单轴压缩下岩石裂纹扩展应力阈值识别与验证

doi:10.13722/j.cnki.jrme.2022.0232

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摘要准确识别岩石在单轴压缩变形破坏过程中几个典型阶段的应力阈值，能更好地理解岩石渐进破坏过程中内部裂纹扩展力学行为和岩石破坏机制。通过对5种岩石开展单轴压缩试验，在裂纹体积应变法的基础上引入岩石裂纹轴向应变和裂纹径向面积应变2个参数，并结合声发射监测手段对5种岩石的应力阈值进行识别。依据岩石破坏时裂纹径向面积应变曲线斜率的关系，把岩石分成类型I和类型II岩石。研究表明，对于类型I和类型II岩石，分别利用其裂纹轴向应变和裂纹径向面积应变曲线特征点能较准确识别出岩石裂纹稳定扩展应力、裂纹不稳定扩展应力以及岩石裂纹相互贯通应力阈值，其结果与利用声发射特征现象所识别的应力阈值相近。该方法合理解释了利用体应变法、裂纹体积应变法与声发射法识别的应力阈值不匹配现象，实现了岩石压缩过程中利用应力、应变数据与声发射数据对应力阈值识别结果的一致性。

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	李地元
	陈昱达

关键词 ：岩石力学, 应力阈值识别, 声发射, 裂纹体积应变, 体应变

Abstract：Several typical stress threshold stages exist for rock materials during uniaxial compressive deformation failure process. It can help us to understand the mechanical behavior of internal crack propagation and rock failure mechanism in the progressive failure process. Two parameters，crack radial area strain and crack axial strain，are introduced based on the crack volumetric strain method in this paper. By conducting uniaxial compressive tests on five kinds of rocks，the proposed method and acoustic emission monitoring method are used to identify the stress thresholds of the five kinds of rock under uniaxial compression. According to the slope of the crack radial area strain curve when the rock breaks，the rock types are classified into type I and type II rocks. The testing results indicate that the stress threshold can be well identified by using the axial crack strain and radial area strain of the crack for type I and type II rocks respectively. It can accurately identify the stable crack development stress ，crack instability development stress ，and the crack connectivity stress of rock. Meanwhile，the results are similar to the stress threshold identified by the acoustic emission method. The mismatching phenomenon of stress thresholds identified by volumetric strain method，crack volumetric strain method and acoustic emission method is explained reasonably，the consistency of stress thresholds identification results using stress and strain data and acoustic emission data in the process of rock compression is realized.

Key words： rock mechanics stress threshold identification acoustic emission crack volumetric strain volumetric strain

引用本文:

李地元，陈昱达. 单轴压缩下岩石裂纹扩展应力阈值识别与验证[J]. 岩石力学与工程学报, 2023, 42(S1): 3121-3130.
LI Diyuan，CHEN Yuda. Identification and verification of stress threshold for rock crack propagation under uniaxial compression. , 2023, 42(S1): 3121-3130.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0232 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3121

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