采矿与岩层控制工程学报2025，Vol.7Issue(3)：47-63,17.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1460
真三轴动静组合加载下非均质花岗岩损伤特性与能量演化机制研究
Damage characteristics and energy evolution mechanism of heterogeneous granite under true triaxial dynamic and static loading
摘要
Abstract
To investigate the dynamic mechanical properties and energy evolution behavior of heterogeneous granite under triaxial stress condition,combined dynamic-static loading cyclic tests were conducted on muscovite and vein-type granites using a true triaxial Hopkinson apparatus.Using the couploed FLAC3D-PFC3D coupling modeling,the effects of triaxial stress constraints and high strain rates on the dynamic crack propagation and energy evolution mechanisms of heterogeneous granite were investigated.The results show that during the cyclic dynamic loading process,the connectivity of the internal crack network in granite gradually increases,ultimately forming a highly dense macroscopic shear fracture network parallel to the direction of the minimum principal stress,with the dike specimens showing significantly lower impact resistance.Increasing axial stress raises the proportion of intergranular tensile cracks.This in turn reduces the crack initiation stress ratio(σci/σd)and the damage threshold stress ratio(σcd/σd),achieving crack initiation stress and damage stress threshold earlier,and significantly weakening the dynamic strength of the samples.Lateral stress confinement increases the dynamic damage stress threshold of the samples,delays the timing of its occurrence,suppresses the frictional sliding of particles,reduces the release of destructive kinetic energy,and shows a strengthening effect on the dynamic strength of the samples.Under the true triaxial stress confinement,the impact loading mainly contributes to the dissipation of sliding friction energy,while the kinetic energy remains at relatively low levels throughout the process.关键词
动静组合荷载/非均质岩石/动态损伤/能量演化/3D-GBM模型Key words
dynamic-static combined loading/heterogeneous rock/dynamic damage/energy evolution/3D-GBM model分类
土木建筑引用本文复制引用
龚航里,王明洋,罗忆,邱艳宇,刘婷婷,李新平..真三轴动静组合加载下非均质花岗岩损伤特性与能量演化机制研究[J].采矿与岩层控制工程学报,2025,7(3):47-63,17.基金项目
国家重点研发计划资助项目(2021YFC3100800) （2021YFC3100800）
国家自然科学基金面上资助项目(51979208) （51979208）
中国博士后科学基金面上资助项目(2024M762516) （2024M762516）
