高温后非共面双裂隙红砂岩力学特性试验研究

doi:10.13722/j.cnki.jrme.2015.03.002

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Abstract The uniaxial compression tests on red sandstone samples with two non-coplanar fissures after the heating of high temperatures(the sample size is 80 mm×160 mm×30 mm) were carried out with a servo-controlled testing system of rock and acoustic emission(AE) equipment to investigate the effect of high temperature on strength，deformation and crack behavior. With the increase of temperature，the peak strength，the elastic modulus and the deformation modulus of red sandstone with two non-coplanar fissures were found to increase initially and then to decrease with the maximum value occurred at 300 ℃. However，the peak strain of the tested specimen increased nonlinearly with the increasing of temperature. Pronounced AE events occurred whenever the stress drops occurred，which corresponds to the initiation or coalescence of cracks in red sandstone samples. The effect of high temperature on the evolution of cracks was analyzed with the photographic measurement. It was found that，with the increase of temperature，the stress at crack initiation increased firstly and then decreased with the maximum value occurred at 300 ℃. However，the stress at crack coalescence increased from the room temperature to 600 ℃ and then changed little when the temperature varied from 600 ℃ to 900 ℃.

Key words： rock mechanics red sandstone two non-coplanar fissures acoustic emission(AE) crack evolution

Received: 04 April 2014

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.03.002 OR http://www.rockmech.org/EN/Y2015/V34/I03/440

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