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Crack evolution behavior of rocks under confining pressures and its propagation model before peak stress

围压作用下岩石峰前裂纹演化行为及其扩展模型

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Abstract

The understanding of crack propagation characteristics and law of rocks during the loading process is of great significance for the exploitation and support of rock engineering. In this study, the crack propagation behavior of rocks in triaxial compression tests was investigated in detail. The main conclusions were as follows: 1) According to the evolution characteristics of crack axial strain, the differential stress-strain curve of rocks under triaxial compressive condition can be divided into three phases which are linear elastic phase, crack propagation phase, post peak phase, respectively; 2) The proposed models are applied to comparison with the test data of rocks under triaxial compressive condition and different temperatures. The theoretical data calculated by the models are in good agreement with the laboratory data, indicating that the proposed model can be applied to describing the crack propagation behavior and the nonlinear properties of rocks under triaxial compressive condition; 3) The inelastic compliance and crack initiation strain in the proposed model have a decrease trend with the increase of confining pressure and temperature. Peak crack axial strain increases nonlinearly with the inelastic compliance and the increase rate increases gradually. Crack initiation strain has a linear relation with peak crack axial strain.

摘要

理解岩石在加载过程中的裂纹演化特征及规律对于岩体工程开挖与支护具有重要意义. 本文详 细地研究了围压作用下岩石的裂纹扩展行为, 主要结论如下: 1)依据裂纹轴向应变的演化特征, 围 压作用下岩石的差应力-应变曲线可以分为三个阶段, 分别为线弹性阶段、裂纹扩展阶段及峰后阶段; 2)建立围压作用下岩石的裂纹扩展模型, 并进行了验证, 发现通过理论模型计算得出的理论数据与试 验数据吻合度较高, 验证了裂纹扩展模型可以被用来描述围压作用下岩石的非线性裂纹扩展行为; 3) 裂纹扩展模型中岩石裂纹非弹性柔度和裂纹起裂应变随着围压的增大和温度的升高呈减小趋势. 峰值 裂纹轴向应变随着非弹性柔度的增大呈非线性增大趋势, 其增大速率逐渐降低, 而裂纹起裂应变与峰 值裂纹轴向应变呈线性关系.

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Authors and Affiliations

  1. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Jian-ping Zuo  (左建平)

  2. Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources, Henan Polytechnic University, Jiaozuo, 454003, China

    Yan Chen  (陈岩)

  3. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Jian-ping Zuo  (左建平)

  4. State Key Laboratory of Hydroscience and Hydraulic Engineering, Tsinghua University, Beijing, 100084, China

    Xiao-li Liu  (刘晓丽)

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  1. Jian-ping Zuo  (左建平)
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  2. Yan Chen  (陈岩)
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  3. Xiao-li Liu  (刘晓丽)
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Correspondence to Yan Chen  (陈岩).

Additional information

Foundation item: Project(51622404) supported by Outstanding Youth Science Foundation of the National Natural Science Foundation of China; Projects(51374215, 11572343, 51904092) supported by the National Natural Science Foundation of China; Project(2016YFC0801404) supported by the State Key Research Development Program of China; Project(KCF201803) supported by Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources, Henan Polytechnic University, China; Project supported by Beijing Excellent Young Scientists, China

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Zuo, Jp., Chen, Y. & Liu, Xl. Crack evolution behavior of rocks under confining pressures and its propagation model before peak stress. J. Cent. South Univ. 26, 3045–3056 (2019). https://doi.org/10.1007/s11771-019-4235-z

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  • DOI: https://doi.org/10.1007/s11771-019-4235-z

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