岩土力学2026，Vol.47Issue(1)：281-295,15.DOI:10.16285/j.rsm.2025.0065
深部矿柱渐进失效机制与锚杆支护效应连续-非连续数值研究
Progressive failure mechanism and the effects of rockbolt support on deep pillars using continuous-discontinuous method
摘要
Abstract
To study the failure mechanism of deep pillars and the reinforcement effect of rockbolts,a Voronoi breakable block model(VBBM)on the basis of the combined finite-discrete element method(FDEM)was proposed to characterize rock pillars.Laboratory-and field-scale uniaxial compression tests were conducted to develop a parameter calibration method and to validate the model.Combined with the fully grouted rockbolt model,the study explored the progressive damage mechanism of the pillar and the supporting effect of rockbolts.The results show that the proposed parameter calibration method effectively utilizes laboratory data to determine the model parameters for rock pillars at different scales.Based on reasonable parameter settings,it is found that the model can effectively capture the macroscopic failure mechanisms,including initial edge spalling,shallow-surface spalling,and deep conjugate shear failure within pillars.The width-to-height ratio(W/H)is identified as the fundamental factor influencing the transition from strain-softening behavior to pseudo-ductility behavior of pillars and the deformation differences in the core zone.Passive confinement from rockbolts activates when the pillar undergoes sufficient volumetric expansion.The constraints generated by rockbolts significantly affect the post-peak deformation behavior of pillars.The deformations of pillars exhibit a gradient feature from the shallow surface toward the core.The crack aperture and kinetic-energy release rate are negatively correlated with rockbolt support pressures,which shows a strong power-law relationship.This indicates a transitional range of supporting pressure and an optimal rockbolt spacing.The study provides a powerful analytical framework for elucidating the progressive failure mechanism in deep rock mass,and offers theoretical support for disaster risk assessment and rock-support reliability evaluation in deep mining.关键词
硬岩矿柱/有限元/离散元方法(FDEM)/可破Voronoi块体/锚杆/破坏机制Key words
hard-rock pillar/finite-discrete element method(FDEM)/breakable Voronoi block/rockbolt/failure mechanism分类
矿业与冶金引用本文复制引用
邱士利,张世瑞,江权,黄青富,张合作,向天兵..深部矿柱渐进失效机制与锚杆支护效应连续-非连续数值研究[J].岩土力学,2026,47(1):281-295,15.基金项目
国家重点研发计划(No.2023YFC2907204) （No.2023YFC2907204）
国家自然科学基金(No.42377172,No.52325905). This work was supported by the National Key Research and Development Program of China(2023YFC2907204)and the National Natural Science Foundation of China(42377172,52325905). （No.42377172,No.52325905）
