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Shear Creep Simulation of Structural Plane of Rock Mass Based on Discontinuous Deformation Analysis

机译：基于不连续变形分析的岩体结构面剪切蠕变模拟

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Numerical simulations of the creep characteristics of the structural plane of rock mass are very useful. However, most existing simulation methods are based on continuum mechanics and hence are unsuitable in the case of large displacements and deformations. The discontinuous deformation analysis method proposed by Genhua is a discrete one and has a significant advantage when simulating the contacting problem of blocks. In this study, we combined the viscoelastic rheological model of Burgers with the discontinuous deformation analysis (DDA) method. We also derived the recurrence formula for the creep deformation increment with the time step during numerical simulations. Based on the minimum potential energy principle, the general equilibrium equation was derived, and the shear creep deformation in the structural plane was considered. A numerical program was also developed and its effectiveness was confirmed based on the curves obtained by the creep test of the structural plane of a rock mass under different stress levels. Finally, the program was used to analyze the mechanism responsible for the creep features of the structural plane in the case of the toppling deformation of the rock slope. The results showed that the extended DDA method is an effective one.
机译：岩体结构面蠕变特征的数值模拟非常有用。但是，大多数现有的仿真方法都是基于连续力学的，因此不适用于大位移和变形的情况。 Genhua提出的不连续变形分析方法是一种离散方法，在模拟块体接触问题时具有显着优势。在这项研究中，我们将Burgers的粘弹性流变模型与不连续变形分析（DDA）方法相结合。我们还推导了数值模拟过程中蠕变变形增量随时间步长的递推公式。根据最小势能原理，推导了一般的平衡方程，并考虑了结构面的剪切蠕变变形。还开发了一个数值程序，并根据在不同应力水平下岩体结构面的蠕变试验获得的曲线证实了其有效性。最后，该程序被用来分析在岩石边坡倾覆变形情况下结构面蠕变特征的机理。结果表明，扩展的DDA方法是一种有效的方法。

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  • 来源
    《Mathematical Problems in Engineering》 |2017年第2017期|1582825.1-1582825.13|共13页
  • 作者

    Zhang Guoxin; Lei Zhengqi; Cheng Heng;

  • 作者单位

    China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China;

    China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China;

    China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100038, Peoples R China;

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