CHALK PROBLEMS BEATEN ON HERTS BY-PASS

The construction of the a505 by-pass of great offley and particularly the difficulties encountered in handling the very wet chalk deposits are discussed. A large volume of the chalk that had to be shifted had a high moisture content which is reported to have become putty-like on handling, making compaction difficult. Three methods of overcoming chalk handling problems are described: mixing the chalk with glacial deposits when available, scraping a thin layer of chalk and leaving it on an embankment to gain strength, and using loadrig shovels in preference to scrapers for excavating, in order to retain the nature of the chalk. It is also pointed out that because of the presence of very wet chalk, more reliable results of compaction were obtained by only rolling the filling material until it heaved and then testing for compaction, rather than using a fixed number of passes which could have resulted in over compaction. The drainage by means of lagoons constructed in the chalk is also described. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00107859
• Corporate Authors:

  IPC Building and Contract Journals Limited

  32 Southwark Bridge Road
  London SE1 9EX,   England 
• Publication Date: 1975-1-9

Language

• English

Media Info

• Features: Photos;
• Pagination: p. 22-23
• Serial:
  • CONTRACT JOURNAL
  • Volume: 263
  • Issue Number: 4975
  • Publisher: Reed Business Information, Limited
  • ISSN: 0010-7859

Subject/Index Terms

• TRT Terms: Bypasses; Chalks; Compaction; Drainage; Earthwork; Excavations; Lagoons; Moisture content; Road construction; Till
• Geographic Terms: United Kingdom
• Old TRIS Terms: Glacial deposits
• ITRD Terms: 2709: Bypass (loop road); 4120: Chalk; 3686: Compaction; 2937: Drainage; 5920: Moisture content; 3665: Road construction; 8119: United Kingdom
• Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology; I51: Earthworks and Soil Drainage;

Filing Info

• Accession Number: 00096769
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jul 24 1975 12:00AM