土石混合物入渗性能试验及模拟研究

Experimental and Simulation Study on Infiltration of Soil Rock Mixture

为研究碎石含量与粒径对土壤入渗能力的影响,通过向自然土壤添加不同粒径、不同含量的碎石,在定水头条件下,研究了碎石含量和粒径对其入渗能力的影响,并通过Horton模型、Philip模型、Kostiakov模型及修正的Kostiakov模型对入渗率进行拟合,确定土石混合物入渗过程的适用模型。研究结果表明,相同碎石粒径条件下,累积入渗量与碎石含量呈正相关关系;相同碎石含量条件下,碎石粒径与累积入渗量呈负相关关系;通过Horton模型、Philip模型、Kostiakov模型及修正的Kostiakov模型对入渗率拟合的对比分析,发现修正的Kostiakov模型模拟含碎石土壤入渗率具有较高的精度,适用于试验所选的土石混合物。研究结果可为农业灌溉和水土保持提供参考。

In order to study the influence of gravel content and particle size on soil infiltration capacity,the effect of crushed stone content and particle size on the infiltration capacity was studied by adding different sizes and different contents of gravel to natural soil.Through Horton model,Philip model,Kostiakov model and modified Kostiakov model were used to fit the infiltration rate and determine the suitable model for the infiltration process of soil-rock mixture.The results show that under the same gravel particle size,the cumulative infiltration amount is positively correlated with the crushed stone content;Under the same gravel content,the crushed stone particle size has a negative correlation with the cumulative infiltration.Through the comparative analysis of Horton model,Philip model,Kostiakov model and modified Kostiakov model,it is found that the modified Kostiakov model has high accuracy in simulating the infiltration rate of gravel-bearing soil,and is suitable for the selected soil-rock mixture in this experiment.The research results can provide reference for agricultural irrigation and soil and water conservation.