The influence of planar discontinuities on the shear strength of a rock-like material.

Brown, E. T. (Edwin Thomas), 1938- (1968). The influence of planar discontinuities on the shear strength of a rock-like material. PhD Thesis, School of Engineering, The University of Queensland.

       
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Author Brown, E. T. (Edwin Thomas), 1938-
Thesis Title The influence of planar discontinuities on the shear strength of a rock-like material.
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 1968
Thesis type PhD Thesis
Total pages 287
Language eng
Subjects 861004 Plaster and Plaster Products
Formatted abstract The influence of planar discontinuities on the strength of a brittle material is studied by means of triaxial compression testing of samples of a high strength gypsum plaster (Patternstone U) containing pre-formed joint planes. It is shown that in unconfined and triaxial compression, direct and indirect tension and friction tests, Patternstone U exhibits rock-like behaviour and is a suitable material for use in rock mechanics investigations. 

The results of triaxial compression tests carried out on

(a) 2" diameter cylinders containing a single inclined joint plane or two or three parallel joint planes (Series D), and

(b) 4" X 4" X 8" rectangular prisms containing three sets of joint planes intersecting at right angles (Series P), are presented.

It is shown that the shear strength of both types of sample can be described by the equation
              r = Z  Ó n ¥
where Z and ¥ are dependent on the orientation of the joint planes to the principal stress directions. No simple relationship between the results of Series D and Series E tests exists, and it is argued that in any given situation the parameters Z and ¥ can be determined only by extensive testing. Currently used theories of the strength of jointed and anisotropic rock are not applicable to the test results and are considered to be over-simplifications.

As an adjunct to these investigations, certain amomolous aspects of the behaviour of rock in direct and indirect tension are highlighted and explained in terms of an effective tensile stress theory of failure.
Keyword Strength of materials.
Rock mechanics.

 
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