STP740

    Plane-Strain Testing of Sand

    Published: Jan 1981


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    Abstract

    Sand was tested under triaxial conditions, plane strain conditions, and conditions where the intermediate principal strain (ε2) varied between the limits for triaxial and plane strain. Tests were performed using a variety of specimen sizes and shapes, a range of densities from loose to dense, and a range of confining pressures from 70 to 3450 kN/m2 (10 to 500 psi). The results of these tests provide useful guidelines for plane strain testing of cohesionless soils: (1) Plane strain and triaxial test results differ most for dense specimens tested at low pressures, (2) Plane strain equipment need not be elaborate. Specimens with square cross sections and simple lubricated end plates can be used for plane strain tests, and (3) The end plates need not enforce a condition of perfect plane strain. Tests with values of ε2 as large as 40 percent of the axial strain at failure result in essentially the same value of the angle of internal friction (φ) as do perfect plane strain tests.

    Keywords:

    soil strength, strain, soil properties, soil testing, sands, plane strain testing


    Author Information:

    Marachi, ND
    Vice President, Converse Ward Davis Dixon, San Francisco, Calif.

    Duncan, JM
    Professor of Civil Engineering, research engineer and lecturer, and Professor of Civil Engineering, University of California, Berkeley, Calif.

    Chan, CK
    Professor of Civil Engineering, research engineer and lecturer, and Professor of Civil Engineering, University of California, Berkeley, Calif.

    Seed, HB
    Professor of Civil Engineering, research engineer and lecturer, and Professor of Civil Engineering, University of California, Berkeley, Calif.


    Paper ID: STP28758S

    Committee/Subcommittee: D18.12

    DOI: 10.1520/STP28758S


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