Triaxial Testing of Weak Rocks Including the Use of Triaxial Extension Tests

PJ Millar; DR Murray

doi:10.1520/STP29088S

SYMPOSIA PAPER Published: 01 January 1988

STP29088S

Triaxial Testing of Weak Rocks Including the Use of Triaxial Extension Tests

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The strength parameters of New Zealand Tertiary weak rocks are found to be intermediate between soil and rock. The nonlinear strength envelopes of these materials for the range of stresses encountered in engineering structures mean that the strength parameters cannot be adequately defined using standard triaxial compression tests.

The strength properties can be established at low stress levels by the triaxial extension test which allows tensile stresses to be developed in the neck of truncated specimens. At high stress levels a high stress triaxial cell is used with confining pressures up to 15 MPa.

Author Information

Millar, PJ

Ministry of Works and Development, Wellington, New Zealand

Murray, DR

Ministry of Works and Development, Wellington, New Zealand

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Details

Developed by Committee: D18

Pages: 376–386

DOI: 10.1520/STP29088S

ISBN-EB: 978-0-8031-5048-5

ISBN-13: 978-0-8031-0983-4

Triaxial Testing of Weak Rocks Including the Use of Triaxial Extension Tests

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