黄河口裸置管线在位稳定性数值模拟研究

基于Biot固结理论,并结合接触算法,考虑了海水流经管线时的尾流效应,建立了波浪荷载作用下裸置管线与周围土体相互作用的有限元模型,使计算结果更加符合实际情况。将此模型应用于黄河口埕岛油田裸置管线在位稳定性计算,分析了尾流效应对裸置管线稳定性的影响,在此基础上提出了适用于黄河口不同地质分区的裸置管线稳定性校核曲线。

裸露管线的沉排保护及其设计原理与设计方法

文章结合茂名30万吨级单点系泊的34"输油管线的工程实际,介绍裸露管线的沉排保护的基本形式,作用在沉排与管线体系的外载荷及其计算,沉排与管线体系的稳定性设计准则,沉排尺度的优化等实际工程应用密切关注的热点问题。

Study on Performances of Car-following Models Induced by Motions of a Leading Car

This paper investigated the performances of a well-known car-following model with numerical simulations in describing the deceleration process induced by the motion of a leading car. A leading car with a pre-specilied speed profile was used to test the above model. The results show that this model is to some extent deficient in performing the process aforementioned. Modifications of the model to overcome these deficiencies were demonstrated anda modified car-following model was proposed accordingly. Furthermore, the delay time of car motion of the new model were studied.