冻融循环后大理岩单轴压缩破坏特性及规律研究

为研究大冶铁矿高边坡广泛分布的大理岩在冻融循环后单轴压缩破坏特性及规律,对岩样进行不同冻融次数和不同冻融温度下的冻融试验后,再进行单轴压缩试验。对比分析其单轴压缩应力-应变曲线及破裂面宏观形态,结果表明:经历冻融循环后的大理岩岩样,随冻融次数的增加和冻融温度的降低,岩样内部损伤趋重,弹性变形减弱而塑性增强;破裂面由张破裂向剪破裂转变,由多断面破裂转变为单一断面破裂;破坏模式由轴向劈裂拉伸破坏模式向轴向拉剪破坏模式逐渐过渡。

Characteristics and Laws of The Uniaxial Compression Damage on Marble after Freeze-thaw Cycles

For the uniaxial compression failure characteristics and the law of marble after freeze-thaw cycle widespread in the high slope of Daye Iron, making uniaxial compression test in marble sample after different number and temperature freeze-thaw cycle test.Contrasting and analyzing the sample uniaxial compression stress-strain curves and macro fracture surface morphology,the results show that the marble sampleafter the freeze-thaw cycle damage more serious with the freeze-thaw number adding and the temperature lowering, elastic deformation weake and plastic deformation recede;fracture surface changes from stretch-draw failure to shear failure and from multiple fracture surface to singleness;and failure mode changes from splitting tensile failure mode to axial tensile shear failure mode.