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原型监测表明面板堆石坝一般存在比较显著的流变现象。针对不同文献给出的堆石料三维剪切流变速率计算式存在差异,笔者以3参数指数流变模型为例对堆石料三维流变速率进行了研究。假设体积流变和剪切流变变化规律不同,首先推导了三维体积流变速率计算公式,然后依据Prandtl-Reuss流动法则可以由Mises屈服函数作为塑性势函数推导获得。为此,采用关联流动法则,同时假设塑性势函数为Mises屈服函数,导出了堆石料三维剪切流变速率计算式。通过将三维流变速率计算式退化为单轴流变速率计算式进行合理性分析,分析表明,本文导出的三维流变速率计算式理论上是严谨的,由此指出相关文献给出的流变速率计算式理论上不严谨。
The prototype monitoring shows that there are obvious rheological phenomena in CFRD. According to the different literature, there are some differences in the calculation formulas of the three-dimensional shear rheology of rockfill materials. Three-parameter exponential rheological model is taken as an example to study the three-dimensional rheological rate of rockfill materials. Assuming that the laws of volume flow and shear rheology are different, the three-dimensional volumetric flow rate formula is deduced first and then can be derived from the plastic potential function of the Mises yield function according to the Prandtl-Reuss flow rule. For this reason, the correlation flow rule is adopted, and the plastic potential function is assumed to be the Mises yield function. The formula for calculating the three-dimensional shear rheological rate of rockfill materials is derived. By analyzing the calculation formula of the three-dimensional rheological rate to uniaxial rheological rate, the analysis shows that the calculation formula of the three-dimensional rheological rate derived in this paper is rigorous in theory, and the rheological speed The rate formula is not rigorous in theory.