首页> 中文期刊> 《中南大学学报(自然科学版)》 >考虑节理影响的岩体非线性流变模型

考虑节理影响的岩体非线性流变模型

             

摘要

To study the whole creep process of jointed rock, nonlinear viscous element and joint fissures plastic body were introduced, and then combined with classical Burgers model in series to gain a new composite creep model. 1D and 3D creep constitutive equation of the composite creep model were deduced. By using the composite creep model and the classical Burgers model to fit with the whole process of rock specimen creep curve, creep parameters of the models were derived. The results show that the composite creep model produces better fitting results than the classical Burgers model. It can not only fully reflect the early and steady creep process, but also well present the accelerating creep process of the rock specimen. Meanwhile, it can also reflect the influence of joint fissures on creep.%为研究节理岩体蠕变全过程,引入非线性黏性元件和节理裂隙塑性体,并将其与传统的伯格斯模型串联,得到一种新的复合流变模型.推导该模型一维和三维蠕变本构方程,并运用该复合模型及传统伯格斯模型分别对岩石试样蠕变实验全过程曲线进行辨识,得到模型的各项蠕变参数.研究结果表明:复合流变模型对试验数据的拟合结果明显优于传统伯格斯模型的拟合结果.该模型不仅能充分反映岩石试样的初期蠕变和稳定蠕变过程,而且能很好地描述加速蠕变过程,同时又能体现节理裂隙对蠕变的影响.

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