摘要
为研究冲击荷载作用下埋地长输管道的受力性能,制作一个土箱—管道缩尺模型,进行落锤冲击试验,并建立落锤冲击埋地管道的有限元计算模型,对管道动态响应过程进行数值模拟。主要分析了管道壁厚、管径、埋深和冲击能量等参数对管道受力性能的影响,探讨埋地长输管道在冲击荷载作用下的整体变形特点和应变分布规律。研究结果表明:在冲击荷载作用下,冲击能量增加,管道跨中表面的应变峰值增大;相同工况下大管径和薄壁管道应变值大,管道覆土越深,管道应变峰值越小,土体的缓冲作用削弱了管道受到的冲击作用;通过有限元模拟结果与试验结果对比分析,两者一致性较好,故在实际工况下可用有限元模拟落石对埋地管道的冲击作用。
To study the stress performance of buried long distance pipeline under the impact of rockfall,a drop hammer impact test is carried out by a scale combination model of soil box and pipeline.And the dynamic response process of the pipeline is simulated by establishing the finite element calculation model of the buried pipeline with falling hammer impacts.The influences of parameters such as pipe wall thickness,pipe diameter,buried depth and impact energy on the mechanical behavior of the pipeline are analyzed,and the overall deformation characteristics and strain distribution of the buried long-distance pipeline under impact loading are discussed.The results show that the peak strain of the midsoan surface of the pipe increases with the increase of the impact energy in the impact loading area,and the peak strains for the large-diameter and thin-walled pipelines change greatly under the same working conditions.The deeper soil covering for the pipeline will result in the smaller strains of the pipeline,and the cushioning effect of the soil weakens the impact on the pipeline.By comparing the results of the finite element simulation with the test results,the good consistency between the two is observed.Therefore,the impact of rockfall on buried pipelines can be well simulated by finite element method under actual working conditions.
作者
董飞飞
曾磊
谢向东
杜国锋
DONG Fei-fei;ZENG Lei;XIE Xiang-dong;DU Guo-feng(School of Urban Constructure,Yangtze University,Jingzhou 434000,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2019年第3期776-785,共10页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(51778064)
湖北省自然科学基金资助项目(创新群体)(2016CFA022)
中国石油科技创新基金资助项目(2016D-5007-0605)
关键词
冲击荷载
埋地长输管道
数值模拟
落锤试验
受力性能
impact load
long distance pipeline
numerical simulation
drop hammer impact test
mechanical performances.
