Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2021 , Vol. 55 >Issue 6: 652 - 662

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2020.007

Analytical Analysis of Influence of Dewatering on Adjacent Pipelines Based on Pasternak Foundation

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  • 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
    2. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
    3. Hangzhou Water Holding Group Co., Ltd., Hangzhou 310009, China
    4. Zhejiang Communications Investment Group Co., Ltd., Hangzhou 310000, China

Received date: 2020-01-03

  Online published: 2021-06-08

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Abstract

Based on the Pasternak model of elastic foundation beams, and combining the effective stress principle of soil and Dupuit hypothesis, the analytical solution of adjacent pipeline deformation in sandy soil caused by single well dewatering is derived. The example calculation results are in good agreement with the results of pumping test and numerical simulation, which verifies the applicability. The law of stress and deformation for the pipeline is studied by parameter analysis. The results show that the influence of soil shear stiffness should not be ignored in the study of soil-pipeline interaction and the pipeline deformation range is approximately equal to the influence radius of dewatering. Pipeline deformation and stress are greatly influenced by dewatering depth and the distance between the pipeline and the dewatering well. Before reaching the critical drawdown, the maximum value of pipeline deformation and bending moments are at the center of pipeline, increasing with the increase of dewatering depth. When the dewatering depth exceeds the critical drawdown, the maximum bending moment will shift outward from the center with the increase of the dewatering depth, resulting in two peak bending moments which are at the intersection of the water level line and at the pipeline. The research results can provide reference for pipeline protection in relevant projects.

Key words： single well dewatering; underground pipeline; Pasternak foundation model; pipeline deformation; stress analysis

Cite this article

XU Changjie, ZENG Yiting, TIAN Wei, CHEN Ming . Analytical Analysis of Influence of Dewatering on Adjacent Pipelines Based on Pasternak Foundation[J]. Journal of Shanghai Jiaotong University, 2021 , 55(6) : 652 -662 . DOI: 10.16183/j.cnki.jsjtu.2020.007

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