【摘要】 为揭示采场充填体变形及声发射特征,针对石人沟铁矿采场充填体开展了单轴加载的声发射试验。结果表明:充填体试件变形破裂过程分为压密线弹性、塑性屈服、应变软化、塑性破坏四个阶段;声发射特性参数随加载的进行呈现出阶段性变化的特点,能够很好地反映充填体在压缩破坏过程中的内部结构变化及损伤破裂情况;充填体单轴压缩破坏形态以张拉破裂为主,剪切破裂为辅,声发射特性参数RA、AF值分布规律能够反映充填体破坏裂纹演化机制。更多还原

【Abstract】 In order to reveal the deformation and acoustic emission(AE)characteristics of filling body in stope,the AE experiments under uniaxial compression were carried out aimed at the filling body in the stopes of Shirengou Iron Mine.The results showed that the deformation and fracture process of filling body was divided into four stages,including the compaction elastic,the plastic yield,the strain softening and the plastic failure.The characteristic parameters of AE presented step change with loading,which could reflect the internal structure change and fracture state of filling body during the compression failure.Under the uniaxial compression,the tension fracture was the main failure mode of filling body,and the shear fracture was the second.Besides,according to the distribution of RA and AF,the evolution mechanism of failure cracks could be deduced.更多还原