| 基于声发射监测的不同加卸荷路径下砂岩破坏前兆信息研究 |
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| 引用本文： | 徐婕,徐宁,蒋景东.基于声发射监测的不同加卸荷路径下砂岩破坏前兆信息研究[J].水利与建筑工程学报,2021,0(1):170-175. |
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| 作者姓名： | 徐婕 徐宁 蒋景东 |
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| 作者单位： | １．河海大学岩土力学与堤坝工程教育部重点实验室，江苏南京２１００９８；２．青岛市莱西水利局，山东青岛２６６６００；３．南京水利科学研究院，江苏南京２１００２４ |
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| 基金项目： | 国家自然科学基金项目(51808191);中央高校基本科研业务费项目(2019B04914)。 |
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| 摘 要： | 为了研究岩爆的孕育演化过程，采用砂岩开展了一系列加卸荷试验，在此过程中利用声发射系统监测岩石破裂的孕育演化过程。试验结果表明，随着围压的增大，方案Ｉ声发射的平静期变得更加明显，裂纹扩展过程由小裂纹的萌生向裂纹聚集过渡。因此声发射平静期可以看作是常规三轴压缩条件下试样破坏的前兆信息。低围压条件下，应力比为０．８～１．０时，剪切带的形成导致试样脆性破坏，不同应力路径下分形值迅速下降。这一阶段声发射的分形值可以用来研究试样在不同应力路径下的破坏前兆。方案Ⅱ的分形值递减率最高，方案Ⅲ次之，方案Ⅰ的分形值递减率最低。在高围压条件下，当时间比大于０．８时，卸荷路径下砂岩试样的分形值迅速降低，表明随时间比变化的分形值可以用于高围压条件下岩石破坏的预测。
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| 关 键 词： | 岩爆 声发射监测 极点对称模态分解方法 |
Research on Precursor Information of Sandstone Failure Under Different Loading and Unloading Paths Based on Acoustic Emission Monitoring |
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| XU Jie,XU Ning,JIANG Jingdong.Research on Precursor Information of Sandstone Failure Under Different Loading and Unloading Paths Based on Acoustic Emission Monitoring[J].Journal of Water Resources Architectural Engineering,2021,0(1):170-175. |
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| Authors: | XU Jie XU Ning JIANG Jingdong |
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| Affiliation: | (Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Laixi Water Conservancy Burea of Qingdao,Shandong 266600,China;Nanjing Hydraulic Research Institute,Nanying,Jiangsu 210024,China) |
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| Abstract: | To analyze the evolution process of rock burst,sandstone was used to carry out a series of loading and unloading tests.During this process,the acoustic emission system was used to monitor the evolutionary process of rock failure.The test results show that the quiet period of the acoustic emission of Scheme I becomes more obvious as the confining pressure increases.The process of crack growth transitions from small crack initiation to crack aggregation.Therefore,the quiet period of acoustic emission can be regarded as the precursor information of specimen failure under the conventional triaxial compression.Under the low confining pressure,when the stress ratio is 0.8~1.0,the formation of shear band leads to the brittle failure of the sample,and the fractal value decreases rapidly under different stress paths.The fractal value of acoustic emission at this stage can be used to analyze the failure precursor of the specimen under different stress paths.The decreasing rate of the fractal values of Scheme II was the highest,followed by that of Scheme III,and the decreasing rate of Scheme I was the lowest.Under the high confining pressure,when the time ratio is greater than 0.8,the fractal value of the sandstone sample under the unloading path decreases rapidly decreases,which indicates that the fractal value change with the time ratio can be used to predict the rock failure under high confining pressure. |
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| Keywords: | rock burst acoustic emission monitoring extreme-point symmetric mode decomposition method |
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