FIELD STUDY OF FILTER DRAINS AT SWANLEY, KENT

Filter drains play an important role in highway works, in removing sub-surface water and ensuring the stability of earthworks, pavements and retaining structures. This report, the third in a series, describes a study of the present condition and effectiveness of filter drains incorporating both granular materials and geotextiles at swanley, Kent. The drains were originally constructed about 1962, but proved to be inadequate to deal with surface water. The worst affected areas were therefore reconstructed from 1981, by replacing the granular filter material and incorporating a geotextile filter. Trial excavation and tests showed that the granular filter material in the original drains was gap-graded. In the reconstructed lengths, the geotextile was effective in retaining detritus and passing surface water, although there was evidence of some damage during installation. Detritus was found to be accumulating in the upper part of the drain to an extent which would eventually impede drainage. The implications for granular and geotextile filter materials are discussed. (a)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02665247
• Corporate Authors:

  Transport and Road Research Laboratory (TRRL)

  Wokingham, Berkshire  United Kingdom 
• Authors:
  • FARRAR, D M
  • Samuel, H R
• Publication Date: 1989

Language

• English

Media Info

• Pagination: 9 p.
• Serial:
  • TRRL RESEARCH REPORT
  • Issue Number: RR 1
  • Publisher: Transport and Road Research Laboratory (TRRL)
  • ISSN: 0266-5247

Subject/Index Terms

• TRT Terms: Chalks; Construction; Design; Drainage; Filters; Geotextiles; Granular materials; Highways; Water table
• Uncontrolled Terms: Decreases
• Geographic Terms: United Kingdom
• ITRD Terms: 4120: Chalk; 3655: Construction; 9009: Decrease; 9011: Design (overall design); 2937: Drainage; 7182: Filter; 4568: Geotextile; 4107: Granular; 2755: Highway; 8119: United Kingdom; 4394: Water table
• Subject Areas: Construction; Design; Geotechnology; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00487745
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: 79
• Files: ITRD, TRIS, ATRI
• Created Date: Sep 30 1989 12:00AM