冻融循环作用下埋地输油管道应变试验研究  

Experimental Study on Strain of Buried Oil Pipeline under Freeze-thaw Cycles

作　　者：滕振超[1,2] 滕云超 赵誉翔 刘宇 刘晓燕[1,2] TENG Zhenchao;TENG Yunchao;ZHAO Yuxiang;LIU Yu;LIU Xiaoyan(School of Civil Engineering,Northeast Petroleum University,Daqing 163318,China;Key Laboratory of Disaster Prevention,Reduction and Protection Engineeringin Heilongjiang Province,Daqing 163318,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]东北石油大学土木建筑工程学院,黑龙江大庆163318 [2]黑龙江省高校防灾减灾与防护工程重点实验室,黑龙江大庆163318 [3]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150001

出　　处：《甘肃科学学报》2022年第3期78-82,共5页Journal of Gansu Sciences

基　　金：国家自然科学基金(51176024);中国地震局工程力学研究所基本科研业务费专项资助项目(2020007)。

摘　　要：为研究穿越季节性冻土区的埋地输油管道在季节交替过程产生的冻胀融沉现象,采用了室外冻结、室内融化模拟冻融循环的试验条件,进行了冻融循环作用下埋地输油管道的应变试验研究。通过1∶10的缩尺实验模型,分析了冻融温度上下限、循环周期、管道位置土体温度场、管道位置冻胀力等因素对管道240 h内应变变化的影响。结果显示:不同土层温度与土表温度变化趋势一致,符合温度正弦变化规律。随着冻融循环的进行,管道顶部底部均为增大的压应变,直到第8次循环压应变趋于平稳,这一现象与棘轮效应理论所述一致;冻胀力的数值模拟与实测规律一致,管道顶部冻胀力大于底部。研究可为进一步研究冻土-管道相互作用机理提供依据。In order to study the phenomenon of frost heaving and thawing settlement of buried oil pipeline crossing seasonal frozen soil area in the process of seasonal alternation,the experimental conditions of outdoor freezing and indoor thawing were used to simulate the freeze-thaw cycle.The strain test of buried oil pipeline under freeze-thaw cycles was carried out.Based on the 1∶10 scale experimental model,the influences of the upper and lower limits of freezing and thawing temperature,cycle period,soil temperature field and frost heaving stress on the internal strain of the pipeline in 240 h were analyzed.It is concluded that the temperature change accords with the law of sinusoidal temperature change.As the freeze-thaw cycle goes on,the compressive strain increases at the top and bottom of the pipe until the eighth cycle,which is consistent with the ratchet effect theory.The results show that the frost heaving force at the top of the pipeline is greater than that at the bottom,which provides a basis for further study on the mechanism of frozen soil pipeline interaction.

关 键 词：冻融循环 季节冻土区 埋地输油管道 冻胀力 

分 类 号：TE42[石油与天然气工程—油气田开发工程]