泾阳南塬黄土边坡饱和渗透系数变异性分析

[目的]研究泾阳县南塬耕植土下部黄土层饱和渗透系数空间变异性特征,为研究水的渗透对黄土滑坡的影响提供依据。[方法]通过室内变水头渗透试验测定泾阳县南塬54个测试点的垂直饱和渗透系数和水平饱和渗透系数,并用传统统计学和地统计学方法进行分析。[结果]探槽取样区的饱和渗透系数在10~(-2)~10m/d范围之内,平硐取样区的渗透系数明显小于探槽渗透系数值,在10~(-4)~1m/d范围之间。探槽垂直方向空间相关程度中等,变程为5.05,水平方向空间相关程度强,变程为3.50;平硐垂直方向空间相关度中等,变程为17.46,水平方向空间相关程度弱,变程为16.00。[结论]黄土边坡饱和渗透系数的空间变异性较强。

Variability of Saturated Permeability Coefficient of Loess Slopes in South Jingyang Tableland

[Objective] The spatial variability of saturated permeability coefficient of lower layer of cultivated soil was researched to understand the influence of water infiltration on loess landslide in South Jingyang Plateau.[Methods] The horizontal and vertical saturated permeability coefficient of 54 loess samples were measured from the variable head permeability test and analysed using traditional statistics and geostatistics methods.[Results] The saturated permeability coefficient of the trench sampling area was 0.01~10 m/d and the permeability coefficient of the adit sampling area was smaller than that of the trench area, with its range of 0.0001 to 1 m/d. The spatial correlation degree of the vertical direction of the trench sampling area is medium, and the variation range is 5.05; horizontal spatial correlation degree is strong, change range is 3.50. The spatial correlation degree of the vertical direction of the adit is medium, and the variation range is 17.46. For horizontal direction, its correlation is weak with a range of 16.00.[Conclusion] The variability of saturated permeability coefficient in loess slope is larger.