Vertical Soil Erosion Of Mine Waste Rock Field Simulated Rainfall Study

Yunnan province is famous as mineral industry. But the explotation of mineral industry results in not only destructive land recultivate, but also environmental pollution problems and so on. Especially water and soil erosion caused by mining areas and destroyed ecological environment are more serious. Dahongshan iron ore, the biggest building mine of Yunnan province, locating in Xinping county Yunnan province. This study chose the Dahongshan mine which has very important significance to the developing of Yunnan iron and steel industry as our work.When the service of mullock field is expires, for the sake of the improvement view, the instauration ecosystem, it is important to carry on the land to recultivate. There are many erosion forms in recultivate soil. Vertical erosion is important reason which affect diggings soil productivity resumed. It can result water and soil loss, fertility descend. Vertical erosion is a special waterpower rock erosion form, which consist in diggings abroad, especially in mullock field. This study is going to using the way of artificial simulation rainfall to research happen mechanism of vertical erosion thoroughly and quantificationally.Kust03-1 artificial simulation of rainfall device was successfully manufactured by our laboratory research team for two years developing, one year applying, and ten thousand data calibrated. The device includes sprayer, bracket, water supply and power supply. Rainfall intensity control range from 12.8mm/h to 84.0mm/h, rainfall uniformity are above 80%, partly achieve 98%. Rainfall height is 4.8m, raindrop descent terminal velocity is conform nature raindrop. Kust03-1 artificial simulation of rainfall device is proved that design is in reason, characteristic is accurate, parameter is credibility, which can fulfil demand of water and soil conservation monitoring. The rainfall utensil is a kind of economy and utility device.Through experimentation study and theory analyse, we introduction discuss Dahongshan soil, Bainishan soil and thin sand these samples'commonly mechanism and disciplinarian when happen vertical erosion. These mostly results indicates that:? For homogeneity soil, erosion quantity is increase with rainfall intensity increase. We find vertical erosion gross regress equation(4.1) T# = 2026e00226' > R2 =0.9263, (4.2)ra -819.5e00329i > R2 =0.9995, (4.3) T& =574.73e0029i, R2 =0.9641.(2) Wherever what kinds soil, erosion quantity show increase trend with mullock deepness increase.(3) Loss soil is cut only one small part in shallow layer mullock, mass soil is washed out by current to deep layer. 75cm thick mullock erosion quantity M occupy gross T, thin sand is 12.21%o, Dahongshan soil is 14.44%>, Bainishan soil is 7.52%o.? We find critical rainfall that arose vertical erosion happen, Bainishan soil is 30.74mm, Dahongshan soil is 44.05mm. When the rainfall overrun the critical value, vertical erosion will happen.(5) More sand content in soil, more fierceness vertical erosion degree. The three samples' erosion degree show a current: thin sand > Dahongshan soil > Bainishan soil.? Soil penetrability has osculation relationship with vertical erosion. More great soil penetrability, more fierceness vertical erosion degree.Vertical erosion gross of Dahongshan iron mullock recultivate soil is forecasted basing erosion gross regress equation(4.2). Result indicate this diggings erosion gross is 4441.96t, erosion modulus is 11729.5 t/km2