DETERMINATION OF THE TENSILE STRENGTH OF ROCK BY A COMPRESSION TEST OF AN IRREGULAR TEST PIECE

Abstract The stress in an irregular test pair subjected to a pair of concentrated loads was analysed theoretically as well as experimentally. From the result of this analysis together with the experiments carried out on several kinds of rock, it was found that the tensile strength of rock could be approximately determined by 0·9 times the critical load under which the test piece broke, divided by the square of the distance between the points of loading.