离子型稀土矿山临界注液强度的计算

Calculation of critical liquid injection intensity for ion-absorbed rare earth mines

离子型稀土矿山在注液强度过大时容易引起滑坡,因此研究临界注液强度有重要意义.通过现场测试表土层、原矿层和尾矿层相关土性参数,基于Geo Studio软件计算了3种工况下注液面积百分比由30%增加到60%时临界注液强度和滑坡剪出口高度的变化规律.结果表明:随着注液面积百分比的增大,临界注液强度先快速减小,后趋于缓慢;滑坡剪出口高度随着注液面积百分比增大而逐渐减小;浸矿使得矿体的临界注液强度减小32%左右;而布置巷道收液工程使得其临界注液强度可达浸矿后的10~7.5倍左右;浸矿对滑坡剪出口高度基本不产生影响,但巷道收液工程可使滑坡剪出口高度增大1.40~1.23倍左右.

Ion-absorbed rare earth mines tend to cause landslides when the injection strength is too high,so it is of great importance to study the intensity of critical liquid injection.The relationship among the percentage of injection area and the critical injection intensity as well as the shear outlet height of landslide under three operation conditions was calculated by the GeoStudio software according to the related soil parameters of surface soil layer,raw ore layer and tailings layer tested on the spot.Experimental data indicates that the critical injection intensity decreases rapidly,and then tends to be slow gradually.The shear outlet height of landslides increases rapidly with the increasing of the percentage of liquid injection area.It increases lightly when the percentage of injection area is higher than 60%.The critical injection intensity of the ore body increases by 4.8 to 7 times when the tunnel liquid collection engineering is employed.Mineral-leaching has little effect on the shear outlet height of landslides.However,the height will increase about 18%when the percentage of liquid injection area is higher than 50%.