不同石砾条件对土壤水分入渗的影响

Influences of Different Gravel Conditions on Soil Water Infiltration

运用室内人工模拟的方法，对黔中喀斯特地区几种不同配比的白云岩土石混合样进行了土壤水分入渗的试验。结果表明：（1）石砾含量和砾径的增加均能加速土壤湿润峰下移速率。（2）容重较大（1.3g／cm3）的土样土壤湿润峰下移速率和渗透系数高于容重较小（1．1g／cm3）的土样；但当石砾含量为80％时，容重对土壤水分渗透系数的影响差异不显著。（3）在砾径为2～3mm、3～5mm时，石砾含量与土壤渗透性能呈正相关趋势。但砾径为5～10mm时，除了80％石砾含量的土样下渗曲线明显较高以外，土壤容重和石砾含量对土壤渗透性影响差异较小。

Using indoor artificial simulation method to conduct soil water infiltration experiments in mixed samples of dolomite with different ratios collected from central Guizhou karsts region. The results showed that with the increasing of gravel content and gravel diameter, the soil wetting front descend speed raised. The soil wetting front descend speed and the permeability coefficient of soil sample with larger bulk density （1.3 g/cm3） were higher than that of soil sample with smaller bulk density （1.1 g/cm3）, but the soil Water permeability coefficient was not influenced by bulk density when gravel content was 80%. When gravel diameter was during 2-3 mm or 3-5 mm, there was positive correlation between gravel content and soil infiltration. But when the gravel diameter was 5＋10 ram, except the infiltration curve of sample with 80% gravel content was obvious higher, the differences in influence of gravel content or soil infiltration on soil infiltration was small.