OBSERVATIONS ON THE UNDRAINED STRENGTH OF A GLACIAL TILL

The engineering character of stiff glacial tills has not been widely reported. There is increasing frequency of building heavily loaded structures bearing on tills and in the assessment of their foundation design difficulty has been experienced in interpreting the rather scattered results frequently obtained in testing such stony soils. The paper compares sampling and testing procedures when applied to the determination of undrained shear strength of stiff unweathered lodgement tills in the Glasgow District of Central Scotland. Values of the undrained strength depend, in part, on the method of interpretation of the test data. The shear strength at failure was taken as the compressive stress corresponding to 20% strain both for laboratory and in situ tests. Coupled U100 samplers were found to be the most satisfactory of the common commercial tools for extracting samples but the recovery of specimens in a satisfactory condition for testing was rather poor. The strength properties differed somewhat according to the test procedure adopted and these differences are described. For satisfactory site assessment of these tills a generous sampling programme is necessary to compensate for poor recovery and scatter of test results. /Author/TRRL/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 503-516
  • Serial:
    • GEOTECHNIQUE
    • Volume: 24
    • Issue Number: 4
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00125130
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 18 1975 12:00AM