SANDWICKS HELP SPEED UP KENT BYPASS

There has been an unusual application of pre-packed 'sandwick' drains on a half constructed embankment of the A256 Sandwich bypass. It was discovered that pore water pressure on the alluvium beneath the embankment was not dissipating as quickly as expected. Vertical sand drains were found to be necessary to provide a further drainage path for the pore water upwards into a 0.5 M drainage blanket at the base of the embankment. Cementation's design using a 65 mm diameter woven-polypropylene stocking was used. The site-filled drains were inserted in previously prepared pores drilled through the half constructed embankment and the alluvium to the thanet sands 9 M below. The spacing of the sand drains, important to their efficient operation, varied from 3.5 M at the start of the embankment to 0.8 M at the viaduct abutment. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03077683
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Dadson, J
• Publication Date: 1978-6-22

Language

• English

Media Info

• Features: Figures; Photos;
• Pagination: p. 18
• Serial:
  • NEW CIVIL ENGINEER
  • Issue Number: 298
  • Publisher: EMAP CONSTRUCT LIMITED
  • ISSN: 0307-7683

Subject/Index Terms

• TRT Terms: Abutments; Alluvium; Embankments; Pore water pressures; Sand drains; Surface drainage; Viaducts
• Uncontrolled Terms: Position
• Old TRIS Terms: Highway drainage
• ITRD Terms: 4030: Alluvium; 2801: Embankment; 9061: Location; 5762: Pore water pressure; 2929: Sand drain
• Subject Areas: Geotechnology; Highways; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00184462
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Monograph
• Files: ITRD, TRIS
• Created Date: Jan 13 1979 12:00AM