考虑管土耦合的机坪垂直管道应力分析

机坪输油管网供油是目前民用航空领域供油的主要方式之一.实际工程中,机坪管网垂直管道受混凝土道面移位作用容易产生变形甚至破坏.为了解机坪垂直管道变形乃至破坏的机理,通过ANSYS软件对多种规格和底部三通连接方式的机坪垂直管道进行了有限元分析,管道和填埋土层之间的相互作用采用P-y曲线法进行模拟.通过室内物理模型实验校核并调整了P-y曲线参数.研究表明,除底部三通外,填埋土层约束下垂直管道也出现了一个高应力区,应力分布状况只与填埋土层分布和混凝土道面移位量有关.最后通过现场案例分析,给出了管道破坏点位置,与现场检测结果相符.

STRESS ANALYSIS FOR APRON VERTICAL PIPES TAKING ACCOUNT OF PIPE-SOIL COUPLING INTERACTION

Kerosene supply through apron network is one of the major methods for civil aviation kerosene supply. In practical engineering, vertical pipes in apron network maybe deformed or even broken due to slippage of concrete pavement. In this work, for sake of studying the mechanism for vertical pipes deformation and damage, FEM analysis has been performed on apron vertical pipes with different norms and tee types, in which P-y curves has been applied to simulate interaction between pipe and soil. Parameters for P-y curves have been determined through indoor physical model tests. The results show that the section with high stress besides tee in the bottom came out as result of backfill soil. And the stress distribution on the vertical pipes is related to the backfill layer distribution and slippage of concrete pavement. At last, through analysis of certain field case, failure point is ascertained, which is in accordance with test result.