岩石粘弹性非定常蠕变方程的参数辨识

近年来,由于力学试验手段和技术的迅速发展,岩石的流变试验的研究也取得了极大的进展。在此基础上,不少学者开始着手探索基于试验结果分析来建立非线性的粘弹性本构模型。作者在页岩蠕变试验数据的基础上,分析了岩石粘弹性变形随应力水平不同和时间发展的变化规律。从元件型本构方程出发验证引入非定常参数的必要性。建立了一维情况下非定常粘弹性模型的蠕变方程,通过理论计算结果与试验结果的对比,发现非定常粘弹性模型比定常粘弹性模型更为准确的反映了岩石的粘弹性变形性能。

Parameter identification of non-stationary creep equation of rocks

In recent years, rock rheological experiment research has been made great progress due to the rapid development of mechanical experiment methods and technologies. So far, many researchers have begun to build nonlinear viscoelastic constitutive model according to experimental data. Based on the creep experimental data of shale, the relationship between stress level, time and viscoelastic deformation disciplines of rock is analyzed. Element constitutive model is adopted to testify the necessity of non-stationary parameters. One-dimensional non-stationary viscoelastic creep equation of rock is given. According to data contrast of theory and experiment, non-stationary viscoelastic constitutive model more accurately reflects the deformation capability of rock than the constant one.