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开展了宜巴高速峡口隧道灰岩三轴压缩蠕变试验与分析,结果表明灰岩具有明显的非线性蠕变变形特性。基于修正的Rabotnov损伤理论,建立能够综合反映时间和应力水平影响的损伤表达式,将其引人到蠕变经验模型中,从而得到峡口隧道灰岩地蠕变损伤力学模型,该模型较好地解释了应力大小和时间与损伤演变的关系,并能反映岩体流变过程中初始损伤和稳态损伤的发展。采用ABAQUS提供的Drucker-Prager屈服准则,通过子程序将非线性蠕变损伤本构模型引入ABAQUS,并结合一个灰岩三轴蠕变试验对提出的模型进行验证,数值计算得到的流变时程曲线与试验曲线较为一致,表明模型合理可行。
The triaxial compression creep test and analysis of the limestone in Yixia tunnel of Yiba expressway was carried out. The results show that the limestone has obvious nonlinear creep deformation characteristics. Based on the modified Rabotnov damage theory, a damage expression, which comprehensively reflects the influence of time and stress level, is established and introduced into the creep empirical model to obtain the creep damage mechanics model of limestone in Xiakou tunnel. Explain the relationship between stress magnitude and time and damage evolution, and reflect the initial damage and steady damage during rock rheology. Using the Drucker-Prager yield criterion provided by ABAQUS, the constitutive model of nonlinear creep damage is introduced into ABAQUS by a subroutine. The proposed model is verified by a triaxial creep test of limestone. The rheological time series The curves are in good agreement with the experimental curves, indicating that the model is reasonable and feasible.