BEHAVIOUR OF FILL FROM SOFT CHALK AND SOFT CHALK/CLAY MIXTURES

A series of laboratory tests was undertaken to investigate the prolonged time taken by soft chalk and soft chalk/clay mixtures placed in embankments on the M4 motorway to stabilize sufficiently for further fill to be placed on top. It is shown that the presence of the clay both severely increases the setting time and reduces the ultimate bearing strength of the chalk. Also, that the air voids of uncontaminated soft upper chalk should be between 5% and 10% for maximum bearing strength immediately after compaction. It is argued that minimum compaction compatible with acceptable long-term settlement is the most effective method of forming soft chalk embankments with minimal risk of interruption due to instability of the chalk mass. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0727700693
• Supplemental Notes:
  • Clay Fills. Proceedings of the Conference held at the Institution of Civil Engineers, 14-15 November, 1978.
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Perry, S H
• Conference:
  • Institution of Civil Engineers, Proceedings
• Publication Date: 1979

Media Info

• Features: Figures; References;
• Pagination: p. 189-196

Subject/Index Terms

• TRT Terms: Air voids; Bearing capacity; California bearing ratio; Chalks; Channels (Waterways); Clay; Compaction; Conferences; Embankments; Fills; Freeways; Ground settlement; Mixtures; Porosity; Setting (Concrete); Soft clays; Soil compaction; Stability (Mechanics); Strength of materials; Time; Ultimate strength
• Uncontrolled Terms: Setting time
• Geographic Terms: United Kingdom
• Old TRIS Terms: Air voids content; Embankment compaction; Embankment stability
• ITRD Terms: 3087: California bearing ratio; 4120: Chalk; 4177: Clay; 3686: Compaction; 8525: Conference; 2801: Embankment; 2752: Motorway; 5938: Porosity; 5792: Settlement; 5544: Strength (mater); 5414: Time; 8119: United Kingdom
• Subject Areas: Geotechnology; Highways; I51: Earthworks and Soil Drainage;

Filing Info

• Accession Number: 00311718
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0 7277 0069 3
• Report/Paper Numbers: Proceeding
• Files: ITRD, TRIS
• Created Date: Nov 19 1980 12:00AM