Osterberg Cell Using Two Layers for a Case Study with and Without Base Grouting

Static loading test using single level Bi-directional Load Testing Equipment (Earlier called O-Cell) was tested in March 2017 at Pair a Bridge in Bangladesh for verification of initial load testing. Soil consists of soft silt with traces of clay from 0.0 m to 10.5 m underlain by various layers with very dense silty sand at the toe level and below. Pile was constructed using reverse circulation method. Drilling mud was composed of bentonite slury for 2.5 m diameter pile. The load cells were attached to a reinforcing cage at 18 m above toe. Static load test was carried out at 28 days of casting the pile. Testing was carried as per with load increment 7.5 %of estimated ultimate load. It was observed that downward movement of reaching 220 mm and locked downward movement and Bi-directional load was given force for upward movement to find out skin fraction. Base grout was proposed in order to reduce pile bottom settlement .Another pile load test using Bi-directional load testing equipment was carried out near the same location. Pile load test was conducted at 28 days of completing base grouting. It is found that total settlement was reduced to 34 mm for the case of base grouting in place of 227.8 mm for the case of without base grouting for ultimate load of 80 MN. Detailed analysis was carried out and safe design load can be adopted to 52 MN for base grouting case.

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  • Supplemental Notes:
    • Abstract reprinted with permission from the publisher.
  • Authors:
    • Bagui, S K
    • Puri, S K
    • Das, Atasi
  • Publication Date: 2018-10

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 31-38
  • Serial:
    • Indian Highways
    • Volume: 46
    • Issue Number: 10
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 01682958
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 10 2018 3:19PM