黏性土体冲蚀特性研究是预防水工建筑物破坏的关键。采用冲蚀函数测定仪(EFA)对重塑黏性土进行冲刷试验。根据试验结果,对Wilson模型和过剪应力模型中冲刷参数之间相关关系进行了研究,并分析起动切应力与含水量、干重度和黏聚力之间的关系。此外,使用决定系数R2和归一化目标函数NOF对2种模型的拟合优度进行了评价。试验结果表明:2个模型的冲刷参数之间具有较好的相关性;已知一个冲刷参数,即可通过回归方程得到其余冲刷参数;并且起动切应力与含水量、干重度和黏聚力呈线性关系。Wilson 模型的R2和NOF优于过剪应力模型,因此Wilson模型预测黏性土的合理性和准确性均高于过剪应力模型。
Abstract
Researching the erosion characteristics of cohesive soil is the key to preventing hydraulic structures from destructing. Erosion experiments of remolded cohesive soil were carried out by the Erosion Function Apparatus (EFA), and according to the experimental results, the relations between erodibility parameters in both Wilson model and excess shear stress model were studied. The relations of critical shear stress against water content, dry unit weight and cohesion in the two models were examined. In addition, the goodness of fit of the two models was evaluated using determination coefficient R2 and normalized objective function NOF. Results revealed a power function relationship between the erodibility parameters of the two models and a linear relationship between critical shear stress and soil parameters. Given an erosion parameter, the other erosion parameters could be obtained through regression. The Wilson model has better R2 and NOF than excess shear stress model. Therefore, the rationality and accuracy of Wilson model in predicting the erosion rate of cohesive soil are higher than that of excess shear stress model.
关键词
冲刷参数 /
黏性土 /
Wilson模型 /
过剪应力模型 /
参数相关关系
Key words
erosion parameters /
cohesive soil /
Wilson model /
excess shear stress model /
correlations among parameters
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