Experimental study on backward erosion piping of a double-layer dike foundation under variable exit geometries

Double-layer dike foundation is composed of a weakly permeable overlying clay layer and a highly permeable underlying sand layer, which is one of the most common stratum types in dike engineering with the highest probability of catastrophic damage, and the main danger is backward erosion piping. Existing research on backward erosion piping of double-layer dike foundation has not fully considered the influence of the exit on the erosion process. Therefore, a self-designed test device is used to assess the influences of the size, position and type of different exits, and the circular exit is connected with the slot exit via the exit area to explore the critical identification conditions and the pipe development mechanism toward the upstream direction under different exit geometry conditions. The results show that both the local and global hydraulic gradients borne by the exit are inversely proportional to the exit area and are less notably affected by the location of the exit. The development process of slot exit pipes differs from that of circular exit pipes, and pipes are usually developed alternately at the two corners of the exit near the upstream end and then converge into one pipe. The average pipe depth and width are proportional to the exit size and the seepage length. With increasing average pipe area of the slot exit, pipes develop more rapidly after head enhancement, and the damage to the dike foundation increases.

• Record URL:
  • https://doi.org/10.1016/j.trgeo.2024.101353
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S2214391224001740
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/22143912
• Supplemental Notes:
  • © 2024 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies. Abstract reprinted with permission of Elsevier.
• Authors:
  • Guo, Hengle
  • Ren, Jie
  • Zhang, Lei
  • 0000-0001-8375-5115
  • Kang, Jie
  • Nan, Shenghao
  • Chen, Kaixuan
  • Sui, Jiaheng
  • Zhai, Yuguang
• Publication Date: 2024-9

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 101353
• Serial:
  • Transportation Geotechnics
  • Volume: 48
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 2214-3912
  • Serial URL: http://www.sciencedirect.com/science/journal/22143912

Subject/Index Terms

• TRT Terms: Clay soils; Dikes; Drain pipe; Erosion control; Foundation soils; Sand
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 01930849
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 17 2024 9:29AM