摘要
埋地压力管道在敷设方向改变处,由于液体压力引起的推力一般与曲管段侧向抗力、直管段侧向土壤抗力和轴向摩擦力等三种抗力相互平衡。本文基于欧拉-伯努利梁理论和温克尔地基梁模型,以带刚性接口的、水平转向的埋地压力管道为研究对象,推导出在上述抗力同时作用的情况下直管段有效约束长度的解析解。对比研究了是否考虑曲管段范围土的侧向刚度对管道的内力、位移的影响,分析了管-土摩擦系数、敷设方向改变角度、直管段土侧向刚度、曲管段侧向约束等因素对管道有效约束长度、弯矩、轴向力和剪力的影响。本文推导的解析解可以根据直管和曲管侧向约束更合理地计算管道有效约束长度。
In locations where the laying direction of underground pressure pipelines changes,the thrust in-duced by liquid pressure is generally balanced with three types of resistance:lateral resistance of the curved pipe segments,lateral soil resistance of the straight pipe segments,and axial frictional resistance.In this paper,the horizontally redirected underground pressure pipelines with rigid interfaces are studied considering the simul-taneous influence of the three aforementioned resistances.Based on the Euler-Bernoulli beam theory and the Winkler foundation model,analytical solutions for the effective restraint length of the straight pipe segment are obtained.A comparative study is conducted on whether considering the influence of lateral stiffness of soil in the curved pipe segment on the stress and displacement of the pipeline.The effects of various factors including the pipe-soil friction coefficient,change in laying direction angle,Lateral stiffness of soil in straight pipe segments,and lateral constraint of curved pipe segments on the effective restraint length,bending moment,axial force,and shear force of the pipeline are discussed.The analytical solution derived in this paper can more reasonably calculate the effective restraint length of the pipeline based on the lateral constraints of straight and curved pipe segments.
作者
郭巍
蒋杰
周晨
Guo Wei;Jiang Jie;Zhou Chen(Nanjing Municipal Design and Research Institute Co.,Ltd.,210018,China)
出处
《特种结构》
2024年第1期80-85,102,共7页
Special Structures
关键词
埋地压力管道
欧拉-伯努利梁理论
温克尔地基梁模型
有效约束长度
Underground pressure pipeline
Euler-Bernoulli beam theory
Winkler foundation beam model
Effective constraint length 80
