中文摘要：

多孔材料的水渗透性在土木工程中有着广泛的应用,水渗透系数是材料耐久性设计和评估的关键参数.将多孔材料细观结构模拟与随机行走方法相结合,提出了多孔材料水渗透系数预测的数值方法.基于数值结果,给出了随机行走粒子数和对应于不同初始种子数的多孔材料细观结构模拟次数的合理值.通过与文献中四组代表性的结果比较,初步验证了数值方法的有效性.最后分析了颗粒尺寸分布对多孔材料水渗透系数的影响,发现水渗透系数与比表面积的平方近似成反比.

英文摘要：

The water permeability of porous materials has wide applications in various aspects of civil engineering and the water permeability coefficient is a key parameter for the durability design and assessment of materials.By combining the mesostructural simulation of porous materials with the random walk method,a numerical method is presented for predicting the water permeability coefficient of porous materials.Based on the numerical results,the number of random walk particles and the number of simulated mesostructures of porous materials with different initial seeds are given.By comparing with four sets of representative results reported in the literature,the validity of this numerical method is preliminarily verified.Finally,the effect of the particle size distribution on the water permeability coefficient of porous materials is analyzed.It is found that the water permeability coefficient is approximately reversely proportional to the specific surface area.