 10.7522/j.issn.1000-0240.2019.0326

青藏高原多年冻土区埋地输气管道周围温度场数值分析

魏彦京^1,2, 温智^1,3, 高樯^1,2, 张明礼⁴, 施瑞^1,2, 孔森^1,2

1. 中国科学院西北生态环境资源研究院冻土工程国家重点实验室, 甘肃兰州 730000;
2. 中国科学院大学, 北京 100049;
3. 兰州交通大学土木工程学院, 甘肃兰州 730070;
4. 兰州理工大学土木工程学院, 甘肃兰州 730050

收稿日期:2019-07-03 修回日期:2019-09-25 发布日期:2020-02-24
通讯作者: 温智,E-mail:wenzhi@lzb.ac.cn. E-mail:wenzhi@lzb.ac.cn
作者简介:魏彦京(1992-),男,河北保定人,2016年在燕山大学获学士学位,现为中国科学院西北生态环境资源研究院在读硕士研究生,从事冻土与寒区工程研究.E-mail:weiyanjing17@mails.ucas.ac.cn
基金资助:
国家自然科学基金项目（41771073；41871061）；国家自然科学基金重大项目（41690144）；国家自然科学基金国际交流合作项目（41811530089）；冻土工程国家重点实验室自主课题（SKLFSE-ZT-22）资助

Numerical analysis of temperature fields around the buried gas pipeline in permafrost regions of Qinghai-Tibet Plateau

WEI Yanjing^1,2, WEN Zhi^1,3, GAO Qiang^1,2, ZHANG Mingli⁴, SHI Rui^1,2, KONG Sen^1,2

1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
4. College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Received:2019-07-03 Revised:2019-09-25 Published:2020-02-24

摘要/Abstract

摘要： 通过建立管道与多年冻土热相互作用的计算模型，利用数值分析方法探究了不同管温（输运温度）工况下冷输天然气管道对管周土体冻融过程和多年冻土热稳定性的影响。研究表明：5℃正温输运天然气管道可造成下覆冻土上限下降约11倍管径，管周多年冻土退化严重；0℃输运会导致管底下部高温不稳定冻土范围扩大，管底土体强度及承载性能降低，不利于保持多年冻土和管道运营稳定性；-1℃和-5℃负温输运可有效提高冻土人为上限，保持管底冻土温度稳定，但-5℃时管道下部土体温度降低明显，可能导致冻胀病害发生。就管周冻土热稳定性而言，在青藏高原多年冻土区采用冷输（负温输送）工艺输运天然气有利于保护管周多年冻土，是可行的。

关键词: 青藏高原, 多年冻土, 天然气管道, 冷输, 数值模拟

Abstract: In the paper, with different pipeline temperatures set, a thermal model of the interaction between pipeline and permafrost is established to investigate the influence of chilled pipelines on the freezing and thawing of soil around pipeline and thermal stability of permafrost. The results show that warm gas pipeline of 5℃ could decrease the value of permafrost table below pipeline about 11 times diameter and aggravate the degradation of permafrost around pipeline; gas pipeline of 0℃ will expand the range of high-temperature unstable permafrost below the pipeline, decreasing the strength and bearing capacity of frozen soil below the pipeline, which is not conducive to maintaining permafrost and pipeline operation stability; -1℃ and -5℃ chilled gas pipeline can effectively improve the permafrost table and maintain the temperature stability of frozen soil below pipeline, but the temperature of soils below pipeline of -5℃ decreases obviously, which may lead to frost heave of soil. In terms of thermal stability around pipeline, the chilled gas transmission technology can protect permafrost and can be applied to the gas pipeline construction in permafrost region of Qinghai-Tibet Plateau.

Key words: Qinghai-Tibet Plateau, permafrost, natural gas pipeline, chilled, numerical simulation

中图分类号:

P642.14

魏彦京, 温智, 高樯, 张明礼, 施瑞, 孔森. 青藏高原多年冻土区埋地输气管道周围温度场数值分析[J]. 冰川冻土, 2019, 41(5): 1078-1086.

WEI Yanjing, WEN Zhi, GAO Qiang, ZHANG Mingli, SHI Rui, KONG Sen. Numerical analysis of temperature fields around the buried gas pipeline in permafrost regions of Qinghai-Tibet Plateau[J]. Journal of Glaciology and Geocryology, 2019, 41(5): 1078-1086.

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青藏高原多年冻土区埋地输气管道周围温度场数值分析

Numerical analysis of temperature fields around the buried gas pipeline in permafrost regions of Qinghai-Tibet Plateau

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