STP483

    Sampling Disturbance in Champlain Clays

    Published: Jan 1971


      Format Pages Price  
    PDF Version (340K) 21 $25   ADD TO CART
    Complete Source PDF (4.6M) 21 $60   ADD TO CART


    Abstract

    A comparison of the results of laboratory tests on block and tube samples shows that the “cemented” sensitive clays are disturbed severely by conventional thin-wall tube sampling. The undrained shear strength is reduced to 50 to 60 percent of its original value, and the recompression index at pressures smaller than the preconsolidation pressure is doubled. Even the effective stress parameters at low stress level are greatly affected by sampling. This effect is attributed to the presence at the contact between the clay particles of “cementation bonds” which have a high sensitivity to strain.

    Keywords:

    sampling, quick clays, marine clays, sample disturbance, shear strength, compression index, piston sampler, evaluation, tests


    Author Information:

    La Rochelle, P
    Professor of civil engineering and Ph.D. Graduate, Laval University, Quebec, P. Q.

    Lefebvre, G
    Professor of civil engineering and Ph.D. Graduate, Laval University, Quebec, P. Q.


    Paper ID: STP26665S

    Committee/Subcommittee: D18.02

    DOI: 10.1520/STP26665S


    CrossRef ASTM International is a member of CrossRef.