【摘要】 为更好地描述岩石蠕变行为,特别是第2和第3期蠕变过程,基于岩石蠕变机理,在粘塑性元件中引入塑性强化函数和粘性弱化函数,建立了岩石的非线性蠕变模型.对圆柱形砂岩试样进行的单轴压缩蠕变试验表明,所建立的模型对试验数据的拟合程度较高(相关系数达0.98),能较好地描述岩石蠕变的全过程.更多还原

【Abstract】 To more reasonably describe the creep behavior of rock,especially the 2nd and 3rd stages of rock creep,a non-linear creep model of rock was established based on the creep mechanism of rock and introducing a plasticity strengthening function and a viscosity weakening function into the visco-plasticity model.The result of a creep experiment on cylindrical sandstone specimens under uniaxial compression shows that the established model can fits the experimental result well,the correlation coefficients being greater than 0.98.The non-linear creep model can describe the whole process of rock creep exactly.更多还原