摘要
钢带增强聚乙烯螺旋波纹管(简称钢带增强PE管)结合了高密度聚乙烯和钢的优点,获得了良好的耐腐蚀性能和较高的承载能力.为明确其施工回填过程结构受力特性及其影响因素,采用等效模量法(Equivalent Modulus Method,EMM)对管壁截面进行等效,采用有限元软件Abaqus对管体进行数值模拟,采用附加荷载法对管涵的回填施工过程进行数值模拟,并通过试验验证了有限元模型的有效性,研究了沟槽宽度、压实压力大小和回填土摩擦角对钢带增强PE管涵回填施工过程中受力性能的影响.计算结果表明:管道在回填过程中的水平相对变形值均大于竖向相对变形值,峰值挠度随沟槽宽度和压实压力的增大而增大,回填材料摩擦角对管道变形的影响不显著;管涵顶部竖向土拱率均大于1.0,说明管涵在回填施工过程中为负土拱效应;回填施工过程中最大弯矩的位置和大小随回填高度的变化而变化,最大弯矩在回填至距管底0.75~1倍管涵直径之间.
Metal reinforced polyethylene spirally corrugated pipe has the advantages of both highdensity polyethylene and steel, obtaining high corrosion resistance and load capacity. Aiming to demonstrate the mechanical performance of the metal reinforced polyethylene spirally corrugated pipe culvert during backfilling and its influencing factors, this study, through the Equivalent Modulus Method(EMM), establishes the equivalent of the pipe wall cross section. The finite element software Abaqus is used to numerically simulate the pipe body, and the additional load method is used to numerically simulate the backfilling process of the pipe culvert. And the validity of the finite element model is verified through tests. Then, the influences of trench width, compaction pressure, and friction angle of backfilling soil on the mechanical properties of metal reinforced polyethylene spirally corrugated pipe culverts during backfilling are studied. The results show that the horizontal relative deformation value of the pipe is larger than the vertical relative deformation value during the backfilling process. The peak deflection increases with the increase of trench width and compaction pressure, and the friction angle of backfilling material has no significant effect on the pipe deformation The vertical arch of the top of the pipe culvert is greater than 1.0, indicating that the pipe culvert has a negative soil arching effect during the backfilling. The position and size of the maximum bending moment during the backfilling process change with the backfilling height, and the maximum bending moment is between 0.75~1 times the diameter of the pipe culvert from the bottom of the pipe after backfilling.
作者
刘保东
董寒林
范渊博
黄学伟
田子瀚
LIU Baodong;DONG Hanlin;FAN Yuanbo;HUANG Xuewei;TIAN Zihan(School of Civil Engineering,Beijing Jiaotong University,Beijing 10044,China;Highway Engineering Construc-tion Management Office,North Yinen to Lujing section of National Highway 331,Left Banner of Alxa League Inner Mongolia 750306,China)
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2022年第4期121-130,共10页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
内蒙古自治区交通运输厅科技项目(NJ-2018-17)
北京市自然科基金(8192035)。
关键词
涵洞工程
钢带增强聚乙烯螺旋波纹管
回填压实
等效模量法
土压力
culvert engineering
metal reinforced polyethylene spirally corrugated pipe
backfilling and compaction
equivalent modulus method
soil pressure
