Experimental study on the mechanical properties of rocks at high temperature
Experimental study on the mechanical properties of rocks at high temperature
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DOI：
10.1007/s11431-009-0063-y
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发表时间：
2009-02
期刊：
影响因子：
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通讯作者：
Lian-ying Zhang;X. Mao;A. Lu
中科院分区：
文献类型：
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作者：
Lian-ying Zhang;X. Mao;A. Lu
研究了大理岩、石灰岩、砂岩的力学性能，应力-应变曲线，峰值强度的变化特征，利用MTS 810岩石力学伺服控制试验系统，在室温~ 800°C的温度范围内，对岩石的峰值应变和弹性模量进行了研究。大理岩的峰值强度和弹性模量在常温~ 400°C温度范围内波动;（2）随着温度的升高，石灰岩的峰值强度和弹性模量从常温到200°C呈下降趋势，从200°C到600°C变化不大，超过600°C急剧下降（3）常温至200°C，砂岩峰值强度呈下降趋势，弹性模量变化不大; 200°C至600°C，砂岩峰值强度增大，弹性模量变化不大; 600°C以上，砂岩峰值强度和弹性模量迅速下降。(4)石灰岩的峰值应变在常温至600°C范围内变化不大，超过600°C后峰值应变迅速增大;大理石和砂岩的峰值应变在常温至200°C范围内随温度升高而减小，超过200°C后峰值应变迅速增大。研究结果可为高温岩体工程设计提供有价值的参考。
The mechanical properties of marble, limestone, and sandstone as well as the stress-strain curve, the varying characteristics of the peak strength, the peak strain and elastic modulus were studied by using the MTS810 Rock Mechanics Servo-controlled Testing System under the action of temperatures ranging from room temperature to 800°C Results show that (1) the peak strength and elastic modulus of marble fluctuate at the temperature from normal to 400°C; and they decrease gradually over 400°C (2) With the rise of the temperature, the peak strength and elastic modulus of limestone show downward trend from normal temperature to 200°C have little change from 200°C to 600°C and decrease sharply over 600°C (3) The peak strength of sandstone shows a downward trend while a little change for elastic modulus at normal temperature to 200°C and from 200°C to 600°C, the peak strength of sandstone increases while a little change for elastic modulus; the peak strength and elastic modulus decrease rapidly at the temperature over 600°C. (4) The peak strain of limestone shows little change at normal temperature to 600°C, however, the peak strain increases rapidly over 600°C; and for marble and sandstone, the peak strain decreases with the rise of the temperature from normal temperature to 200°C, the peak strain increases rapidly over 200°C. The result can provide valuable references for the rock engineering design at high temperature.