陶瓷透水路面砖渗透系数与孔隙特征的定量关系模型

Quantitative Relationship Model Between Permeability Coefficient and Pore Characteristic of Ceramic Pervious Pavement Brick

利用X射线计算机断层成像及图像三维重构技术获取了陶瓷透水路面砖的孔隙特征参数与渗透系数.基于沿程水头损失及局部水头损失影响因素,选取合适孔隙特征参数,并利用量纲分析法建立了渗透系数与孔隙特征参数的定量关系模型.结果表明:通过统计学检验方法对建立的定量关系模型进行检验,发现所建立模型是合理可靠的;渗透系数受有效孔隙迂曲度、有效孔隙半径均值的影响最大,受有效孔隙比表面积、有效孔隙等效喉道半径及有效孔隙等效喉道长度的影响较小.

The pore characteristic parameters and permeability coefficient of ceramic pervious pavement brick were obtained by using X-ray computed tomography and three-dimensional image reconstruction technology.Based on the influencing factors of frictional head loss and local head loss,suitable pore characteristic parameters were selected,and the quantitative relationship between permeability coefficient and pore characteristic parameters was modeled by using the dimensional analysis.The results show that the established quantitative relationship model is reasonable and reliable as proven by the statistical test method.The permeability coefficient is most influenced by effective pore tortuosity and the mean effective pore radius,and less influenced by the effective pore specific surface,the effective pore equivalent throat radius and the effective pore equivalent throat length.