Study On Erosion Resistance Of Soil In Different Reclamation Models Of Dumping Site In Haizhou Open-pit Coal Mine

The study of soil erosion resistance is a hot and difficult point in the study of hydraulic erosion mechanism.It is also an important parameter for evaluating soil erosion resistance and a theoretical support for regional vegetation restoration and soil and water conservation.In the reclamation area of Haizhou opencast coal mine dump,the soil type is reclaimed soil.As the reconstructed soil,the soil sequence is disordered,the soil structure is poor,and the nutrient is poor.The structure is loose and greatly affected by hydraulic erosion.Therefore,it is clear that the soil erosion resistance of Haizhou Open-pit Coal Mine is of great significance to the ecological restoration of industrial and mining areas.In this paper,the undisturbed soil erosion test and the physical analysis of indoor soil samples were used to analyze the open air of Haizhou.The erodibility and erosion resistance of soils in different reclamation modes in coal mine dump were studied.The results are:(1)With the increase of water immersion time,the change of soil erosion resistance index of different reclamation modes was different.The index of soil erosion resistance of different reclamation modes decreased sharply in 2min-4min,and the different reclamation modes tended to be stable after 6min,and the changes of soil erosion resistance index of different reclamation modes were different with the increase of water immersion time.(2)The corrosion resistance index(S)of different reclamation modes decreased with the increase of immersion time(T),indicating that with the increase of immersion time,soil particles were more easily dispersed and collapsed,and soil corrosion resistance became weaker and weaker.(3)Through principal component analysis,four principal components were extracted,and the cumulative variance contribution rate of the four components reached 98.42 per cent.The soil corrosion resistance could be described in a more comprehensive way.The content of water-stable aggregates > 0.25 mm and the damage rate of the structure could be described in a more comprehensive way.< 0.05 mm particle content and organic matter were regarded as the best indexes for evaluating soil corrosion resistance.(4)The total soil runoff sediment concentration of different reclamation patterns was as follows: cultivated land > wasteland > Robinia pseudoacacia forest land > mixed forest land > elm forest land > shrub forest land.Under different reclamation modes,the diameter distribution of plant root system is different,and the plant root system can enhance the soil anti-scour ability.The corrosion resistance of wasteland is close to that of bare sandy land.The soil anti-scour ability of different reclamation modes in Haizhou opencast coal mineshows that the scrub forest land has the best scour resistance,the cultivated land soil has poor scour resistance,and the root system of the shrub forest land has more ability to strengthen the soil scour resistance than other land use types.This study comprehensively reflects the erosion resistance of soil from the aspects of corrosion resistance change process,erosion resistance change process,soil physical properties,plant root system and so on.It is of great significance to evaluate the productivity of reclaimed soil and the ecological reconstruction level of industrial and mining areas.