eRocks

A rock sample is pulled axially until it yields. This is performed in a similar way to that of well established metallurgical tests. The main problem encountered is the method used for gripping the sample. Ramana and Sarma [1987] proposed a method of using split-collar grips as a means of applying the force to the sample. The grips themselves require a lining of cork to reduce stress build-up, which needs to be renewed every thirty tests. It was concluded that this method was comparable to the indirect Brazilian test.

The International Standard of Rock Mechanics [Brown (Ed) 1981] discusses problems associated with bending and subsequent stress concentrations which can affect results. These factors have to be considered. One problem related to this type of test is the need for sample lengths, which are long enough to be gripped adequately.

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