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中文摘要：
采用X光CT技术对微生物浸出前后堆浸散体的孔隙结构进行了扫描，在数字图像处理的基础上提出了以孔隙拓扑率评价孔隙连通性的优劣，分析了堆浸散体孔隙连通性的演化规律。研究结果表明：浸出后堆浸散体孔隙连通性比浸出前大大降低，同时从顶部至底部逐渐劣化。底部区域的横向孔隙连通性比浸出前同区域降低了64％，比顶部区域降低了51％，其纵向孔隙连通性比浸出前同区域降低了38％，比顶部区域降低了42％。微生物浸出前后堆浸散体的连通性均存在明显的各向异性，横向孔隙连通性高于纵向孔隙连通性。孔隙连通性的各向异性是导致散体介质渗流性能各向异性的重要因素之一。
英文摘要：
The granular ore media before and after bacterial heap leaching were scanned with X-ray computed tomo- graphy （CT） technology. It is proposed that the pore topological ratio obtained can be used to evaluate pore connectivity based on the digital image processing. The evolvement of pore connectivity of granular ore media during heap leaching was then investigated. Research results show that the pore connectivity of granular ore media decreased dramatically after leaching, being deteriorated gradually from top zone to bottom zone. After leaching process, the horizontal pore connec- tivity of bottom zone decreased by 64% and 51%, respectively, compared with the same zone and top zone, while the vertical pore connectivity of bottom zone decreased by 38% and 42%, respectively. The pore connectivity of the granular ore media tends to be anisotropic both before and after leaching, with horizontal pore connectivity higher than vertical one. The anisotropy of pore connectivity is one of crucial factors that contribute to the anisotropy in permeability of granular ore media.
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