充填复垦土壤水分竖直运动模拟研究

Simulation Research on Water Upright Movement in Reclaimed Soil by Filling

应用直立柱状模型模拟研究了煤矸石和粉煤灰两种充填模式下覆土层土壤水分运动特点,把充填复垦土壤水分运动过程分为3个阶段和4个层次,并通过与全部充填土壤情况下水分动态对比找出其差异性.把监测数据与应用竖直一维动力学模型计算得到的水分分布规律比较,找出了充填层对覆土层土壤水分动态产生影响的本质原因,并对充填煤矸石和粉煤灰复垦的土壤水分动力学参数进行修正.结果表明:充填煤矸石和粉煤灰复垦的土壤水分动态与正常土壤不同源于煤矸石和粉煤灰的颗粒级配与土壤的差异;覆土层土壤与充填料孔隙的差别大,其保持水分的能力反而较强,煤矸石充填不会导致覆土层水分大量渗漏.

Water movement characteristics in cover soil in two types of filling gangue and fly ash were studied using upright column entity model, and then soil water movement was divided into 3 phases and 4 layers. The differences of water dynamics were found out by contrasting with that of all filled with soil. The natural cause of impacts on cover soil dynamics by fillings was found out by contrasting monitoring data with that gotten by simulation using one dimensional mathematic model of soil water, and then soil water dynamic models of fillings were amended in two conditions. The result indicates that： the differences of water dynamics in cover soil in fillings are caused by the relations of particles makeup between the cover soil and the fillings, just like gangue and fly ash; the bigger difference of the porosity between cover soil and fillings, the greater capability of the cover soil keeps the water. So it can not be large water leakage in land filled with gangue.