| Huainan is an important thermal power base in East China,the amount of fly ash and the amount of fly ash increases year by year with the development of electric power industry.As a kind of filling soil,fly ash has the advantages of solving the problem of coal mining subsidence area and reducing the occupation of cultivated land area.But in the filling soil matrix,how collocation has not yet formed a unified standard,no fly ash reclaimed soil fertility factors spatial characteristics for different thickness of covering soil are analyzed,the relevant mathematical model based on the in-depth study is needed for soil quality after reclamation,so as to provide the basis for the selection of scientific reclamation measures.The research on Huainan City Pingwei Power Plant fly ash yard as the research area,through long-term field monitoring,field sampling investigation and laboratory tests,starting from the angle of reclaimed soil fertility,selected soil bulk density,soil particle composition,water content,organic matter and other indicators,with the help of geological statistics and classical statistics method on different soil the thickness of fly ash reclaimed soil fertility elements and spatial distribution characteristics,soil fertility index,soil moisture characteristics of comprehensive analysis and prediction based on WHCNS model for different thickness of covering soil fly ash filling reclamation soil moisture.Based on the above research results,the best reclamation thickness of the Huainan coal mining area was determined.The results show that:The spatial distribution pattern of four soil fertility indexes was divided into two types,soil organic matter content,soil bulk density and grain content were classified as a class,and their values were positively correlated with casing thickness.Soil moisture content has shown the opposite pattern,the thicker the thickness of casing,the smaller the value.The key fertility index of fly ash filling reclaimed soil reflects the above-mentioned spatial distribution pattern,which is the result of the combined effect of casing thickness,casing dressing and tillage,in which casing thickness plays a major role.When the casing thickness reaches 40-50cm,the soil fertility has reached the highest level of reclamation area.Considering the soil physical and chemical properties of each fly ash land reclamation model,it is considered that the thickness of the soil is 40-50cm.In addition,the prediction results show that based on the WHCNS model of water and soil thickness has great influence to land reclamation soil moisture,soil thickness increasing,moisture effect of fly ash on the bottom of the upper soil is smaller,with the change of time the volume of soil moisture level of the same trend,but the increase of the soil thickness the soil moisture content has a certain effect,from this point of view,the greater the thickness of covering soil. |
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