深部岩石黏弹塑性本构模型与数值模拟方法

    Viscoelastic plastic constitutive model and numerical simulation method for deep rock

    • 摘要: 深部原位赋存环境致使深部岩石具有明显的黏弹塑性变形行为。针对矿井深部岩石的黏弹塑性变形行为,基于一致性导数推导了Abel黏壶本构方程,并建立了三维黏弹塑性元件本构模型。采用局部微分代数方程组的残差形式及其隐式方法进行求解,同时依托MFront,MTest与FEniCS软件进行了数值模拟实现。利用解析解与实验数据验证了本构模型的可靠性,且具有较好的收敛效果。模拟实验表明:本构模型可以很好的描述围压变化条件下的岩石三轴压缩及其扩容效果。通过控制本构模型的相关参数可以有效的分析蠕变过程中的黏弹性变形行为。

       

      Abstract: The deep in-situ occurrence environment leads to obvious viscoelastic-plastic deformation behavior of deep rocks. In view of the viscoelastic-plastic deformation behavior of deep rocks in the mine, the constitutive equation of Abel visco-pot is derived based on the consensus derivative, and a three-dimensional constitutive model of viscoelastic-plastic components is established. The residual form of the local differential algebraic equation and its implicit method are used to solve the problem, and the numerical simulation is carried out by relying on MFront, MTest and FEniCS software. The analytical solution and experimental data are used to verify the reliability of the constitutive model, and it has a good convergence effect. Simulation results show that the constitutive model can well describe the triaxial compression and expansion effect of rock under the condition of confining pressure. By controlling the relevant parameters of the constitutive model, the viscoelastic deformation behavior during creep can be effectively analyzed.

       

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