Study on Three-dimensional Spatial Variability in Mechanical Parameters of Ion-type Rare Earth Ore Mine Soil

Ion-type rare earth ore is an important strategic resource in China. The main mining method currently employed is in-situ leaching. The spatial variability of mechanical parameters of rare earth ore has a significant impact on the stability of in situ leaching slopes. In order to study the spatial variability of mechanical parameters of an ion-type rare earth ore, this paper conducted shear tests on the slopes of a specific ionic rare earth ore deposit to measure the cohesion and friction angle at different locations on the slope, and analyzed the statistical characteristics of the cohesion and friction angle of the rare earth ore mountain. The spatial variability of cohesive force and friction angle is studied by pure bullion effect model, spherical model, exponential model, Gaussian model and linear abutment model respectively. The results show that the lognormal distribution is more suitable to describe the distribution law of cohesive force and friction angle of ion-type rare earth ore than the normal distribution, and there is a certain negative correlation between cohesive force and friction angle. The variable distance of cohesive force is about 18 m, while the friction angle is about 10 m. On this basis, a three-dimensional conditional random field of cohesive force and friction angle of ion-type rare earth ore is established based on Kriging method. The research in this paper provides theoretical support for stability analysis of in situ leaching slope.