Author/Authors :
Sarfarazi, Vahab Department of Mining Engineering - Hamedan University of Technology, Hamedan, Iran , Asgari, Kaveh Department of Mining Engineering - Shahid Bahonar University of Kerman, Kerman, Iran
Abstract :
In this investigation, the impact of confining pressure on the tensile strength
obtained by point load test (PLT) is examined by particle flow code in two dimensions.
In this regard, at first, a numerical model is calibrated using the Brazilian experimental
test results. The tensile strength of the model material is equal to 2.5 MPa. Secondly,
PLT is performed on the numerical models with dimension of 15 cm × 50 cm. The
rectangular models are tested by PLT under the presence of the confining pressure.
The loading rate is 0.001 mm/min, confining that the pressure is changed with the 13
different values of 0 MPa, 0.002 MPa, 1MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3MPa, 3.5
MPa, 4 MPa, 5MPa, 6 MPa, 9 MPa, and 11 MPa. The results obtained show that the
vertical tensile crack develops through the model under a low confining pressure,
while several shear bands are developed in the models under a high confining pressure.
The number of shear cracks is augmented by augmenting the confining pressure. Is(50)
is the augment by augmenting the confining pressure. Also a new criterion is rendered
in order to determine Is(50) based on the confining pressure.
