Application of the tensile strength to rock blasting

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H. Azzouz Rached, Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S. Yahyaoui, Dr. Sc. (Tech.), Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


Purpose. Determination of the blastability index from rock strength properties, which employ load rate orders of magnitude that encountered in blasting. These results may be relevant to fragmentation by blasting. The resistance of rocks to blasting and the capability to apply the tensile strength tests and interpret them in relation with rock characterization.

Methodology. The direct uniaxial tensile strength, Brazilian test, and point load tests have been applied on rock material drilled out from the vicinity of blasting operation before and after blasting.

Findings. Unlike the point load tests, neither the Brazilian nor the uniaxial strength tests indicated a particular decrease in the strength of the remaining rock material after the blasting. The results of fracture frequency and rock quality designation showed a low degree of the damage caused to the remaining rock in part of the mass near the blast. On the basis of the results from the tests mentioned above, the low degree of the problems faced after the blasting may be explained with reference to the state of discontinuity of the rock material. In addition, the results suggest that more research must be conducted by the use of Brazilian and uniaxial tensile strength tests as methods for characterizing the rock strength for fragmentation.

Originality. The identification of the blastability index from the strength properties of rock and definition of characteristics of the rock strength for fragmentation.

Practical value. The findings obtained based on assessment of the strength properties of the rock can become the basis for the design of blasting in a site.


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