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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摘要利用岩石力学伺服试验机与声发射仪，对经历不同高温后非共面双裂隙红砂岩试样(尺寸为80 mm×160 mm× 30 mm)进行单轴压缩试验，分析高温对非共面双裂隙红砂岩强度变形特性与裂纹演化特征的影响。结果表明，非共面双裂隙红砂岩的峰值强度与杨氏模量均随着温度的增加呈先增大后减小的非线性变化规律，在温度为300 ℃时达到最大值，然而，峰值应变随着温度的增加呈非线性增大。基于对非共面双裂隙红砂岩加载过程中的声发射特征分析，应力–时间曲线上每发生一个明显的应力跌落对应会产生一个较大的声发射事件，体现在试样上为产生一条新裂纹或原有裂纹扩展；通过照相量测技术，分析了不同高温作用后非共面双裂隙红砂岩试样的裂纹演化特征。最后探讨了温度对非共面双裂隙红砂岩起裂与贯通应力的影响及其对力学参数的影响机制，起裂应力随着温度的增加呈先增大后减小，在300 ℃时为最大值；而常温至600 ℃时，贯通应力呈增大趋势，但由600 ℃增至900 ℃时，贯通应力变化不大。

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关键词 ：岩石力学, 红砂岩, 非共面双裂隙, 声发射, 裂纹演化

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

收稿日期: 2014-04-04

引用本文:

杨圣奇1，2，黄彦华1，温森1. 高温后非共面双裂隙红砂岩力学特性试验研究[J]. 岩石力学与工程学报, 2015, 34(03): 440-451.
YANG Shengqi 1，2，HUANG Yanhua1，WEN Sen1. EXPERIMENTAL STUDY OF MECHANICAL BEHAVIOR OF RED SANDSTONE WITH TWO NON-COPLANAR FISSURES AFTER HIGH TEMPERATURE HEATING. , 2015, 34(03): 440-451.

链接本文:

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

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