首页|Investigation of stress-induced progressive failure of mine pillars using a Voronoi grain-based breakable block model

Investigation of stress-induced progressive failure of mine pillars using a Voronoi grain-based breakable block model

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The Voronoi grain-based breakable block model(VGBBM)based on the combined finite-discrete element method(FDEM)was proposed to explicitly characterize the failure mechanism and predict the deforma-tion behavior of hard-rock mine pillars.The influence of the microscopic parameters on the macroscopic mechanical behavior was investigated using laboratory-scale models.The field-scale pillar models(width-to-height,W/H=1,2 and 3)were calibrated based on the empirically predicted stress-strain curves of Creighton mine pillars.The results indicated that as the W/H ratios increased,the VGBBM effec-tively predicted the transition from strain-softening to pseudo-ductile behavior in pillars,and explicitly captured the separated rock slabs and the V-shaped damage zones on both sides of pillars and conjugate shear bands in core zones of pillars.The volumetric strain field revealed significant compressional defor-mation in core zones of pillars.While the peak strains of W/H=1 and 2 pillars were relatively consistent,there were significant differences in the strain energy storage and release mechanism.W/H was the pri-mary factor influencing the deformation and strain energy in the pillar core.The friction coefficient of the structural plane was also an important factor affecting the pillar strength and the weakest discontinuity angle.The fracture surface was controlled by the discontinuity angle and the friction coefficient.This study demonstrated the capability of the VGBBM in predicting the strengths and deformation behavior of hard-rock pillars in deep mine design.

Pillar strengthFDEMVoronoi tessellationSpallingBulking

Shili Qiu、Shirui Zhang、Quan Jiang、Shaojun Li、Hao Zhang、Qiankuan Wang

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State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China

University of Chinese Academy of Sciences,Beijing 100049,China

State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

National Natural Science Foundation of ChinaNational Key Research and Development Plan Project of China

423771722023YFC2907204

2024

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI
影响因子:1.222
ISSN:2095-2686
年,卷(期):2024.34(5)
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