摘要
利用伺服实验机对不同配比充填体-岩柱进行侧限压缩实验,研究不同工况下岩柱的峰值强度、残余强度、峰值应变、破坏形式,以及充填体-岩柱的受压特性.结果表明:充填体-岩柱的承压过程主要分为岩柱试件承载阶段、岩柱试件的破坏阶段、充填体和岩柱共同承载直到破坏阶段、充填体和岩柱散体承压阶段.随着充填体强度的增大,岩柱的峰值强度、残余强度以及破坏时的轴向应变逐渐增大,同时岩柱的破坏形式逐渐由单轴压缩时的拉伸破坏向剪切破坏转化,而无充填体包裹的岩柱则主要发生单斜面剪切破坏.相比充填体-岩柱应力-应变曲线峰后的下降斜率,单岩柱破坏时表现出了更强的突变性.
The confined compression experiments on different ratio backfill-rock pillar were conducted by servo testing machine to study the peak strength,residual strength,peak strain and failure modes of rock pillar on different conditions and compressive behavior of backfill-rock pillar.The results show that the bearing process of backfill-rock pillar can mainly be divided into rock columns bearing stage,failure stage of rock pillar,backfill and rock pillar joint loading until damage stage and the granular media of backfill and rock pillar bearing stage.With the growth of strength of backfill,the peak strength,residual strength,axial strain at the time of failure of rock pillar increase,and the damage form of rock pillar changes from tensile failure similar to the uniaxial compression to shear failure,but mainly single bevel shear failure for a single pillar without supporting of backfill.The single rock pillar’s slope of the stress-strain curve after the peak is more abrupt comparing with the backfill-rock pillar.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2016年第1期49-55,95,共8页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51374033)
关键词
侧限压缩实验
承压过程
应力-应变特性
岩柱强度
破坏模式
confined compression experiment
bearing process
characteristic of stress-strain
the strength of rock pillar
failure mode
