Reshaping slope form of grassland coal mine dump based on natural slope model

The traditional slope model of the waste dump cannot be well integrated into the surrounding environment in mining area,which leads to serious soil and water loss in the dump. Therefore,it is necessary to reshape the landform of slope to reduce the soil loss,improve the soil conservation ability of the slope,and make the dump be able to coordi- nate with the surrounding environment. Near-natural topographic reconstruction takes undisturbed landform as refer- ence to construct a landform model in line with local erosion process,which has many applications in topographic rconstruction at domestic and overseas. Based on the theory of near-natural topographic reconstruction and the principle of statistics,this paper takes Shengli mining area as the research area,extracts and analyzes the characteristic parame- ters of the natural slope in this area,and constructs the anti-S type slope model. WEPP model is used to compare and analyze the soil retention ability and long-term stability of the anti-S slope model and the original dump slope model, and the advantages of the anti-S slope model are verified. The specific results are as follows:① the characteristic pa- rameters of the natural slope of Shengli mining area are extracted for analysis,and the results show that the main side slope type of Shengli mining area is anti-S slope. On this basis,two new slope characteristic parameters,convex hori- zontal ratio and convex vertical ratio are proposed,and the characteristic parameters of anti-S slope are extracted. ② Correlation analysis and curve fitting of slope characteristic parameters of steep slope and gentle slope in Shengli min- ing area are conducted respectively. On this basis,the anti-S type slope model of steep slope and gentle slope is con- structed respectively,and it is found that the dividing point of concave and convex in the vertical direction in anti-S slope model of steep slope is located near the golden section ratio. ③ The anti-S type slope model of the steep slope is used to design the characteristic parameters of the slope of the dump in Shengli mining area. After input data of Sheng- li mining area in WEPP model,such as climate,soil,vegetation data,the water erosion analysis is carried out on the constructed slope model and the original dump slope model of the dump under the condition of different slope height and different simulation years,the results show that with the increase of slope height and simulated years,the anti-S type slope model has a better soil retention capacity and long-term stability than the original dump slope model,which can be used as the basis for the design of dump slope.e