# Analysis of Slope Stability in Ion-Adsorption Rare Earth Mine Under In Situ Leaching Condition
## 4 Conclusions  
This study analyzed the stability of the rare earth mine slope using Geo-Studio software. A seepage field under natural conditions during dynamic leaching was simulated, and the effects of continuous leaching on the stress and displacement fields, as well as on slope stability during the seepage processes, were assessed. The main conclusions are as follows:  
1. As the injection progresses, the pore water pressure in the injection hole area increases first, forming a high pore pressure zone and covering most of the weathered ore layers. Due to the deposition of leachate, the zero pore pressure line rises the fastest at the foot of the slope and enters a stable seepage period in the later stage.
2. The calculation method has little influence on the safety factor of the slope; the three methods have similar accuracy in calculating the safety factor of the studied slope. The safety factor of the rare earth slope decreases initially and then increases with the duration of leaching. The safety factor remains above 1.1 throughout the leaching process, indicating the slope is stable during the leaching and push-water operation stages.
3. The main mode of slope failure is circular sliding, and the depth of failure is relatively shallow. Due to the weak permeability of the topsoil layer, it is easy to cause the retention of the leaching solution. At the same time, the leaching solution has good fluidity in the fully weathered layer, and the weakened ore body is connected in this rock and soil layer to form a weak interlayer. Therefore, it is mainly concentrated in the shallow topsoil layer and the fully weathered granite range. Steep slopes are more prone to slope slip, and if the slope is relatively uniform, the potential slip surface is a large circular arc surface extending from the top to the foot of the slope.
4. Due to the injection starting from the upper part of the slope, the top of the slope is first affected and undergoes deformation and displacement in the direction of infiltration, while the vertical slope gradually decreases inward. The slope is prone to damage at the foot of the slope due to the deposition of leachate, and the possibility of slope failure increases in the later stage of liquid injection.
5. In summary, the slope of the studied Rare Earth Mine is relatively stable during the leaching and push-water operation. A well-optimal designed leaching solution injection plan can effectively prevent landslides. If the local instability of the slope is  
Figure 12: Distribution of displacement after 15 days of leaching.  
possible, the adoption of appropriate countermeasures can prevent the leaching of mining areas not affected. Finally, additional reinforcement methods can be employed if the aforementioned measures do not meet safety standards.  
Validation, D.S. and X.Z.; Formal analysis, C.L.; Investigation, F.Y.; Writing--original draft, W.Y. and H.W.; Writing--review and editing, D.S., F.Y. and L.D.; Visualization, W.Y.; Supervision, H.W. and L.D. All authors have read and agreed to the published version of the manuscript.  
This research was funded by Zhongxi Guangxi Rare Earth Co., Ltd.  
Not applicable.  
The original contributions presented in this study are included in the article. Further inquiries can be directed to the corresponding author.  
The authors declare no conflict of interest. The funder had no role in the design of the study; in the collection, analysis, or interpretation of data, in the writing of the manuscript, or in the decision to publish the results.