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原地浸矿回收稀土资源时,因注液不当等原因,容易引发滑坡等地质灾害。选择陡坡开采矿块,现场实验研究裸脚式稀土矿山的原地浸矿渗流过程及其引起的边坡变形规律,得到如下结论。实验矿块的浸润面接近临界水位时,仍有26.5%的矿层处于非饱和状态,因而影响了离子交换效率和资源回收率,是造成“复灌”回收龙南类型离子型稀土资源的一个主要原因。实验矿块矿层饱和体积比为65.0%时,原地浸矿的渗流场进入平衡期,在平衡期之前,注液强度增加6天后裂缝宽度才有明显变化;进入平衡期之后,裂缝宽度变化滞后注液强度增加3天,滞后注液强度减小2天。对于坡度均一的陡坡,如果原地浸矿前期注液强度过大,易引发推移式滑坡,剪出口出现在半山腰以上,后期注液强度过大,易引发牵引式滑坡,剪出口出现在山脚下;对于上陡下缓的陡坡,原地浸矿易引发推移式滑坡。
In situ leaching recovery of rare earth resources, due to improper injection and other reasons, easily lead to landslides and other geological disasters. Select the mining of steep slopes, on-site experimental study of bare-footed rare earth mine in situ leaching and seepage process of slope deformation caused by the law, the following conclusions. When the infiltration surface of the experimental nugget is close to the critical water level, 26.5% of the ore is still in the non-saturated state, thus affecting the ion exchange efficiency and the resource recovery rate, which is one of the reasons for recovering the ionic resources of Longnan type main reason. When the saturated volume ratio of the ore body is 65.0%, the seepage field of in-situ leaching ore enters into the equilibrium period. Before the balance period, the crack width changes only after 6 days of injection strength increase. After entering the equilibrium period, the variation of the crack width lags behind Infusion strength increased 3 days, lagging injection strength decreased 2 days. For steep slopes of uniform slope, if the in situ leaching strength is too large in the early leaching stage, it will easily lead to the progressive landslide. The shear outlet appears above the mid-mountainside and the late injection strength is too large, which will lead to the traction landslide. The shear outlet appears in the mountain At the foot of the steep slope, steep slopes gently steeply lower than the steep slopes.