离子型稀土矿边坡稳定性与注液高度优化研究

某离子型稀土矿采用原地浸入法开采，为了研究其边坡稳定性，针对矿山3个采区的地质地形情况，建立了9个最具代表性的边坡稳定性分析剖面。采用Slide6.0软件分三种工况条件分别计算了注液前后边坡安全系数及破坏概率，结果表明：注液前各剖面在三种工况条件下均满足安全系数要求，边坡稳定性状况良好；注液后各剖面安全系数均较大幅度降低，自重+地下水+地震力为最不利工况；3-2剖面边坡在最不利工况条件下安全系数小于允许值1.05，破坏概率达到45.6%，剖面边坡存在较高的失稳破坏风险。通过进一步优化注液顺序与注液高度，减少饱和注液的时间，得出了3-2剖面边坡注液需分为两个阶段，第一阶段注液高度不能高于35 m，第二阶段可一次性注液到底，按此步骤及要求进行注液开采可保障该剖面边坡稳定性。

Research on Slope Stability and Liquid Injection Height Optimization of ion-type Rare Earth Mine

An ion-type rare earth mine was mined by in-situ immersion method. In order to study the slope stability, 9 most representative slope stability analysis sections were established according to the geological topography of the three mining areas of the mine. The slide 6.0 software was used to calculate the safety factor and failure probability of the slope before and after the liquid injection in three working conditions. The results showed that before liquid injection, each profile met the safety factor requirements under the three working conditions, and the slope stability was good; After liquid injection, the safety factor of each profile was greatly reduced, and the deadweight + groundwater + seismic force was the most unfavorable working condition; The 3-2 section slope under the most unfavorable conditions was less than the allowable value 1.05, the failure probability reached 45.6%, and the section slope had a higher risk of instability and failure. By further optimizing the injection sequence and injection height, and reducing the saturated injection time, it was concluded that the injection of the 3-2 section slope must be divided into two stages. The height of the liquid injection in the first stage cannot be higher than 35m, and the liquid can be injected to the end at one time in the second stage, According to this step and requirements, liquid injection mining can ensure the slope stability of the profile.