Optimization of blasting parameters in large structure mining sites based on similarity models and PBM-FEM-DEM coupling algorithm
YOU Yuanyuan
YANG Renshu
ZUO Jinjing
ZHANG Xiliang
YANG Guoliang
CUI Zhengrong
MA Xinmin
ZHANG Xiang
ZHAO Yong
Abstract：To address the challenges of high large-block rate and severe damage to the rear ore body in the segmented caving method without bottom pillars for mining with large structural parameters,the large structural parameter mining site at Gongchangling underground mine was selected as the research object.Using a super dynamic strain monitoring system,the dy-namic evolution characteristics of the rear strain field in similar models under different charging structures and detonation modes were captured.The characteristics of block size distribution were analyzed using the Gates-Gadin-Schuhmann distribution function.A new PBM-FEM-DEM coupling algorithm was established,and numerical models were developed at the engi-neering scale to simulate various charging structures and delayed detonation modes.The thro-wing process of blasting fragmentation,characteristics of block size distribution,and mecha-nisms of damage evolution under different charging structures and blasting modes were re-vealed.The study determined the optimal charging structure and detonation mode for large structure parameter mining sites.Based on the findings,an innovative technology suitable for large-structure mining sites was proposed for efficient explosion energy utilization and damage control,featuring an"air interval charge+inverted V-shaped delayed detonation mode."The research findings suggest that,under the inverted V-shaped delayed detonation mode with the charge coincidence degree of 0.5 for air interval charges,the number of both large and small blasting blocks is smaller,and the distribution uniformity of blasting blocks is moderate.The minimum peak strain values recorded at various measuring points in the rear strain field of sim-ilar models are 1.68 × 10-3,1.08×10-3 and 0.27×10-3.Additionally,under this detonation mode,the DEM discrete element analysis indicates the moderate blasting fragmentation and minimal damage to the rear ore body.The research findings provide valuable insights for opti-mizing charge structures and detonation modes in large-structure parameter mining sites under similar working conditions.
Keywords：large structural parametersblastingblock sizePBM-FEM-DEM couplingdamage
Publication Date：2025-07-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 796-810 )