Experimental study on interaction mechanism between pipeline seepage erosion and adjacent foundation pile

Seepage erosion in the water-rich sandy strata, induced by the broken subsurface pipeline, has considerably complex interactions with the adjacent foundation pile. In order to investigate their interaction mechanism, six physical model tests considering different relative positions of pile are carri...

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Bibliographic Details
Published in:Acta geotechnica 2024-04, Vol.19 (4), p.1745-1763
Main Authors: Zhang, Dong-Mei, Zhang, Xue-Liang, Du, Wei-Wei
Format: Article
Language:English
Subjects:
Bearing capacity
Boundary conditions
Civil engineering
Complex Fluids and Microfluidics
Deformation
Earth pressure
Engineering
Foundations
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Influence
Numerical models
Partial differential equations
Pile bearing capacities
Piles
Research Paper
Scale models
Seepage
Soft and Granular Matter
Soil erosion
Soil layers
Soil Science & Conservation
Soil strength
Solid Mechanics
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Summary:Seepage erosion in the water-rich sandy strata, induced by the broken subsurface pipeline, has considerably complex interactions with the adjacent foundation pile. In order to investigate their interaction mechanism, six physical model tests considering different relative positions of pile are carried out in this study. By observing and measuring the variation of eroded form of soil layers, sand loss quantity and soil strength, the blocking effect and local intensification effect of foundation pile on seepage erosion are analyzed quantitatively and intuitively. And it’s found that when the foundation pile is closer to the loss hole, the local intensification of erosion around pile is more significant, while the blocking effect of pile that extends the eroded area is relatively reduced. On the other hand, the earth pressure, bearing capacity, and unbalanced force and moment of pile are measured and calculated during the erosion, and their response characteristics to erosion are obtained that the pile bearing capacity quickly declines, the unbalanced force and moment on pile significantly increase with erosion, and the variation degree is more dramatical when the pile is closer to the loss hole. The research presented by this study is conducive to the safety control of urban underground space and the next-step numerical modeling on this issue.
ISSN:1861-1125
1861-1133
DOI:10.1007/s11440-023-02018-9