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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Simulation analysis of loading process of buried pipeline based on discrete-continuous coupling method

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基于离散-连续耦合法的埋地管道受荷过程模拟分析

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jan.2023, Vol.46 No.1: 96-103

DOI: 10.3969/j.issn.1003-5060.2023.01.015

Authors

HOU Chaoqun, CHENG Yipeng, LI Yongxin, SUN Zhibin, JIANG Xiaowen

(School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: To represent the bearing and force transmission features of the surrounding soil of buried pipeline from the macro and meso view, the numerical model of discrete-continuous interface coupling is applied to simulating and analyzing the loading process of buried pipeline. The backfill around the buried pipeline is simulated by the discrete element method, and the buried pipeline and the undisturbed soil foundation are simulated by the finite difference element method. The results show that as the load or burial depth increases, the top of the pipeline is compressed and deformed. The soil on the top of the pipeline is subjected to the pressure arch effect, which causes a redistribution of soil pressure around the pipeline. The distribution of the horizontal displacement shows that the buried pipeline transfers the external loads between the backfill and the undisturbed soil foundation during the loading process. The distribution of the contact force chain of the soil around the pipeline has a good agreement with that of the soil pressure on the top of the pipeline.

Keywords: buried pipeline; discrete-continuous coupling method; contact force chain; discrete element

作者信息

侯超群，程一朋，李永鑫，孙志彬，蒋逍文

（合肥工业大学汽车与交通工程学院，安徽合肥230009）

摘要和关键词

摘要: 为了从宏、细观角度反映出埋地管道管周土体的承载特点,文章采用离散-连续界面耦合数值模型对埋地管道受荷过程进行模拟分析,其中管周填土采用离散单元法进行模拟,埋地管道及原状土基采用有限差分单元法进行模拟。结果表明:随着荷载或埋深的增大,管顶受压产生压缩变形,管顶土体发生“压力拱效应”,引起管周土压力重分布;耦合模型水平位移场显示埋地管道在受荷过程中管侧回填土及原状土基能够分担和转移外荷载;管周土体的细观接触力链分布形态与管顶土压力的分布规律形成相互印证。

关键词: 埋地管道；离散-连续耦合法；接触力链；离散元

Funding

国家自然科学基金资助项目(5210081105); 安徽省自然科学基金资助项目(2108085QE250)和中央高校基本科研业务费专项资金资助项目(JZ2021HGTA0160)

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