地震波作用下埋地管道截面应力偏移效应研究  

Stress offset effect of cross section for buried pipe under seismic wav

作　　者：张杰[1,2] 蒋文杰 陈阳 胡特 杨锐 曾云 ZHANG Jie;JIANG Wen-jie;CHEN Yang;HU Te;YANG Rui;ZENG Yun(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;Oil and Gas Equipment Technology Sharing and Service Platform of Sichuan Province,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]石油天然气装备技术四川省科技资源共享服务平台,成都610500

出　　处：《计算力学学报》2023年第3期389-394,共6页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(52104223);中国博士后科学基金(2019M653839XB);四川省博士后特别资助项目.

摘　　要：PE管广泛应用于城镇燃气、水和浆体等输送领域,地震灾害下埋地管道易发生失效.为此,提出了一种地震波作用下埋地PE管G土耦合数值建模方法,研究PE管力学特性,探究管道内压、地震烈度、围土和覆土厚度等对其力学响应影响规律.结果表明,地震波作用下管道截面应力出现偏移效应,而非0°,90°,180°和270°位置;内压作用下管壁应力增加;管道环向应力随着地震烈度增加而增大,且应力偏移效应更加显著.研究结果可为PE管道敷设和安全评价等提供理论依据.PE pipes are widely used in transportation of matters such as urban gas,water and supply.A pipe is prone to failure in an earthquake disaster.A numerical model for PE pipe-soil coupling was established in this paper.Mechanical characteristics of the buried PE pipe under the action of seismic waves were studied.Effects of internal pressure,seismic intensity,surrounding soil types and covering soil height on its mechanical responses were discussed.The results show that stress offset effect appears on the pipe section,the maximum stress is not at 0 °,90 °,180 ° or 270 °.The initial stress of the pipe wall is increased under internal pressure.The pipe hoop stress increases with the seismic intensity.The “offset effect” is more obvious with the increase of seismic intensity.These results can provide a theoretical bases for the laying and safety evaluation of PE pipes.

关 键 词：PE管 地震波 应力 偏移效应 

分 类 号：TH49[机械工程—机械制造及自动化] O241[理学—计算数学]