静载作用下埋地管道数值模拟及其力学性能分析  

Numerical Simulation and Mechanical Performance Analysis of Buried Pipes Subjected to Static Load

作　　者：肖成志 王嘉勇[1] 杨爱克 XIAO Chengzhi;WANG Jiayong;YANG Aike(School of Civil and Transportation Engineering of Hebei University of Technology,Tianjin 300401 ,China;Technology and Research Center of Civil Engineering of Hebei Province, Hebei University of Technology, Tianjin 800401 ,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]河北工业大学河北省土木工程技术研究中心,天津300401

出　　处：《防灾减灾工程学报》2018年第1期22-29,167,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然基金项目(50909032);河北省自然基金项目(E2014202038);河北省研究生创新项目(CXZZSS2017027)资助

摘　　要：针对静载作用下埋地管道变形与力学性能,通过有限元数值模拟与模型试验对比分析,验证了有限元数值方法可靠性,进而综合分析了管周砂土相对密实度Dr、加载板宽度B、加载板中心距管道中心水平距离L、管道埋深H和管壁厚度t等因素对管道性能的影响。结果表明：增加Dr,管道正上方加载板极限承载力显著增加,相同荷载下管道应变和径向变形相应减小,管道应变以环向压应变为主;同等条件下随着B的增加,加载板极限承载力呈近似线性增加,管道径向变形和应变增长速率明显增加;随着管道埋深H增加,管道正上方加载板极限承载力先增加后减少,并最终趋于稳定,当埋深为3 D时管顶处竖向应力约为无管道时的50%,管顶土拱效应明显;当增加L时加载对管道径向变形和应变的影响持续减弱,二者沿管周的分布规律明显变化;增加管壁厚度可有效抑制管道环向应变,但对管道径向变形和加载板极限承载力无明显影响。Mechanical and deformation performance of buried pipes subjected to static loads was investigated through finite element method（FEM）.The numerical results were verified by published experimental results from model tests,and then the effects of relative density（Dr）,width of load plate（B）,location of load plate（L）,buried depth（H）and wall thickness of pipes（t）on the performance of buried pipes were studied comprehensively.The numerical results showed that limit bearing capacity of load plate above buried pipe remarkably increases with increase of relative density,and radial deformation and strains of pipe decrease under the same loading level;circumferential compression strains constitute a major part of pipe strains.With increase of width of load plate,the limit bearing capacity of load plate above buried pipe increases linearly and radial deformation and strains in pipes increase significantly.By increasing the buried depth continually,the limit bearing capacity of load plate above buried pipe increases firstly and then decreases,and it lastly tends to be steady.For the buried depth of 3 D,the vertical earth pressure at the top of pipe is about half of that without pipes,witch indicates that there is remarkable soil arching effect above pipes.Increasing the horizontal distance from center of load plate to circle point of pipes doesn＇t affect greatly the radial deformation and strain in pipes,but the distribution of radial deformation and strains along pipes varies with buried depth.Additionally,increasing wall thickness of pipes,which doesn＇t result in great change of radial deformation and limit bearing capacity of load plate above buried pipe,is helpful for reducing hoop strains.

关 键 词：埋地管道 有限元 模型试验 力学性能 静载 

分 类 号：TU443[建筑科学—岩土工程]