| 不同加载速率下花岗岩和砂岩声发射特征研究 |
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| 引用本文： | 周洋,王艳波,张腾,雷泉龙,仲静文.不同加载速率下花岗岩和砂岩声发射特征研究[J].路基工程,2022,0(4):83-89. |
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| 作者姓名： | 周洋 王艳波 张腾 雷泉龙 仲静文 |
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| 作者单位： | 南京市水利规划设计院股份有限公司， 南京 100022 |
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| 摘 要： | 通过单轴压缩试验，研究了花岗岩和砂岩在不同加载速度（0.05、0.10、0.15 mm/min）时的应力发展规律、强度变化特征以及声发射时空变化特征。结果表明:随加载速度的提高，花岗岩和砂岩的应力-时间曲线发展特征均明显发生改变，从0.05 mm/min增加到0.10 mm/min时，岩石应力变化幅度较大。花岗岩的单轴抗压强度随着加载速度的提升先是快速增大后基本不变；砂岩的单轴抗压强度是随着加载速度的提升逐渐减小的。花岗岩的振铃计数随着加载速度的提高总体上是减小的，而砂岩的振铃计数随加载速度的提高是在减小的。累计振铃计数特征表现为花岗岩随加载速度是先增加后减小，砂岩是逐渐增大的，并且在0.15 mm/min时砂岩的累计振铃计数大于花岗岩。累计能量是随着加载速度提高而减小，砂岩的累计能量大于花岗岩。花岗岩的声发射事件数水平是随着加载速度提高在破坏前先减小，破坏时变化较小，频度在全过程是逐渐减小；砂岩的声发射事件数水平在破坏前是逐渐增大，破坏时则变化不大，频度在全过程是逐渐减小。
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| 关 键 词： | 不同加载速度 单轴抗压强度 声发射 花岗岩 砂岩 |
| 收稿时间： | 2022-04-27 |
Study on Acoustic Emission Characteristics of Granite and Sandstoneunder Different Loading Rates |
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| Abstract: | Through the uniaxial compression tesr, the stress development law, strength variation characteristics and temporal and spatial variation characteristics of acoustic emission of granite and sandstone at different loading rates (0.05, 0.10, 0.15 mm/min) are studied. The results show that the stress-time curve development characteristics of granite and sandstone change significantly with the increase of loading rate, and the change of rock stress is larger when increasing from 0.05 mm/min to 0.10 mm/min. The uniaxial compressive strength (USC) of granite firstly increased rapidly with the increasing loading rate and then remained basically unchanged. The USC of sandstone was gradually decreased with the increase of loading rate. The ringing count of granite is generally decreasing, while the ringing count of sandstone is decreasing with the increase of loading rate. The cumulative ringing counts are characterized by increasing and then decreasing with increasing loading rate for granite and gradually increasing for sandstone, and the cumulative ringing counts for sandstone are larger than those for granite at 0.15 mm/min. The cumulative energy is decreasing with the increase of loading rate, and the cumulative energy of sandstone is larger than that of granite. The AE event level of granite decreases with the increase of loading rate before the damage, the change is small at the damage, and the frequency is gradually decreasing in the whole process; the AE event level of sandstone is gradually increasing before the damage, the change is small at the damage, and the frequency is gradually decreasing in the whole process. |
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