GLACIAL TILL TESTING AND IMPROVED PRESSUREMETER

The article describes a method of in situ testing of glacial tills by a new form of pressuremeter thereby avoiding problems of sample recovery and the need for laboratory testing. The diameter of the pressuremeter before inflation is about 135 millimeters and the cylindrical length is about 500 millimeters. It is used in a 150 millimeter borehole common in british site investigations. The air pressure inside the device is measured by a transducer. The deformations of the cylindrical membrane along six or more radii in one plane, are measured using spring loaded rods linked to potentiometers. This expansion-pressure relationship for the soil surrounding the borehole cavity is obtained under constant rate of deformation conditions. The undrained shear strength of the soil is calculated from this relationship using several interpretations. The methods of interpreting the data are reviewed and it is found that for a single test the values of undrained shear strength deduced from these interpretations lies within plus or minus 10 per cent of the mean and one 40 to 70 per cent higher than the laboratory and in situ bearing plate test values. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/10480594
• Corporate Authors:

  Morgan-Grampian (Professional Press) Limited

  Morgan-Grampian House, Calderwood Street
  London SE18 6QH,   England 
• Authors:
  • Mckinlay, D G
  • ANDERSON, W F
• Publication Date: 1974-11

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 47-53
• Serial:
  • Civil Engineering
  • Issue Number: 819
  • Publisher: American Society of Civil Engineers
  • ISSN: 0885-7024
  • Serial URL: http://www.pubs.asce.org/ceonline/newce/html

Subject/Index Terms

• TRT Terms: Boreholes; Deformation; Equipment; Expansion; Field tests; Glacial soils; Pressure; Pressure gages; Shear strength; Strength of materials; Tests; Till; Undrained shear strength
• Old TRIS Terms: Insitu methods
• ITRD Terms: 6155: Apparatus (measuring); 5711: Bore hole; 4198: Boulder clay; 5595: Deformation; 6720: Expansion; 4011: Glacial; 6226: In situ; 5412: Pressure; 5531: Shear; 5544: Strength (mater); 6255: Test
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00125574
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Mar 29 1976 12:00AM