某离子型稀土矿边坡稳定性分析-有色金属科学与工程.docVIP

某离子型稀土矿边坡稳定性分析 陈荣军a 廖伟成a 张耀平b 张贤平b (江西理工大学,a.资源与环境工程学院；b.应用科学学院，江西 赣州 341000） 摘 要：依据某离子型稀土矿原地浸矿施工实例，使用有限差分软件FLAC3D对其边坡稳定性进行了数值模拟渗流分析，得到了该稀土矿边坡在持续大量注入溶浸液后的孔压场、位移场、安全系数等数据。分析结果表明：注液5~20 d内孔压场以大于15 kPa的速度增加，第20 d时孔压增大到93.82 kPa，位移也迅速增大到-24.44 mm，安全系数由施工前的1.74迅速减小到1.31。开挖集液暗沟后，注液第20~30 d的孔压稳定在85.33~85.61 kPa，累积最大位移为-25.26~-26.16 mm，安全系数稳定在1.27，总体来看，边坡能维持长期稳定。 关键词：原地浸出；onic rare earth mine CHEN Rongjuna LIAO Weichenga ZHANG Yaopingb ZHANG Xianpingb School of Resource and Environmental Engineering;b.College of Applied Science, Jiangxi University of Science and Technology,Ganzhou 34100,China) Abstarct：The Flac3D software, frequently-used finite difference software was used for slope stability transfusion numerical modeling. This modeling operation was based on a practice In-situ leaching mining in a ionic rare-earth mine. Lots of parameters were get to know after injecting amount of leaching solution, such as hole temperature-pressure、displacement field、safety factor and so on. Hole temperature-pressure was increasing with 15Kpa after injected leaching solution 5-20 days, and it was reach the top in the final day, the displacement was expanded to -24.44mm in a fast speed. The safety factor quickly reduced to 1.31 from 1.74 before construction. After the excavation of intercepting drainage, Hole temperature-pressure stay at 85.33~85.61 Kpa if leaching solution injection lasting for another 10 days. Accumulated maximum displacement for 25.26 ~ 26.16 mm at the same time. The safety coefficient of slope would turn to 1.27. In general, the slope can maintain long-term stability. Key words:in-situ leaching mine;ionic rare earth mine;slope stability;numerical simulation 0 引 言 离子型稀土富含世界上短缺的中、重稀土元素，具有很高的经济与战略价值，被我国政 府列为保护型开采的矿种之一[1-2]。含稀土离子的母岩经风化、溶解，产生稀土阳离子，阳离子经粘土矿物吸附富集而形成离子吸附型稀土矿[3-6]。离子型稀土矿一般赋存于花岗岩等火成岩的风化壳中,矿体呈层状分布于被风化、剥蚀、冲刷而形成的准丘陵地带中[7-10]。该矿种埋藏较浅，所在山体由浅往深部一般是表土层、全风化层、半风化层、微风化层和基岩,稀土离子主要存在全风化层和半风化层中[11]。针对离子型稀土矿，目前主要采用地表原地浅井浸出[12]。浸矿施工时，由于向山体风化矿层注入大量浸出药剂，使风化矿层含液量增加，同时浸出药剂与稀土矿的