Study on slope deformation mechanisms and stability of ion-adsorption rare-earth mine induced by in-situ leaching
In this paper,based on the fluid-solid coupling theory and combined with the field monitoring data,the evolution law of seepage field,deformation field and slope stability of a rare earth mine in southern Jiangxi Province during the in-situ leaching process are studied to disclose the mechanisms of slope deformation and unstable failure.The results show that the influence range of the seepage field in the initial phase of liquid injection is mainly distributed in the injection zone at the top of the mine,resulting in the formation of a large plastic zone on the top of the mountain.With the continuous improvement of liquid injection strength,the saturated surface of the leaching liquid rises rapidly and the plastic zone extends downward along the bedrock from the top of the mine to both sides of the slope,which induces the accelerated outward deformation of the mine slope and a significant decrease in the safety factor of the slope.When the injection and collection strengths are roughly in equilibrium,a stable seepage field is formed inside the mine,and the slope deformation tends to be stable.In general,the strength of in-situ leaching and the height of the saturated surface are the main factors affecting slope deformation and stability.The relevant research results provide a theoretical basis and engineering reference for the treatment of landslide induced by in-situ leaching.
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