表层土渗透系数空间变异与随机模拟研究

在汉江遥堤典型堤段对堤后200 m?100 m范围内表层土取样进行渗透性试验，基于试验结果分析了土体渗透系数的随机性和结构性的空间变异特征，结果表明细砂渗透系数在水平方向具有各向同性，空间结构可用指数模型描述。采用转向带法进行渗透系数随机场模拟，从基本统计量、空间结构等方面进行的分析表明，转向带法模拟结果保持了原随机场的统计特性，具有较好的收敛性。

Study of spatial variability and stochastic modeling of surface soil permeability

The surface soil permeability is tested on the soil samples taken from a region of 200 m by 100 m in a typical stretch of Yaodi Dyke of Hanjiang River. Taking the test results as samples, both random and structural spatial properties of soil permeability are analyzed. It is shown that the permeability of sandy soil in the research area is horizontally isotropic; and the exponential model can describe its spatial correlation structure. Turning bands method is adopted to simulate the permeability random field. The basic statistics and spatial structure of the simulated results are checked. It is shown that the generated realizations of the turning bands method preserve the statistical properties of the original random field; and the turning bands method has acceptable convergence.