The ultimate undrained resistance of partially embedded pipelines
The ultimate undrained resistance of partially embedded pipelines
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DOI：
10.1680/geot.2007.00097
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发表时间：
2008-08
期刊：
影响因子：
5.8
通讯作者：
R. Merifield;D. White;M. Randolph
中科院分区：
文献类型：
--
作者：
R. Merifield;D. White;M. Randolph
深水油气输送管道在作业周期中会经历温度和压力的显著变化，从而导致横向屈曲的趋势。对这种现象进行预测和控制，是这些管道安全设计和运行的要求。然而，竖向和横向联合荷载作用下的土体响应是一个很大的不确定性领域，目前的实践依赖于经验表达式来估计横向管土阻力。本文报道了浅埋管道在竖向和水平荷载作用下的有限元分析结果。这些分析结果与使用塑性上限定理计算的倒塌荷载进行了比较，并用于构建定义竖向和水平荷载极限组合的屈服包络线。结果表明，有限元极限荷载与塑性上限解吻合较好，计算得到的土体内部位移与塑性上限解吻合较好。
On-bottom pipelines for transporting oil and gas in deep water undergo significant changes in temperature and pressure during operating cycles, which cause a tendency for lateral buckling. Prediction and control of this phenomenon are required for the safe design and operation of these pipelines. However, the soil response under combined vertical and lateral loading is a significant area of uncertainty, and current practice relies on empirical expressions for the estimation of lateral pipe–soil resistance. This paper reports the results of finite element (FE) analyses of shallowly embedded pipelines under vertical and horizontal load. These analyses have been compared with collapse loads calculated using the upper-bound theorem of plasticity, and are used to construct yield envelopes defining the limiting combinations of vertical and horizontal load. The FE limiting loads were found to compare well with upper-bound plasticity solutions, and the internal soil displacements calculated in the FE analyses mat...