Analysis of the Influence of Blast-induced Free Surface on Rock Fragmentation Characteristics in Deep-hole Blasting with Numerical Analysis
Advances in Research · pp. 461–470 · Published 31 Dec 2025
10.9734/air/2025/v26i61563Abstract
To thoroughly investigate the influence of blast-induced free surfaces on rock fragmentation characteristics, a three-dimensional blasting model was established using ANSYS/LS-DYNA software. The ALE fluid-structure coupling algorithm and the RHT rock constitutive model were employed to simulate the blasting process under different blast-induced free surface conditions. The study analyzed the impact of free surfaces generated from previous blast holes on subsequent blast hole rock failure. Simulation results demonstrate that: 1) With the increase in the number of blast-induced free surfaces, the damage range of the rock mass progressively increases; 2) The damage proportion reaches 15.1% with a single free surface, 20.3% with two free surfaces, and 32% with three free surfaces. The data clearly indicate that as the free surfaces increases, the rock damage range expands, and the fragmentation effect becomes more pronounced. This research on rock damage range under varying free surface conditions provides a theoretical basis for optimizing blast design and controlling rock fracture propagation.
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