仉文岗, 孟凡胜, 卢志堂, 等. 2021. 含缺陷空间变异性岩体裂纹扩展的近场动力学模拟[J]. 工程地质学报, 29(3): 702-710. doi: 10.13544/j.cnki.jeg.2021-0025.
    引用本文: 仉文岗, 孟凡胜, 卢志堂, 等. 2021. 含缺陷空间变异性岩体裂纹扩展的近场动力学模拟[J]. 工程地质学报, 29(3): 702-710. doi: 10.13544/j.cnki.jeg.2021-0025.
    Zhang Wengang, Meng Fansheng, Lu Zhitang, et al. 2021. Peridynamics simulation of crack propagation in spatially variable rock mass with defects[J]. Journal of Engineering Geology, 29(3): 702-710. doi: 10.13544/j.cnki.jeg.2021-0025.
    Citation: Zhang Wengang, Meng Fansheng, Lu Zhitang, et al. 2021. Peridynamics simulation of crack propagation in spatially variable rock mass with defects[J]. Journal of Engineering Geology, 29(3): 702-710. doi: 10.13544/j.cnki.jeg.2021-0025.

    含缺陷空间变异性岩体裂纹扩展的近场动力学模拟

    PERIDYNAMICS SIMULATION OF CRACK PROPAGATION IN SPATIALLY VARIABLE ROCK MASS WITH DEFECTS

    • 摘要: 天然岩体内部含有微裂纹,其裂纹的发展贯通机制一直是岩石力学研究的热点问题。此外,岩体物理力学参数的空间变异性,也会影响其强度及破坏演化过程。本文采用了一种新的随机近场动力学方法(RPD),并对含缺陷岩体单轴压缩下的裂纹发展进行模拟,该方法结合了近场动力学方法在模拟裂纹发展及随机场方法在表征材料参数空间变异性方面的优势,使所建模型更接近真实岩体状态。利用MATLAB编程并依托含单一倾斜预制裂缝模型进行了计算程序的准确性验证。结果表明,所采用的随机近场动力学方法可以很好地模拟裂纹发展过程,预制裂缝倾角对后续裂纹发展有较大影响。此外,不考虑岩体物理力学材料参数空间变异性的存在时,会大大低估裂纹发展速度。

       

      Abstract: Rock mass in the natural state generally contain micro-cracks. As a result,mechanism for the initiation,propagation,development and penetration of cracks in rock mass has always been a hot research topic in rock mechanics. In addition,the spatial variability characteristics of physical and mechanical parameters of rock mass can also affect the strength of rock samples as well as the failure process. In this paper,a new random peridynamics method(RPD) is proposed to simulate the crack propagation and the development process of cracked rock mass under uniaxial compression. This method combines the use and advantages of the peridynamics method in simulating crack development and the random field method in characterizing the spatial variation of material parameters. The presented numerical framework can produce simulation results of well agreement with the real rock mass state. MATLAB is adopted to verify the accuracy of the inclined prefabricated crack modeling. The results show that the proposed method can simulate the crack development process well. In addition,it is proved that the prefabricated crack inclination has great influence on the subsequent crack development. Furthermore,the evolution velocity can be greatly underestimated if the spatial variability characteristic of rock mass material parameters is neglected. Therefore,it is of great importance to determine the reasonable values of random field parameters,especially the coefficient of variation and the horizontal fluctuation range,for determining the strength and damage of rock mass under uniaxial compression.

       

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