改进的burgers岩石蠕变模型

基于实测的实验数据分析蠕变曲线的特征,构造出能够表现岩石衰减蠕变和加速蠕变阶段特征的非线性函数,并引入到burgers蠕变本构方程中,得到一个新的非线性蠕变模型,岩石稳定蠕变阶段的非线性渐变过程和加速蠕变阶段蠕变速率的快慢程度可通过调整蠕变参数进行有效地模拟。在较低应力水平时,模型能够有效地刻画岩石的初始蠕变和稳定蠕变;当应力水平超过岩石的长期强度时,能够反映加速蠕变特性。利用该模型对试验数据拟合的结果表明,对蠕变模型计算结果和试验结果的比较,表明该模型能够很好的描述蠕变曲线中的初始衰减蠕变阶段稳态蠕变阶段和加速蠕变阶段,证明了该模型的正确性和合理性。

Modified Burgers Rock Creep Model

The experimental data analysis based on measured characteristics of creep curves constructed to accelerate the performance of rock creep and creep stage attenuation characteristics of the nonlinear function into burgers creep constitutive equation, get a new nonlinear creep model, rock steady creep stage nonlinear gradual process and accelerate the rate of creep creep speed level can be adjusted to effectively simulate creep parameters. At low stress levels, the model can effectively portray the initial creep and stability of rock creep; when the stress level exceeds the long - term strength of the rock, to reflect accelerated creephrough the fitting of the obtained test data to de- termine material parameters on the creep model calculations and experimental results of the comparison indicates that the model can well describe the creep curve in the initial stages of decay and steady creep creep creep speed stage to prove correctness and rationality of the model.