基于饱依丁-汤姆逊模型的软岩损伤蠕变模型

为更加准确地描述深部软岩的蠕变全过程,以饱依丁-汤姆逊模型为基础,将损伤变量引入到蠕变方程中,并构造了可描述加速蠕变阶段的模型元件,通过串联得到了新的蠕变模型。结果表明:该模型能够较好地描述软岩的衰减蠕变、稳态蠕变、加速蠕变阶段。用该模型对泥质页岩的蠕变试验结果进行数据拟合对比,结果显示该模型的拟合曲线与实验曲线基本吻合,拟合度为0.99733,能够很好地反映出软岩蠕变的特性,适合用于描述深部软岩的蠕变行为。

Creep model of soft rock considering creep damage based on Poyting-Thomson model

In order to describe the whole process of creep of deep soft rock more accurately,based on the Poyting-Thomson model,introducing the damage variable into the creep equation,and constructing a model element that can describe accelerated creep stage,finally,a new creep model is gotten through series connection.The model can well describe the attenuation creep stage,steady creep stage and the accelerated creep stage of the soft rock.This model is used to fit the data of creep test of shale.It shows that the fitting curve of the model is basically consistent with the experimental curve,the model well reflects the creep characteristics of soft rock,fitting degree is 0.99733,and it is suitable for describing the creep behavior of deep soft rock.