中文摘要：

原地浸出采铀是一复杂的非线性动力系统,涉及诸多因素与过程的耦合和正负反馈作用。为研究地浸采铀过程中岩石结构力学及其演化规律、岩石变形作用、孔隙度与渗透率的动力演化等对浸出效果的影响,建立了一多因素、多过程耦合的综合动力学模型和模拟方法,并基于Fortran与C＋＋语言编制了1～3维模拟程序。通过对某地浸铀矿床某采区酸化、生产、溶浸末期各阶段的数值模拟,得到各生产时期矿岩中铀的浓度分布,该采区酸化40d后浸出液中铀浓度增加到15mg/L,以及该采区铀5a后基本浸出完毕;在生产末期,浸出液中的铀、酸浓度下降明显,采场区域铀浓度降低到10mg/L,pH升至2左右。数值模拟结果与矿山实际生产情况基本吻合。该模型和程序可应用于地浸采铀的理论研究、矿山设计、生产管理和地下水污染物迁移与复原研究。

英文摘要：

In-situ leaching of uranium is a very complicated non-linear dynamic system,involving the couplings among various factors and processes and the positive and negative feedback actions.In order to study the influences of rock structural mechanics and its evolution law,rock deformation,the dynamic evolution of porosity and permeability on leaching effect,a coupling model and simulation method were founded among multivariate and multi-process leaching kinetics,and a 3-D simulation program was compiled based on Fortran and C＋＋.Through the numerical simulation of the leaching process in acidification,production and terminal stages,the distribution of uranium concentration in various production stages was obtained,uranium concentration in groundwater of the leaching area increases to 15 mg/L after 40 d acidification;the uranium in this area is completely leached after 5 years production;and the concentrations of uranium and acid obviously decrease in the end stage,with the concentration of uranium decreasing to 10 mg/L and the pH approaching around 2.0.The numerical analysis results coincide with practical production.And the model and program can be applied in theoretical study,engineering design,production management,and the study of groundwater contaminant transport and restoration for in-situ leaching of uranium.