Abstract:The slope stability of ionic rare earth ore is a key issue restricting the safe mining of mines. Based on the self-made simulation test device, the simulation tests of ionic rare earth landslides under different rainfall-leaching conditions were carried out, the characteristics of the slope wetting front and the failure characteristics of the slope topography were depicted, the variation law of soil moisture content and pore water pressure was revealed, and the slope stability was numerically simulated by COMSOL. Through the model test, it is found that the failure mode of the slope is mainly the comprehensive failure caused by shallow collapse and erosion slip, the soil moisture content at the slope surface and the foot of the slope increases first and then tends to stabilize during the rainfall infiltration, the pore water pressure at the slope rises first and then tends to be stable. The saturated water content is between 41% and 44%. The pore water pressure inside the slope increases from stable to sudden increase and then tends to be stable. Through the numerical simulation analysis, it is found that with the increase of rainfall intensity, the change of rainfall has a slightly greater impact on the safety factor of slope, which decreases by 4.26%. The effect on cohesion and internal friction Angle is small, decreasing by about 2.7%.

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