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The block punch index test

  • Schrier J. S. van der 
Article

Summary

Measurements of rock strength require testing which must be undertaken on test speciments of particular sizes and dimensions in order to fulfill testing standards. This limits the testing of highly broken cores. A Block Punch Index test apparatus has been developed requiring only a small flat sample which can easily by prepared. In the course of the development of this test a total of over 1 150 rock speciments have been tested and the results are presented in a number of correlation diagrams. For engineering purposes the Block Punch Index test seems to be as good as other index tests in indirectly assessing strength, especially if only little rock material is available.

Keywords

Unconfined Compressive Strength Rock Strength Index Test Brazilian Tensile Strength Point Load Strength 

Le «block punch index test»

Résumé

Pour mesurer la résistance d'une roche les essais sont effectués sur des échantillons de dimensions normalisées, ce qui pose des problèmes pour l'étude des carottes très fragmentées. Un matériel d'essai, permettant de travailler, sur un petit échantillon plant facile à préparer, a été mis au point. Au cours de la mise au point de cet essai—le «Block Punch Index Test»—1 150 échantillons de roches ont été étudiés, les résultats sont présentés dans un certain nombre de diagrammes. Pour les applications classiques le «Block Punch Index Test» semble aussi valable que les autres essais pour estimer indirectement la résistance, en particulier lorsqu'on ne dispose que de quantités réduites de roche.

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References

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Copyright information

© International Assocaition of Engineering Geology 1988

Authors and Affiliations

  • Schrier J. S. van der 
    • 1
  1. 1.Faculty of Mining and Petroleum EngineeringDelft University of TechnologyThe Netherlands

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