Warning Model of the Ionic Rare Earth Mine Slope Based on Creep Deformation Time Series

Dan Wang,Li Liu,Mei-Dao Zhang,Min Han,Yun-Zhang Rao,Liang Shi,Yanan Gao

doi:10.1155/2021/2236476

Abstract

This paper takes the actual working conditions of leaching mining, with the Xikeng Rare Earth Mine in Anyuan County as the research object. The slope surface monitoring as a technical means is used to analyze the deformation characteristics, including cumulative displacement, velocity, and acceleration, and the leaching slope and establish an early warning system to assist with leaching production. The study shows that there are three stages in the process of ionic rare earth mine slope deformation, i.e., the initial stage with deformation velocity in 0.15 to 0.30 mm∙h-1, the speed of the uniform deformation stage fluctuating but maintaining at -0.15 to 0.15 mm∙h-1, and the accelerated deformation stage when the velocity and acceleration are 3 to 10 times or more than those of the initial deformation stage. The practice had proved that the monitoring system responded positively when an alarm based on the Local Outlier Factor (LOF) was issued so that the production process was in a safe state and no large-scale landslide disaster occurred. This study will provide theoretical and technical support for the safe and efficient mining of rare earth in situ leaching.

Highlights

In southern Jiangxi, ionic rare earth ore mining has gone through three steps of pool leaching, heap leaching, and in situ leaching [1,2,3]
The deformation speed of the rare earth mine slope shows a response slightly lagging behind the acceleration, and the acceleration shows a more stable trend
(3) The Local Outlier Factor (LOF) value based on the deformation of multiple measuring points has high self-adjustment ability and good robustness

Summary

Introduction

In southern Jiangxi, ionic rare earth ore mining has gone through three steps of pool leaching, heap leaching, and in situ leaching [1,2,3]. To solve the landslide in the in situ leaching process, Rao et al [6] conducted on-site inspections of the rare earth mines with different deposit conditions and analyzed the main types of landslides and the catastrophic factors that caused them. They formulated relevant prevention and control measures in the field. The higher the concentration of the leaching agent within a certain range, the more pronounced this phenomenon becomes This characteristic will cause the slope soil saturation to increase continually, and the mechanical strength gradually decreases

Methods

Results

Conclusion