Abstract: In order to overcome the deficiencies of RHT constitutive research on damage zoning in rock blasting, a calculation method of fracture determination zoning was established based on rock damage criterion and RHT constitutive equation. The feasibility of this method was verified by numerical simulation and field test. On this basis, the calculation formula of damage radius was further divided and optimized. The results show that the material point method can well simulate the fracture zone divided by the damage critical threshold Dcr and the critical threshold Dcf of the fracture zone under the main lithology of sodium metamorphosed lava. The numerical simulation results are highly consistent with the results of field simulation, proving the fracture determination range feasibility of RHT constitutive. With the increase of the buried depth ratio, the radius of each partition increases first and then decreases. The radius of each partition reaches the maximum when the buried depth ratio is 0.89. Under the conditions of different burial depth ratios, the radius of the broken zone of sodium metamorphosed lava is the largest near the free surface, and it showed a downward trend with increasing depth. The research results can provide a certain method for damage partition calculation in blasting numerical simulation, and provide guidance for blasting engineering design.