A Study On Soil Erosion Process In Open-pit Coal Mine Dump Based On REE Trace Method

In this paper,a second-order dump model was established in Shengli No.2 opencast coal mine by means of simulation test,and a variety of rare earth elements were labeled on different platforms and slopes by using rare earth element tracer technique.In order to find out the law of soil erosion in dump,to improve soil erosion control and ecological restoration in dump for scientific theoretical basis.The main conclusions of this paper are as follows: the runoff yield and sediment yield of different rain intensity dump decrease with the increase of rain intensity,and the variation trend of runoff yield and sediment yield with time is gradually increased until relatively stable;the average runoff yield and average sediment yield show good linear relationship with rain intensity,R2 is above 0.845,the cumulative runoff and cumulative sediment yield show good function relation with time,R2 is above 0.9864;the cumulative sediment yield increases with the increase of cumulative runoff,which satisfies a good linear function relationship,and the R2 is 0.Over 993;cumulative The sediment yield and cumulative runoff increase greatly under the intensity mm/min 1.5 to 2.0 mm/min and less under the intensity mm/min 2.0 to 2.5.Calculation error of erosion sediment is less than 15% under different rain intensity in dump.Under 1.5 mm/min rain intensity,the contribution rate of sediment production to the first slope of dump is the largest,which is the main source of erosion sediment.2.0 mm/min The contribution rate of first-order slope is the largest,the first-order platform is the largest,and the first-order slope and the first-order slope are the largest under heavy rain platform as the main source of erosion sediment.2.5 mm/min the contribution rate of the first slope and the first platform is the main source of erosion sediment,and the second slope is an important source of erosion sediment.With the increase of rain intensity,the erosion effect of rainfall on dump becomes stronger,and the contribution rate of high-order platform and slope sand production increases gradually.In the first slope,the slope erosion is divided into four stages: the erosion stage,the embryonic stage,the development stage and the adjustment stage.With the increase of rain intensity,the flow velocity of slope surface and the flow velocity of inter-trench is increased.The slope velocity and the inter-slice velocity of the field rainfall are higher than the first rainfall.There is a positive correlation between the depth of the channel and the velocity of the channel,which increases with the increase of rain intensity.