Lateral and Upward Soil-Pipeline Interactions in Sand for Deep Embedment Conditions |
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Authors: | S Yimsiri K Soga K Yoshizaki G R Dasari T D O’Rourke |
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Affiliation: | 1Lecturer, Dept. of Civil Engineering, Burapha Univ., Saensook, Muang, Chonburi 20131, Thailand. 2Reader, Engineering Dept., Cambridge Univ., Trumpington St., Cambridge, CB2 1PZ, UK. 3Pipeline Engineer, Pipeline Engineering Research Laboratory, Pipeline Technology Centre, Tokyo Gas Co., Ltd., 1-7-7, Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan. 4Senior Research Engineer, ExxonMobil Upstream Research Company, Houston, TX 77098. 5Thomas R. Briggs Professor of Engineering, School of Civil and Environmental Engineering, Cornell Univ., 273 Hollister Hall, Ithaca, NY 14853.
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Abstract: | The soil–pipeline interactions in sand under lateral and upward movements are investigated with particular attention to the peak forces exerted on the pipe. The analytical solutions for estimating the peak forces are summarized and it is shown that, for deep embedment condition, there is large uncertainty in the true values since the bounds established by the analytical solutions are large. In order to find the solution for the peak force and to investigate its transition from shallow to deep failure mechanism, finite element analyses of lateral and upward pipe movements are performed for different embedment conditions. Two different soil models (Mohr–Coulomb and Nor–Sand models) are used for the simulations. The accuracy of the analysis is first examined by simulating experimental tank tests. The analysis is further extended to deeper embedment ratios of as large as 100. The obtained finite element results are used to construct a design chart for deep embedded pipelines. |
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Keywords: | Sand Buried pipes Pipelines Embedment Ground motion Vertical movement |
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