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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.
A servo experiment machine was used to test the confined compression experiments of different proportion of filling body - rock column to study the peak strength, residual strength, peak strain, failure mode and the compression characteristics of the filling body - rock column under different working conditions. The results show that the pressure-bearing process of filling body-rock column is mainly divided into the bearing stage of rock column, the failure stage of rock column specimen, the co-bearing of the filling body and rock column until the failure stage, the pressure of filling body and rock column Stage.With the increase of the strength of the filling body, the peak strength and the residual strength of the rock column and the axial strain at the time of failure gradually increase, and at the same time, the failure mode of the rock column gradually changes from the tensile failure at uniaxial compression to the shear failure However, the rock columns which are not filled by the packings are mainly subjected to the monocline shear failure, which shows a stronger abrupt change when the single rock columns are damaged, compared with the slope after the stress-strain curve of the pack-rock columns.