EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF LIMESTONE AND SANDSTONE UNDER HIGH TEMPERATURE
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摘要:
利用自行研制的岩石加温装置和RMT-150C岩石力学试验机, 对石灰岩和砂岩试样高温后的力学特性进行了试验研究。试验结果表明, 随着温度升高, 两种岩石纵波波速逐渐减小。单轴压缩过程中的全程应力应变曲线经历了压密、弹性、屈服、破坏4个阶段; 达到峰值应力后两种岩石均发生脆性破坏, 砂岩破坏时呈锥形炸裂, 而石灰岩则呈草捆状破坏。高温对两种岩石的强度都有一定的弱化作用, 其峰值应力都随温度升高而降低, 石灰岩700 ℃时强度降幅达84.59 %, 而砂岩强度仅比常温降低22 %左右。两种岩石的峰值应变都随温度升高逐渐增大, 但具体表现不尽相同, 石灰岩500 ℃时应变增加了30.57 %, 500 ℃之后峰值应变基本无变化, 甚至到700 ℃时还略有降低; 砂岩700 ℃时峰值应变增加了80.63 %, 其峰值应变的变化与其微观结构变化相关。随着温度升高, 两种岩石的弹性模量和变形模量均减小, 700 ℃时石灰岩弹性模量降幅为86.8 %, 砂岩弹性模量降幅为46.94 %; 700 ℃时石灰岩变形模量下降了83.9 %, 砂岩的变形模量下降了53.06 %。
Abstract:The mechanical properties of limestone and sandstone under high temperature were investigated by the experiment device used to heat rock designed by ourselves and servo-control testing machine RMT-150C. The results show that the longitudinal wave velocity of two kinds of rocks gradually reduced with temperature increasing. The complete curve of stress and strain under uniaxial compression went through 4 stages, namely densification, elasticity, yielding and failure. They both displayed brittle fracture after reaching peak strength, with the sandstone rupturing and the limestone showing failure like a bundle of grass. The high temperature weakened their strength. Their peak stresses reduced with temperature increasing. At 700 ℃, the peak strength of limestone decreased by 84.59 %, while that of sandstone only decreased by 22 %. Their peak strain increased with temperature increasing, but differed in details. For limestone, its peak strain increased by 30.57 % at 500 ℃, but almost kept unchanged at the higher temperature, and even shaw a little decrease at 700 ℃.For sandstone, however, the peak strain increased by 80.63 % at 700 ℃, displaying a connection with the variation of microstructure. With temperature increasing, their elastic modulus and deformation modulus decreased. At 700 ℃, limestone decreased by 86.8 % in elastic modulus and by 83.9 % in deformation modulus, while sandstone decreased by 46.94 % in elastic modulus and by 53.06 % in deformation modulus.
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Key words:
- limestone /
- sandstone /
- high temperature /
- longitudinal wave velocity /
- mechanical properties /
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