基于数字图像相关和声发射的岩质锁固段破坏试验研究
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TU 457

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国家自然科学基金(41877254);四川省科技计划项目(2019YJ0534)


Experimental study on failure test of rock locked section based on Digital Image Correlation and Acoustic Emission
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    摘要:

    针对突发性强、隐蔽性强、监测预警难的锁固段型岩质滑坡,开展了对该类滑坡稳定性起关键控制作用的“锁固段”物理模型试验研究。首先,构建 “三段式”锁固段均质物理模型,采用声发射(Acoustic Emission, AE)和数字图像相关技术(Digital Image Correlation, DIC)捕获锁固段模型变形破坏全过程的微破裂事件AE信号和高清数字图像。其次,结合声发射b值统计分析和DIC数字图像微应变定量分析锁固段表面裂纹的萌生、扩展和演化,查明锁固段损伤破裂的时空演化规律。最后,采用高斯混合模型(GMM)对锁固段微破裂模式进行非监督聚类分析,并采用支持向量机(SVM)建立微破裂模式分类依据。结果表明:(1)锁固段变形破坏过程的声发射b值曲线具有明显的阶段性,且有明显的破坏前兆特征;(2)内部微破裂的孕育发展到一定阶段出现大裂纹扩展,释放频率更低、幅度更大的高能量信号,可作为其破坏前兆;(3)声发射信号蕴含破裂的丰富信息,GMM可实现微破裂机制(张拉和剪切)的分类,具备高RA和低AF特征的剪切破裂声发射信号的高频出现也可作为其破坏前兆。

    Abstract:

    For rock landslides of the locking section with strong suddenness, concealment and difficulty in monitoring and warning, experimental study has been conducted on the physical model of the “locking section”, which plays a key role in controlling the stability of its landslides. Firstly, a “three stage’’ homogeneous physical model of the locking section is constructed, and the AE signal and high-definition digital images of the micro-rupture event during the deformation and failure of the locking section model is captured using Acoustic Emission (AE) and Digital Image Correlation (DIC) techniques. Secondly, combined with the statistical analysis of acoustic emission b value and DIC digital image micro-strain quantitative analysis of the emergence, extension and evolution of surface cracks in the locking section, the spatiotemporal evolution law of damage and rupture in the locking section is ascertained. Finally, the Gaussian Mixture Model (GMM) is used to perform an unsupervised clustering analysis of the locking section microrupture patterns and the Support Vector Machine (SVM) is used as a basis for the classification of the microrupture patterns. The results show that: (1) The acoustic emission b-value curve of the deformation and failure process of the locked section has obvious stages and failure precursor characteristics. (2) The development of internal micro-rupture gestation to a stage where large crack extensions occur, released high energy signals of lower frequency and greater amplitude, which can be used as precursors to its destruction. (3) The acoustic emission signal contains a wealth of information on rupture, and GMM enables the classification of micro-rupture mechanisms (tension and shear), and the high frequency occurrence of shear rupture acoustic emission signals with high RA and low AF characteristics can also be used as a precursor to its failure.

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范杰,朱星,霍冬冬,等. 基于数字图像相关和声发射的岩质锁固段破坏试验研究[J]. 科学技术与工程, 2021, 21(36): 15581-15590.
Fan Jie, Zhu Xing, Huo Dongdong, et al. Experimental study on failure test of rock locked section based on Digital Image Correlation and Acoustic Emission[J]. Science Technology and Engineering,2021,21(36):15581-15590.

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  • 收稿日期:2021-04-19
  • 最后修改日期:2021-12-25
  • 录用日期:2021-08-27
  • 在线发布日期: 2022-01-04
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