The influence law of mining intensity on RUSLE slope and length factor

Increased soil erosion is one of the main ecological and environmental problems faced by coal mining areas in the west. Coal mining has caused different degrees of surface subsidence and deformation, changed the slope and length factor, and destroyed the original surface process, therebychanging the soil erosion in the mining area. Therefore, mastering the law of the influence of mining intensity on soil erosion has important guiding significance for scientifically designing mining intensity to prevent and control soil erosion. Slope and slope length factoris a key variable in the classic soil loss equation, which has an important influence on soil erosion. Aiming at the correlation between mining intensity of working face and Revised Universal Soil Loss Equation (RUSLE) slope and length factor, combined with on-site surface subsidence movement monitoring data, mining subsidence probability integration method and revised soil loss equation, the calculation method of slope and length factor is deduced, and the relationship between the intensity of well mining and the change of slope and length factor in the modified soil loss equation is studied, which provides a theoretical basis for the balance of mining intensity and soil erosion control in the mining area. The research results show that: ① the slope and length factors predicted based on the probability integral method stripped off the influence of the natural undulating terrain before mining, and the results can more intuitively show the correlation between the mining intensity and the slope and slope length factors and theconclusions are more universal; ②the slope and length factor is positively correlated with working face height (r=0.757 1,p=0.048 7), and has a significant negative correlation with depth-to-thickness ratio (r=-0.952 2,p=0.000 9), and the correlation between the two is relatively high; ③after reaching full mining, the change of daily mining volume and mining width does not have a significant impact on the change of slope and length factor