交通荷载作用下埋地管道的三维力学性状分析

Analysis on 3D mechanical characteristics of buried pipeline under traffic loading

针对埋地PE管道采用ANSYS商业软件建立了移动恒定荷载作用下三维力学模型,基于新建模型监测了行车荷载作用过程中埋地管道关键位置处竖向位移以及Mises应力的时程响应,分析了移动恒定荷载作用下车行道下方埋地柔性管道的力学性状以及不同结构层的力学性状.研究结果表明:(1)管道纵向上最大力学响应出现在行车荷载作用点正下方的管道顶部,任意横截面上,竖向位移以及Mises应力的最大值均位于管道顶部;(2)监测点与荷载作用点间距离越小,管道监测点处的力学响应越大;(3)管道纵向长度方向上管顶的竖向位移和Mises应力的最大值出现在道路两端,管道中间部位最大力学性状差别不大;(4)埋深较浅的结构层受移动荷载影响程度较大,随着埋深增加,受影响程度快速降低.

ANSYS commercial software is adopted to construct a 3D mechanical model to simulate deformation and stress state of buried PE pipes under traffic load.The time-procedure response of vertical displacement and Mises stress at the key position of buried pipes are monitored during the loading process based on the newly constructed model.The mechanical responses of buried pipes beneath the roadway and different structural layers are analyzed.These results indicate that:(1)The most obvious mechanical response along the longitudinal direction of pipes takes place at spots under load points.On arbitrary cross-section,the vertical displacement and Mises stress arrive at the maximum at the top of the pipe.(2)The smaller the distance between monitor points and load points,the greater the mechanical response at monitor points.(3)Maximum vertical displacement and Mises stress take place at the end of the pipe,and there is no distinct difference between mechanical characteristics of points in the middle part of the pipe.(4)Traveling constant loading has a great influence on the deformation of shallow buried structural layers,and an increase in burial depth leads to a decline in the degree of influence.