摘要
在原地浸矿和稀土边坡稳定性关系研究中,往往忽略了矿层厚度的影响,为此选取3个具有代表性的边坡实例,基于Fredlund提出的饱和-非饱和渗流理论,构建考虑稀土矿层厚度的采场边坡在不同注液强度下浸矿饱和液面及孔隙水压力与浸矿时间的关系,研究不同全风化稀土矿层厚度对边坡渗流场及稳定性的影响。结果显示,在矿层厚度不变的情况下,注液强度越高,坡体内浸润线和孔隙水压力增加越快,边坡稳定性下降越快;在一定的注液强度条件下,矿层厚度对浸润线的上升具有明显的滞后效应,厚度越大,浸润线和孔隙水压力上升速度也越慢,边坡稳定性下降速度则相应减缓。因此,稀土矿层厚度对稀土边坡渗流场及稳定性的影响是显著的,稀土采场拟定合理注液强度时不容忽视。
Previous studies on the relationship between rare earth in in-situ leaching and stability of rare earth slope have shown that the effect of ore bed thickness is often ignored.For this purpose three representative structural models are selected,and based on the theory of saturated-unsaturated seepage proposed by Fredlund,the relationship between saturated liquid level/pore water pressure of slope and leaching time is constructed under different injection intensities considering the thickness of rare earth ore bed.Then these models are applied to study the effect of thickness of complete weathering ore bed on the seepage characteristics and stability of slope.Results show that under a given ore bed thickness,the higher the strength of the liquid injection,the faster the saturation line and the pore water pressure increase,and the faster the slope stability decreases.The ore bed thickness has a significant lag effect on the rise of saturation line under a certain injection intensity;it shows that for a thicker ore bed,the saturation line and pore water pressure will increase more slowly,corresponding to a gentler decrease rate of slope stability.Therefore,the influence of thickness of rare earth ore bed on the seepage field and stability of rare earth slope is remarkable,and it is necessary to consider the ore bed thickness when choosing a reasonable injection intensity in the process of rare earth in-situ leaching.
作者
何书
陈飞
刘强
刘友存
HE Shu;CHEN Fei;LIU Qiang;LIU Youcun(Jiangxi University of Science and Technology,School Resources Environmental Engineering,Ganzhou 341000,China;Jiangxi Key Laboratory of High Efficient Utilization of Rare Earth Resources,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2018年第3期528-534,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金面上项目(41471001)
江西省自然科学基金项目(20171BAB203029)
江西理工大学大学生创新创业训练项目(XZG-16-08-03)资助
关键词
原地浸矿
边坡
稳定性
渗流特征
矿层厚度
in-situ leaching
slope
stability
seepage characteristics
thickness of ore bed
