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/

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  • 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

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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