It is of great significance for calculating the recovery rate of the rare earth resources in-situ leaching to master the distribution law of pore water pressure around the diversion conduit.Assuming that the channel of water flowing into the diversion conduit horizontally is the ubiquitous 2-branched fractal tree-like network structure,based on Hagen-Poiseuille equation,the horizontal pore water pressure distribution expression of the diversion conduit was put forward.The indoor model test results showed that they were effective to describe the seepage channel of the water flowing into the diversion conduit by using the 2-branched fractal tree-like network structure;with increasing of the initial water head,the length ratio of the pipe at each level of the tree-like branched network gradually increased and the increasing range was smaller and smaller,but the diameter ratio and the length of the primary pipe gradually decreased,then became stable,diameter ratio of the pipe at all levels was stable at 0.84.%掌握导流孔周孔隙水压力分布规律对计算原地浸矿母液回收率具有重要意义.假设水沿水平方向流入导流孔的通道为普遍存在的2分叉分形树状网络结构,基于Hagen-Poiseuille方程,提出导流孔周水平方向孔隙水压力分布计算公式.室内模型试验结果表明,采用2分叉分形树状网络结构描述水流入导流孔的渗流通道是有效的;随初始水头增加,描述树状分叉网络的各级圆管长度比逐渐增加,且增加幅度越来越小,但是各级圆管的直径比和初级母管长度逐渐减小,并渐趋稳定,各级圆管的直径比稳定值为0.84.
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