Based on the mechanism study of new well stimulation method—tailored pulse loading method

the effects of initial stresses in this method is further studied. The effects of initial stresses on the propagation velocities and directions of the cracks around a hole

especially on the energy dissipation in crack extension

are obtained through theoretical analysis

dynamic photo elasticity tests

high speed photography. And large coal specimen tests. These results provide a theoretical foundation for the practical applications of the tailored pulse loading method.