Strength and deformation properties of post-high-temperature joint sandstone
Strength and deformation properties of post-high-temperature joint sandstone
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发表时间：
2014
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通讯作者：
LI Qing-se
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作者：
LI Qing-se
通过单轴压缩试验，研究了节理砂岩在不同高温下的物理力学性质。范围包括一系列应力-应变曲线、峰值应力、峰值应变和弹性模量随温度的变化。同时，利用声发射仪监测岩石压缩过程中声发射的分布特征，探讨不同温度对节理砂岩变形破坏机理的影响。温度对节理砂岩性质的影响是多方面的。当温度较低时，对节理砂岩性质的增强作用大于弱化作用;而当温度较高时，则相反。400 ℃是试验中的温度阈值。加载前后，峰值应力、峰值应变和弹性模量呈现不同的变化趋势。高温后裂纹主要分布在接缝附近，单轴压缩后裂纹也主要沿接缝沿着分布。热作用下，砂岩的破坏模式由脆性破坏向韧性破坏转变。
Based on the uniaxial compression test,the physical and mechanical properties of joint sandstone under different high temperatures were studied. The scope included the variation of a series of stress-strain curve,peak stress, peak strain and elastic modulus with temperature changing. Meanwhile,using the acoustic emission instrument,the distributional feature of acoustic emission was monitored in the process of rock compression in order to discuss the effect on the mechanism of deformation and failure of joint sandstones under different temperatures. The influence of temperature on joint sandstone properties is various. When temperature is low,the enhancement effect of joint sandstone properties is greater than the weakening effect; And when the temperature is higher,the result is on the contrary. 400 ℃ is the temperature threshold value in the test. Before and after it,the peak stress,peak strain and elastic modulus show a different trend. The crack is mainly distributed in the joint nearby after high temperature,and the crack also mainly along the joint after uniaxial compression. The failure mode of the sandstone has transferred from brittle failure to ductile failure when heated.