CORRELATING THE SPT N VALUE WITH CHALK GRADE FOR SOME ZONES OF THE UPPER CHALK

In this note the author examines the correlation between SPT n value and observed chalk grade for some upper chalk zones, using data from two large site investigations in Hampshire, referring only to chalk above the ground water table. The chalk as exposed in test pits was graded, and these grades compared with SPT in values recorded in shell and auger boreholes adjacent to the test pits. The chalk was graded using the classification system of Ward et al and Wakeling. It is concluded that different areas of chalk outcrop have different correlations between n value and chalk grade, and that for the upper chalk studied, it is not easy to interpret chalk grade directly from the n values. The importance of visual observations is emphasised, together with the need to correlate chalk grade with n value. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00168505
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Dennehy, J P
• Publication Date: 1975-9

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 610-614
• Serial:
  • GEOTECHNIQUE
  • Volume: 25
  • Issue Number: 3
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Chalks; Classification; Correlation analysis; Density; Dynamic penetration test; Grading; Ground settlement; Modulus of elasticity; Soil penetration test; Strength of materials
• Uncontrolled Terms: Grading
• Geographic Terms: United Kingdom
• Old TRIS Terms: N value penetration
• ITRD Terms: 4120: Chalk; 8513: Classification; 5908: Density; 6296: Dynamic penetration test; 5919: Modulus of elasticity; 5792: Settlement; 5544: Strength (mater); 8119: United Kingdom
• Subject Areas: Data and Information Technology; Geotechnology; Highways; I43: Rock Mechanics;

Filing Info

• Accession Number: 00129987
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Apr 7 1976 12:00AM