This paper describes a finite element study of the uplift behaviour of a plane strain pipe segment embedded in modified Cam clay soil. The primary aim of this study is to explore the role of rate effects on pipe uplift capacity and the transition between drained and undrained behaviour using coupled-consolidation analyses. The velocities considered in the modelling cover six orders of magnitude allowing a rigorous assessment of the effect of loading rate. The effects of pipe embedment depth, soil strength profile and pipe-soil interface roughness are also investigated. The results indicate that the range of uplift velocities for which the soil response can be considered ‘partially drained’, as determined from the peak uplift resistances, is significant and exceeds bounds established for full flow penetrometers previously reported in the literature. The data also suggests that excess pore pressures determined locally at the pipe-soil interface may not be a reliable means of determining whether the overall response is ‘drained’ or ‘undrained’. To address some limitations associated with design guidelines currently used by industry, a new approach for the prediction of pipe uplift capacity as a function of loading rate is proposed and applied to a hypothetical design scenario.

本文描述了嵌入在改良凸轮粘土中的平面应变管段的抬升行为的有限元研究。本研究的主要目的是使用耦合固结分析探索速率效应对管道提升能力的作用以及排水和不排水行为之间的转变。建模中考虑的速度涵盖六个数量级，允许对加载速率的影响进行严格评估。还研究了管道嵌入深度、土壤强度剖面和管道-土壤界面粗糙度的影响。结果表明，根据峰值隆起阻力确定的土壤响应可以被视为“部分排水”的隆起速度范围是显着的，并且超出了先前文献中报道的全流贯入仪确定的界限。数据还表明，在管土界面局部确定的超孔隙压力可能不是确定整体响应是“排水”还是“不排水”的可靠方法。为了解决与行业当前使用的设计指南相关的一些限制，提出了一种预测管道提升能力作为加载速率函数的新方法，并将其应用于假设的设计场景。