酸法地浸采铀多井系统中渗透系数时空演化模拟

为了解酸法地浸采铀过程中含矿含水层渗透系数时空演化规律，通过数值模拟的方法建立了由两组五点型地浸抽注井构成的二维反应动力学模型，模拟酸法地浸采铀中孔隙度-渗透系数时空演化过程，探讨含矿含水层渗透系数时空演化规律。模拟结束时模拟区域内渗透系数区间为5.37 m/d, 14.7 m/d]。通过渗透系数时间演化结果可知，在渗流作用和化学反应前锋不断向抽液孔推进，渗透系数发生变化的区域随时间不断增大，模拟区域内渗透系数区间值随时间不断增大，模拟结束时6个注液孔周围的渗透系数演化情况差异较小；矿层内渗透系数大于初始值的范围为注液孔中心相距约3 m（占抽注半径1/10）处的圆柱体内，渗透系数最小值出现在与注液孔中心相距约5.66 m处的圆周上，含矿层内大部分区域的渗透系数均小于初始值，根据模拟结果渗透系数最小值可能出现在与注液孔距离抽注半径的1/6~1/5区域内。 

Simulation study on the spatiotemporal evolution of the permeability coefficient in a multiwell system of uranium leaching by the acid method

To understand the spatial-temporal evolution law of the permeability coefficient of ore aquifers in the process of uranium leaching by the acid method, a two-dimensional reaction dynamics model consisting of two sets of five-point dip extraction wells was established through numerical simulation. The temporal-spatial evolution process of the porosity-permeability coefficient in urannium leaching by the acid method was simulated to discuss the temporal and spatial evolution law of the permeability coefficient of ore-bearing aquifers. At the end of the simulation, the interval of the permeability coefficient in the simulation area is 5.37 m/d, 14.7 m/d]. It can be seen from the results of the time evolution of the permeability coefficient that, with the front of the seepage effect and chemical reaction continuously advancing toward the extracting hole, the area where the permeability coefficient changes and the interval value of the permeability coefficient in the simulation area increase over time. The evolution of the permeability coefficient around the six injection holes varies slightly at the end of the simulation. The area where the permeability coefficient of the ore layer is greater than the initial value is in the cylinder approximately 3 m to the center of the injection hole (accounting for 1/10 radius of the injection radius). The minimum permeability coefficient value appears on the circumference approximately 5.66 m away from the center of the injection hole. The permeability coefficient of most areas of the aquifer is less than the initial value. According to the simulation results, the minimum value of the permeability coefficient may occur in the region between 1/6 and 1/5 of the pumping and injecting radius away from the injection hole.