摘要
越坡体的埋地油气管道在地震作用下因可能的滑坡推力而使管体产生显著的力学响应。为合理计算地震滑坡推力致管体的内力与位移,根据拟静力模式,通过传递系数法计算管道后侧地震滑坡推力后,采用沿管道轴向两端小(滑坡周界附近)中间大的梯形推力分布模式,基于Winkler弹性地基上的考虑管体横向剪切变形的Timoshenko梁模型,建立了管道力学分析方法,推导出管道位移和内力的计算公式,给出了基于应力安全状态分析的管道选材计算方法。实例分析表明:管道挠度由滑坡周界至滑坡体内逐渐增大,穿越段中间部位挠度基本不变,管道中间1/3~2/3长度范围内的弯矩与剪力均很小,管道弯矩与剪力最大值均位于滑坡周界附近,理论计算与FLAC3D数值模拟结果基本一致;随着地震影响系数、管道穿过滑体的长度、管道横截面尺寸的变化,管道内力的分布模式基本不变;管道的最大弯矩与剪力则随水平地震影响系数呈非线性增大,随管道横截面尺寸的增大而有所增大,但随管道穿越段长度的增加则略有减小。
Petroleum pipelines across slopes can produce obvious mechanical responses to seismic landslide thrust.In order to rationally calculate internal forces and displacements of the pipeline due to the seismic landslide of the soil mass surrounding it,a mechanical analysis method of the pipeline is proposed based on the Timoshenko beam considering lateral shear deformation on the Winkler foundation with the normal trapezial earth pressure on it,in which the seismic earth pressure is determined using the transfer coefficient method combined with the pseudo-static method.The formulas of internal forces and displacement of the pipeline are accordingly derived,and the material determination approach is put forward according to the control of its safe stress state.Analysis results of an example show that the pipeline deflection increases with the distance to the slide mass boundary,and the maximum bending moment and shear force on the pipeline are nearly located in the boundary,which is consistent with that by the numerical simulation via FLAC3D.The distribution mode of the internal forces is not almost varied with seismic coefficients,pipeline length in the slide mass,and cross-section of the pipeline.However,the maximum bending moment and shear force are nonlinearly increasing with the horizontal seismic coefficient,slightly increasing with the cross-section,and marginally decreasing with the increase of the pipeline length in the slide mass.
作者
谢成
赵子震
刘军
肖世国
戴天毅
Xie Cheng;Zhao Zizhen;Liu Jun;Xiao Shiguo;Dai Tianyi(South China Branch of China National Pipe Group Co.,Ltd.,Guangzhou 510620,P.R.China;Key Laboratory of High-speed Railway Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,P.R China)
出处
《地下空间与工程学报》
北大核心
2025年第6期2148-2158,共11页
Chinese Journal of Underground Space and Engineering
基金
国家石油天然气管网集团有限公司科技项目(GWHT20210014429)
国家自然科学基金(51578466)。
关键词
油气管道
地震滑坡
拟静力法
弹性地基梁
内力
petroleum pipeline
seismic landslide
pseudo-static method
beam on elastic foundation
internal forces
