不同循环加卸载路径下红砂岩声发射与应变场演化规律研究

doi:10.13722/j.cnki.jrme.2021.0261

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摘要为研究不同循环加卸载路径下红砂岩的损伤演化规律，基于MTS815岩石力学试验系统对红砂岩开展恒下限和变下限循环加卸载试验，同步进行声发射和数字图像相关技术(DIC)监测。结果表明：相较于单轴压缩试验，恒下限循环加卸载下岩石平均抗压强度提高了6.5%，变下限循环加卸载提高不显著。恒下限循环加卸载下Felicity比平均值随应力增大而持续减小，而变下限循环加卸载后期的Felicity比基本保持不变。表观应变场演化趋势与声发射变化特征一致，恒下限循环加卸载下岩石破坏前损伤变形逐渐增大，呈缓增型特点；而变下限循环加卸载下加卸载前期损伤应变较分散，直至应力超过峰值强度66%时，岩石较大表观应变点才由分散快速集中，局部区域变形急剧增大，呈突变型特点，试样表现为剧烈的脆性破坏，实际工程中应予以重视。

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	王天佐1
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	3
	王春力1
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	薛飞1
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	王林翔1
	2
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	薛梦雅1
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关键词 ：岩石力学, 红砂岩, 循环加卸载, 声发射, 数字图像相关技术, 损伤演化

Abstract：In order to study the damage evolution law of red sandstone under different cyclic loading and unloading paths，the MTS815 rock mechanics test system was used to perform constant lower limit cyclic loading and unloading test and variable lower limit cyclic loading and unloading test on red sandstone. Meanwhile，acoustic emission(AE) and digital image correlation(DIC) monitoring technique were carried out to capture microfracture and strain evolution information during test. The results showed that compared with the uniaxial compression test，the average compressive strength of the rock under constant lower limit cyclic loading and unloading increased by 6.5%，while the increase under variable lower limit cyclic loading and unloading was not significant. The average ratio of Felicity decreased continuously with the increase of stress under constant lower limit cyclic loading and unloading，while the ratio of Felicity basically remained unchanged in the later period of variable lower limit cyclic loading and unloading. The evolution trend of the apparent strain field was consistent with the variation characteristics of acoustic emission. Under constant lower limit cyclic loading and unloading，the damage deformation of rock increased gradually before failure，showing the characteristics of continuous increase. However，under cyclic loading and unloading of the variable lower limit，the damage strain was relatively dispersed in the early stage of loading and unloading. It was not until the stress exceeds 66% of the peak strength that the large apparent strain points of the rock were dispersed and rapidly concentrated，and the local regional deformation increased sharply，showing the characteristics of abrupt change，and the samples showed severe brittle failure，which should be paid attention to in practical engineering.

Key words： rock mechanics red sandstone cyclic loading and unloading acoustic emission digital image correlation damage evolution

引用本文:

王天佐1，2，3，王春力1，2，3，薛飞1，2，3，王林翔1，2，3，薛梦雅1，2，3. 不同循环加卸载路径下红砂岩声发射与应变场演化规律研究[J]. 岩石力学与工程学报, 2022, 41(S1): 2881-2891.
WANG Tianzuo1，2，3，WANG Chunli1，2，3，XUE Fei1，2，3，WANG Linxiang1，2，3，XUE Mengya1，2，3. Study on acoustic emission and strain field evolution of red sandstone under different loading and unloading paths. , 2022, 41(S1): 2881-2891.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0261 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2881

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