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为了掌握堆浸铀矿堆非抱和区的水力学特性,根据多孔介质的液体流动控制方程和描述水力学性质的van Genuchten模型,阐述了堆浸铀矿堆水力学特征参数的数值反演模型。接着,选用来自某铀矿山新堆浸场分形维数D=1.8的铀矿石样,利用自制的一维液体非饱和渗流试验装置,测定了不同喷淋强度下试验柱底部的累计排水量和5个不同高度矿样内的含水率。最后,利用HYDRUS-1D软件获得了试验样本在注水期间和排水期间的水力学特征参数。结果表明:1数值反演方法确定的水力学特征参数能很好地与实际情况相匹配,参数估算结果可用于工程实际;2注水期间和排水期间需要分别确定对应的水力学特征参数;3注水期间反演估算获得的堆浸铀矿堆饱和渗透系数比排水期间的更接近饱和渗流试验获得的结果。
In order to understand the hydraulic characteristics of non-embracing zone of heap leaching uranium deposit, the numerical inversion model of heap hydraulics characteristic parameters of heap leaching uranium deposit is described according to the liquid flow control equation of porous media and van Genuchten model which describes the hydraulic properties . Then, the uranium ore samples with the fractal dimension D = 1.8 from a new heap pad of a uranium mine were selected. The self-made 1-D liquid unsaturated seepage test device was used to determine the cumulative displacement at the bottom of the test column under different spraying intensities and 5 Moisture content in different height samples. Finally, the hydraulics characteristic parameters of the test samples during water flooding and drainage were obtained by HYDRUS-1D software. The results show that: (1) The hydromechanical parameters determined by the numerical inversion method can be well matched with the actual situation, and the parameter estimation results can be used in engineering practice; (2) Corresponding hydraulic parameters should be determined during water flooding and during water flooding; (3) Water flooding During the period of inversion estimation, the saturation permeability coefficient of heap leaching uranium heap obtained is closer to that of saturated seepage test during drainage period.