摘要
季节性冻土区埋地管道遇到的最常见问题是冻融循环引起的管道冻胀与融沉,不仅给管道带来附加应力与变形,而且在特定的条件下容易造成破坏,引起严重灾害。通过ABAQUS软件对跨断层埋地管道与土壤系统进行热力耦合数值模拟,建立冻融循环情况下管-土相互作用模型,分析断层两侧土壤性质相同与差异情况下管道应力分布规律。当断层两侧土质相同时,管道总应力与轴向应力在最高或最低温度下都接近于相同,但是当断层两侧土壤性质不同时,管道最大应力与最大轴向应力明显大于断层两侧土壤性质相同时的应力,且均出现在距离断层一定位置处。管道内部承压会导致相应的最大总应力和轴向应力增加,同时低温和高温时的最大应力差值变化规律改变。断层处埋地管道土壤回填时宜采用相同或者渐变的土质,否则应采取特殊的抗冻胀措施,对断层错动与断层两侧土壤性质差异同时出现时的管土作用机理与灾害预估需进一步研究。
The most common problems of buried pipelines in seasonal tundra are frost-heave and thaw-sink,which not only bring additional stress and deformation,but also cause serious damage under certain conditions.Thermal-mechanical coupling simulation for the pipeline-soil system was conducted by ABAQUS,and the pipe-soil interaction model under the condition of freezing and thawing was established.The stress distribution of the pipeline was analyzed for the same and different soil properties at both sides of the fault.When the same,the total stress and axial stress of the pipeline's everywhere are nearly same at the highest or lowest soil surface temperature.However,when different,the maximum total stress and axial stress of the pipeline are significantly larger than those under the same soil condition,and appear at a certain distance from the fault.The internal pressure of the pipeline increase the maximum total stress and axial stress,and the maximum-stress difference values between low and high temperatures change.The backfill should be of same or gradually changing properties at the fault,otherwise,special antifreeze measures should be adopted.The mechanism of soil-pipe interaction and disaster prediction,when fault action and soil property differences take place on the same time,should be studied further.
作者
薛景宏
王香
董孝曜
XUE Jinghong;WANG Xiang;DONG Xiaoyao(School of Civil and Architectural Engineering,Northeast Petroleum University,Daqing 163318,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)
出处
《自然灾害学报》
CSCD
北大核心
2020年第3期138-144,共7页
Journal of Natural Disasters
基金
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(2020D25)
国家自然科学基金项目(51178087)。
关键词
跨断层埋地管道
差异性土壤
冻胀与融沉
温度场
力学性能
buried pipelines across faults
different soils properties
frost heave and thaw sink
temperature field
mechanical properties
