抄録
In the present study measurements have been made of the stress waves and strains in the cylindrical rock specimen caused by the detonator's attack, and thence some mechanical properties of rocks under such an impulsive loading have been analyzed and discussed.
The results of this investigation have been summarized as follows.
(1) To obtain the stress wave shape, it has been recognized that a method utilizing the displacement of the free end face of the rock specimen is simpler and more convenient than the conventional method developed by Dr. J.S. Rinehart.
(2) The method to obtain the dynamic tensile strength of rock based on the phenomenon known as spalling has been revised more suitably to practical ends.
(3) It has been found from the analysis of the data for the change in the propagation velocity of the stress wave with distance that even in the case of the detonator's attack a plastic wave or a shock wave seems to be generated in the region nearest the shot point.
