Study On Ecological Restoration Planning And Design Of Open-pit Iron Tailings DamSlope

Ecological restoration technology is a key technology for controlling soil erosion in mine abandoned areas and quickly repairing vegetation.In recent years,due to the rapid economic development in China,the exploitation of mines has also been strengthened,resulting in serious damage to the ecological environment.Therefore,the ecological restoration of mines after mining is imminent.This study takes the demonstration slope of open-pit iron ore tailings tailings in Chicheng County,Hebei Province as the research object.Through investigation of slope characteristics and analysis of soil physical and chemical properties,combined with mine slope ecological restoration theories and methods,exploration can be carried out in the process of slope repair.The engineering measures and vegetation measures that make the slope stable provide an exemplary role for the promotion of forestry ecological technology in Chicheng County,Hebei Province.The results of this study indicate:(1)The most influential factor in the ecological restoration of the tailing reservoir demonstration slope is soil bulk density,followed by soil organic matter,soil total nitrogen(TN),soil water content and soil hardness.The comprehensive quality of different slopes was sorted from high to low(significance difference level p<0.05):tailings reservoir forest soil>artificial tailing pond treatment slope soil>tailings reservoir demonstration slope soil,tailings reservoir demonstration edge The average soil bulk density of the slope is 1.62g/cm3,the average soil moisture content is 3.83%,and the contents of soil organic matter and total nitrogen are 0.71%and 0.33g/kg,respectively.According to relevant national standards,the tailings reservoir demonstration slope The content is below Grade 5,so it has a certain influence on the ecological restoration of the slope and the growth of the plant.For the ecological restoration of the model slope,the soil indicators with similar physical and chemical properties of the tailing land can be covered with alkaline soil with? 5%of soil organic matter and total nitrogen content of? 2g/kg.(2)Four aspects of the demonstration slope planning and design,including graded slope cutting planning and design,retaining wall planning and design,drainage planning and design and vegetation restoration technology planning and design,shall be applied to the scope of application,construction process and design standards of each design part.Summing up and matching its corresponding CAD engineering construction design drawings.(3)The selection of plant species during the process of vegetation restoration is very important.Through the comparative analysis of the average height of the shrubs and herbaceous vegetation on different sampling sites in the sample plots,this paper uses the adaptability,functionality and landscape as criteria for screening.Finally,it was determined that the best growing shrubs were Vitex negundo and Apricot;the herbs were eight plants of Paeonia lactiflora,Festuca arundinacea,Pleurotus eryngium,and Fasyantha chinensis as plants for demonstrating vegetation restoration on the slope in the Chicheng tailings reservoir for sowing,Spraying and container seedlings are planted in three ways to plant seeds.