煤矿安全2026，Vol.57Issue(7)：71-80,10.DOI:10.13347/j.cnki.mkaq.20250144
基于鞭梢效应的煤岩组合体超低摩擦效应研究
Study on ultra-low friction effect of coal-rock assemblage based on whiplash effect
摘要
Abstract
To further reveal the influence mechanism of the size proportion of coal-rock assemblages on ultra-low friction rockbursts,a theoretical benchmark model of the ultra-low friction effect was established based on blocky rock masses.Starting from structural characteristics,the experimental model of blocky rock masses was linked with the"whiplash effect".A sandstone-coal-sandstone block structure was adopted to simulate the actual roof-coal seam-floor conditions encountered in underground coal mining.Combin-ing a self-developed ultra-low friction test device with FLAC3D numerical simulation,the influence of the height-width ratio of the"working block"on the stability of the block structural system model under the same stress environment was analyzed.The hori-zontal displacement and horizontal acceleration of the"working block"were used as indicators to characterize the intensity of the ultra-low friction effect.The correlation between the susceptibility of generating the ultra-low friction effect in the system and the ab-rupt change characteristics of the horizontal displacement of the"working block"was analyzed.The results show that the size pro-portion of the"working block"has a significant influence on the triggering threshold of the ultra-low friction effect.As the height-width ratio of the"working block"increases within a certain range,its horizontal displacement exhibits a nonlinear response of first decreasing and then increasing,while the stability first increases and then decreases.Significant instability characteristics are ob-served in the typical case"h-100 mm"(i.e.,the height of the"working block"is 100 mm,with a height-width ratio of 1:1):the x-direction acceleration time-history curve shows sustained asymmetric oscillation deviating from zero,producing persistent and irre-versible effects;the z-direction acceleration is amplified in phase,triggering instability sliding induced by the ultra-low friction ef-fect until severe slip instability of the system occurs.关键词
冲击地压/煤岩组合体/超低摩擦效应/FLAC3D/应力波扰动Key words
rock burst/coal-rock assemblage/ultra-low friction effect/FLAC3D/stress wave disturbance分类
矿业与冶金引用本文复制引用
唐垒,于正兴..基于鞭梢效应的煤岩组合体超低摩擦效应研究[J].煤矿安全,2026,57(7):71-80,10.基金项目
国家矿山安全监察局安全生产科研攻关资助项目(第一批) （第一批）
2023中国安科院基本科研业务费专项资金资助项目(2023JBKY04) （2023JBKY04）
