一种新的非线性粘弹塑性流变模型

New Non-linear Visco-elastico-plastic Rheological Model of Rock

根据岩石蠕变条件下裂纹扩展特性,在前人研究的基础上建立了一个能反映加速蠕变阶段的非线性粘弹塑性流变模型,该模型能描述蠕变变形的3个阶段,即初始蠕变、稳态蠕变和加速蠕变。结合锦屏二级水电站深埋长大引水隧洞板岩剪切流变试验结果,通过编写变尺度法(DFP)算法,辨识流变模型参数,结果表明作者提出的非线性粘弹塑性流变模型是正确的。

According to the characteristic of the spreading crack under the condition of rheological rock, the authors establish a non-linear visco-elastico-plastic rheological model on the basis of presented models. The model can reflect three stages of the rheological deformation, namely, initial creep, steady creep and acceleration creep. Combing the shear rheological experiment result of the water transfer tunnel at Jingping Ⅱ Hydroplant, the authors compile a arithmetic program of DFP（davidon-fletcher-powell） and identify the parameters of rheological model. Accordingly, the result validates that the non-linear visco-elastic-plastic rhcologieal model is right.