基于核磁共振技术的白云岩微观损伤致劣机制研究

doi:10.13722/j.cnki.jrme.2021.0283

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摘要为探究静力加载下白云岩的微观损伤致劣机制，结合核磁共振驰豫机制和谱驰豫信号特征，提出一种多谱峰正态数学模型；同时，通过三轴压缩试验前后的核磁共振检测信号对模型进行验证，结合试验前后核磁共振驰豫信号特征及核磁成像技术，从核磁共振弛豫谱信号和孔隙孔径分布特征分析岩石内部微观孔隙结构的损伤致劣机制。结果表明：(1) 所提出的数学模型能够较为完整的表征核磁共振驰豫信号信息，反演拟合度 = 0.99，结合岩石宏观破坏时的核磁驰豫信息，利用所提出的数学模型可定量评价岩石的损伤状态；(2) 通过岩石压缩破坏试验前后的核磁共振检测结果对比分析，岩石破坏前，岩样核磁共振检测呈现典型的3个谱峰，小孔隙和中孔隙连通性较好，大孔隙分布较少；岩石宏观破坏后，中、大孔隙连通性显著增强，中孔隙和大孔隙具有典型“靠拢–合并”特征，破坏后大孔隙和中孔隙谱谱峰面积与总谱峰面积之比超过90%，宏观损伤值D＞0.9；(3) 岩石在不同围压作用下破坏时，内部孔隙结构的核磁驰豫信号特征表现基本一致，均为大孔隙分布为主导，破坏时的孔径分布差异与围压关系不显著。研究成果可为科学定量评价岩体工程的损伤状态提供参考依据。

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	秦庆词1
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	李克钢1
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	李明亮1
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	李旺3
	刘博1
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关键词 ：岩石力学, 核磁共振(NMR), 微观损伤, 孔隙结构, 损伤机制, 多谱峰正态模型

Abstract：In order to explore the microscopic damage and deterioration mechanism of dolomite under static loading，combining the NMR relaxation mechanism and spectrum relaxation signal characteristics，a multi-peak normal mathematical model is proposed，at the same time，the NMR before and after the triaxial compression test Resonance detection signals verify the model. Combining the characteristics of NMR relaxation signals before and after the test and NMR imaging technology，the damage and deterioration mechanism of the microscopic pore structure in the rock is analyzed from the NMR relaxation spectrum signal and the pore size distribution characteristics. The results show that：(1) The proposed mathematical model can more completely characterize the NMR relaxation signal information，and the inversion fit is = 0.99. Combined with the NMR relaxation information during rock macroscopic failure，the proposed mathematical model can be used to Quantitatively evaluate the damage state of the rock. (2) Through the comparative analysis of the NMR test results before and after the rock compression failure test，the NMR test of the rock sample showed three typical peaks before the rock failure，and the small pores and mesopores have good connectivity，The distribution of large pores is less，after the rock is macroscopically destroyed，the connectivity of the medium and large pores is significantly enhanced，and the mesopores and large pores have typical“close-merge”characteristics. After the failure，the T2 spectrum peak area，and total spectrum The peak area ratio exceeds 90%，and the macroscopic damage value D＞0.9. (3) When the rock is damaged under different confining pressures，the nuclear magnetic relaxation signal characteristics of the internal pore structure are the same，and the distribution of large pores is dominant. The relationship between the difference in pore size distribution and the confining pressure is not significant. The research results will provide a reference for the scientific and quantitative evaluation of the damage state of rock mass engineering.

Key words： rock mechanics nuclear magnetic resonance(NMR) microscopic damage pore structure damage mechanism multi-spectral peak normal model

引用本文:

秦庆词1，2，李克钢1，2，李明亮1，2，李旺3，刘博1，2. 基于核磁共振技术的白云岩微观损伤致劣机制研究[J]. 岩石力学与工程学报, 2022, 41(S1): 2944-2954.
QIN Qingci1，2，LI Kegang1，2，LI Mingliang1，2，LI Wang3，LIU Bo1，2. Study on the deterioration mechanism of dolomite microscopic damage based on NMR technique#br#. , 2022, 41(S1): 2944-2954.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0283 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2944

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