A method to model the effect of pre-existing cracks on P-wave velocity in rocks

Crack closure is one of the reasons inducing changes of P-wave velocity of rocks under compression. In this context, a method is proposed to investigate the relationships among P-wave velocity, pre-existing cracks, and confining pressure based on the discrete element method (DEM). Pre-existing open cracks inside the rocks are generated by the initial gap of the flat-joint model. The validity of the method is evaluated by comparing the P-wave...