Yang Chunsheng, Li Shanqing
MOE Key Laboratory of Disaster Forecast and Control in Engineering, School of Mechanics and Construction Engineering, Jinan University, Guangzhou, China.
Heliyon. 2021 Jul 6;7(7):e07480. doi: 10.1016/j.heliyon.2021.e07480. eCollection 2021 Jul.
A mechanical analysis model for the floating of buried pipelines in soil liquefaction areas is established in this paper. In order to improve the inherent defects of the elastic foundation beam method based on the Winkler model and increase the calculation accuracy, the Pasternak model is introduced and the interaction between soil and spring is considered. A mechanical analysis method for buried pipelines in liquefaction zone considering axial load is proposed in present paper. According to the Pasternak model and the deflection curve differential equation, the pipe bending deformation curve equation and the deformation coordination equation are derived. The analytical calculation method of the pipe mechanical response is established. A new method of the mechanical analysis of the floating of buried pipelines in the liquefaction zone is provided. The mechanical response of the pipeline under the conditions of different pipeline parameters and liquefaction zone length is analyzed. The reliability of the analysis method in this paper is verified by the comparison of finite element method (FEM). Considering that the previous researches of scholars mainly focused on straight pipes, there are few studies on the pipe structure nodes in liquefied soil. The mechanical properties of the three-way pipe structure in the soil liquefaction zone are analyzed by the finite element method (FEM). The influence of pipe diameter, wall thickness, liquefied soil density, transition zone length, buried depth, and pipeline internal pressure on the mechanical response of the pipeline is analyzed.
本文建立了土液化区埋地管道上浮的力学分析模型。为改善基于文克勒模型的弹性地基梁法的固有缺陷，提高计算精度，引入帕斯特纳克模型并考虑土与弹簧间的相互作用。本文提出了考虑轴向荷载的液化区埋地管道力学分析方法。依据帕斯特纳克模型及挠度曲线微分方程，推导了管道弯曲变形曲线方程及变形协调方程，建立了管道力学响应的解析计算方法，提供了一种液化区埋地管道上浮力学分析的新方法。分析了不同管道参数及液化区长度条件下管道的力学响应，通过与有限元法（FEM）对比验证了本文分析方法的可靠性。考虑到以往学者研究主要集中在直管，对液化土中管道结构节点研究较少，采用有限元法（FEM）分析了土液化区三通管道结构的力学性能，分析了管径、壁厚、液化土密度、过渡区长度、埋深及管道内压对管道力学响应的影响。
