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为了全面描述岩石蠕变全过程,克服线性牛顿体不能准确描述加速蠕变的不足,在引入非线性蠕变体模型基础上,结合流变力学模型理论,定义应力与试件长期强度的比值为加速蠕变速率幂级数n,模型发生加速蠕变时的总蠕变量为蠕变特征长度εc,进而得到一种改进的能够描述岩石黏弹塑性加速蠕变的力学模型。结合东乡铜矿砂质页岩单轴压缩下分级增量循环加卸载蠕变试验,对模型参数的辨识进行解释,并将该模型的蠕变拟合曲线与实验的蠕变曲线进行对比。研究结果表明:该模型能很好地描述了岩石的加速蠕变特性。
In order to fully describe the whole process of rock creep and overcome the shortcoming that linear Newtonian can not accurately describe accelerating creep, based on the introduction of nonlinear creep model and rheological model theory, the ratio of stress to long-term strength of specimen is defined as The accelerating creep rate power series n, the total creep quantity of the model at accelerated creep is the creep feature length εc, and then an improved mechanical model capable of describing the viscoelastic-plastic creep acceleration of rock is obtained. Based on the uniaxial compression and unloading creep test of sandy shale in Dongxiang copper mine, the identification of model parameters is explained and compared with the experimental creep curve. The results show that the model can well describe the accelerated creep characteristics of rocks.