The strength and deformation behaviour of rock masses under static loads is well-explored, but our understanding is less comprehensive when it comes to their behaviour under dynamic and impact loads. Limited literature is available on rock mass behaviour under dynamic and impact loading. The present study is aimed at the effect of impact load on the intact and jointed rocks. In most cases, hard rock excavations are carried out with blasting, and therefore, successive impact loads under blasting on jointed rocks are of immense importance. This study investigates the effect of impact load on joint shear and normal stiffness of a jointed rock numerically, considering the inherent isotropy and corresponding mechanical properties of the joints. Numerical simulations are proposed to be performed using the distinct element method (DEM) based commercial package 3DEC from Itasca Inc. Numerical Simulation results will be systematically validated with the experiments using the Split Hopkinson Pressure Bar (SHPB) and provide further insights into the complex interactions within the jointed rock mass with varying joint parameters. This discusses the step-by-step procedure of the DEM-based numerical analysis of the jointed rocks under blast load and highlighting its efficiency and effectiveness.