Abstract:Abstract: In order to solve the problem that it is difficult to guarantee the pre-splitting effect and select blasting parameters in pre-splitting blasting, this study adopted numerical simulation technology to simulate and analyze the parameters such as uncoupling coefficient and hole spacing. First, RHT model was selected as the rock material model, which can described the mechanical response behavior of rock under blasting load better. Then the simulation schemes were designed to analyze the effect on the uncoupling coefficient and hole spacing respectively. The simulation results showed that the damage zone decreased with the enlargement of the uncoupling coefficient, and the hole spacing had no influence on the range of blasting damage basically, ;However, the effective pre-crack cannot be formed when the hole spacing was too large. the The optimal blasting parameters were determined to be uncoupling coefficient k=3.5，hole spacing L=700 mm. This research provides a reference for the determination of pre-split blasting parameters in practical engineering.