期刊
COMPUTERS AND GEOTECHNICS
卷 137, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2021.104155
关键词
Uplift; Finite element; Rate effects; Upheaval buckling; Buried pipeline; Clay
This study investigates the uplift behavior of a pipe segment in modified Cam clay soil, focusing on the role of rate effects on pipe uplift capacity. The results indicate a significant impact of loading rate on peak uplift resistances and suggest that excess pore pressures may not be a reliable indicator of overall response behavior. A new approach for predicting pipe uplift capacity as a function of loading rate is proposed as an alternative to current design guidelines.
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.
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