Journal Published Online: 01 March 2001
Volume 24, Issue 1

Development of a New In-Situ Direct Shear Test



An in-situ direct shear test apparatus, in both small and large sizes, and its testing techniques have been developed. This test is performed simply by pulling horizontally a latticed shearing frame, embedded in the ground, with a flexible rope or chain under the application of a constant vertical load on the sample. In the new test, the real normal and shear stresses acting on the shear plane can be exactly measured. A number of the large-sized in-situ direct shear tests have been performed on eight kinds of coarse-grained granular materials including rockfills at different construction sites of embankments. The measured shear strengths approximate those of large-sized triaxial compression tests on samples with parallel grain-size distributions. The smaller version of this new test has been used successfully for testing sands and clays. For clays, artificially produced or in-situ, the measured undrained shear strengths are nearly equal to qu/2 by unconfined compression tests on the same clays. The extreme simplicity and high accuracy of this newly developed test are emphasized.

Author Information

Matsuoka, H
Nagoya Institute of Technology, Nagoya, Japan
Liu, S
Nagoya Institute of Technology, Nagoya, Japan
Sun, D
Nagoya Institute of Technology, Nagoya, Japan
Nishikata, U
Technical Research Center, Kansai Electric Power Co., Inc., Amagaki, Hyogo Prefecture, Japan
Pages: 11
Price: $25.00
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Stock #: GTJ11285J
ISSN: 0149-6115
DOI: 10.1520/GTJ11285J