Abstract: There are a large number of joints, cracks, and other defects in natural rock masses, which block and attenuate the propagation of explosive blasting energy. Based on the ANSYS/LS-DYNA numerical simulation software, this paper establishes a numerical model for linear elastic jointed rock blasting, and studies the influence of different occurrences of joints on the transmitted and reflected energy of explosive stress waves. The results show that as the joint thickness increases, the transmitted energy ratio gradually decreases and tends to stabilize, while the reflected energy ratio gradually increases and tends to stabilize; as the distance between the joint and the explosion source increases, the transmitted energy ratio gradually increases and tends to stabilize, while the reflected energy ratio gradually decreases and tends to stabilize; as the joint inclination angle increases, the transmitted energy ratio increases and gradually approaches 1.0, while the reflected energy ratio gradually decreases and approaches 0. When joints are filled with different materials, the smaller the elastic modulus of the filling material compared to that of the rock, the stronger the ability to reflect the energy of explosive stress waves, and the harder it is for stress waves to pass through the joint. The transmittance of explosive stress waves gradually decreases with the increase of the number of joints, and the more joints there are, the smaller the influence of joint thickness on the energy transmittance of explosive stress waves.
Keywords: rock blasting; joint properties; blasting energy; numerical simulation
合肥工业大学学报自科版