Abstract
A gap formation underneath pipelines could be observed during tunneling beneath existing buried pipelines, thus altering the pipeline-soil interaction behavior. However, the most existing analytical approaches typically do a full contact assumption for brevity. For such purpose, we aim to present an analytical approach coupling the effect of gap formation underneath pipelines by considering the buried pipeline as an Euler-Bernoulli beam on tensionless foundation. The pipeline can be divided into three segments according to pipeline-soil interaction behavior, and then the bending behaviors of each segment are formulated. The deflection and bending moment of the pipeline caused by tunnelling underneath from the proposed approach are compared and validated with centrifuge testing data and existing analytical solutions. The effects of pipeline-soil stiffness ratio, pipeline buried depth, tunnel buried depth, tunneling induced volume loss, and tunnel-pipeline intersection angle on the pipeline responses are further discussed. The results indicate that gap formation underneath pipeline can be observed indeed for shallowly buried pipeline and/or larger pipeline-soil stiffness ratio. The proposed analytical approach provides a theoretical guideline to predict the responses of existing pipelines to tunnelling underneath.
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Acknowledgments
This study is financially supported by the National Natural Science Foundation of China (42177121), Natural Science Foundation of Fujian province (2020J01882), Plan project of Fuzhou Science and Technology Bureau (2019-G-38), and Development Fund Project of Fujian university of Technology (GY-Z18170).
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Zhang, Bq., Chen, Qw., Lai, Fw. et al. Responses of Buried Pipelines to Tunnelling Underneath Considering Effect of Gap Formation: An Analytical Approach. KSCE J Civ Eng 28, 386–395 (2024). https://doi.org/10.1007/s12205-023-0177-y
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DOI: https://doi.org/10.1007/s12205-023-0177-y