SYMPOSIA PAPER Published: 01 January 1957

A Procedure for Separately Evaluating Friction and Cohesion of Soils by a Consolidated Direct Shear Test


This paper discusses the merits of the consolidated direct box shear test for soils and the use of test results in foundation stability problems. The necessity for evaluating the friction angle and cohesion as separate quantities, which together form the end products of the test, is emphasized. The frictional component of shear strength is treated as a transient quantity, dependent entirely upon effective normal pressure. The cohesion component of the shear strength is a permanently built-in characteristic of the soil and is dependent upon the pressure to which the soil has been consolidated. This paper describes a consolidated direct shear test procedure by which the angle of friction and the unit cohesion under varying consolidation pressures may be evaluated. Interpretation of the resulting data is indicated and compared with conventional assumptions.

Author Information

Palmer, L., A.
U. S. Dept. of the Navy, Washington, D. C.
Brown, Philip, P.
U. S. Dept. of the Navy, Washington, D. C.
Yeomans, C., M.
U. S. Dept. of the Navy, Washington, D. C.
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Developed by Committee: D18
Pages: 34–49
DOI: 10.1520/STP45842S
ISBN-EB: 978-0-8031-6745-2
ISBN-13: 978-0-8031-6551-9