Previous studies on the relationship between rare earth in in-situ leaching and stability of rare earth slope have shown that the effect of ore bed thickness is often ignored.For this purpose three representative structural models are selected

and based on the theory of saturated-unsaturated seepage proposed by Fredlund

the relationship between saturated liquid level/pore water pressure of slope and leaching time is constructed under different injection intensities considering the thickness of rare earth ore bed.Then these models are applied to study the effect of thickness of complete weathering ore bed on the seepage characteristics and stability of slope.Results show that under a given ore bed thickness

the higher the strength of the liquid injection

the faster the saturation line and the pore water pressure increase

and the faster the slope stability decreases.The ore bed thickness has a significant lag effect on the rise of saturation line under a certain injection intensity;it shows that for a thicker ore bed

the saturation line and pore water pressure will increase more slowly

corresponding to a gentler decrease rate of slope stability.Therefore

the influence of thickness of rare earth ore bed on the seepage field and stability of rare earth slope is remarkable

and it is necessary to consider the ore bed thickness when choosing a reasonable injection intensity in the process of rare earth in-situ leaching.