摘要
为了研究柱浸过程中矿岩散体结构及颗粒间溶液分布规律,采用核磁共振技术(MRI)对柱浸实验过程进行了探索成像实验,优选了序列编码方式,得到了饱和状态下柱浸的横纵断面图像.结果表明:应用T1 FLAIR序列能够获得边界清晰的图像;溶液的分布情况均呈现出不均匀性,与散体介质的不均匀性相一致;图像含水区域纵向连通区域是溶液运移的主要通道,且边壁效应对溶液横向分布有很大影响.溶液分布的不均匀性可由平均含水率、标准偏差和变异系数3个值综合评价,通过对横纵截面图像后处理,得到了截面含水率分布,计算出横纵截面含水率分别为22.76%,40.58%.
In order to study the structure of granular media of mine rock and the distribution of solution among particles, Magnetic Resonance Imaging （MRI） technology was used to examine the micro-images during the experiment of column leaching. A sequence coding method was optimized and the images of plane and profile sections at a saturation state were obtained. Results show that boundary-clear images can be obtained using T1 FLAIR sequence method; the distri- bution of the solution is heterogeneous, which is similar to the granular medium; the longitudi- nal connected region is the main channel for solution migration, and the wall effect hasa significant impact on the transverse distribution of the solution. The heterogeneity of solution distribution can be evaluated by average moisture content, standard deviation and variable coefficient. The distribution of moisture content on each section is calculated by analyzing the postprocessing images, and the moisture content of plane and profile sections are 22.76% and 40. 58 %, respectively.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2014年第4期582-587,共6页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51104011
51374035)
新世纪优秀人才支持计划项目(NCET-13-0669)
全国优秀博士学位论文作者专项资金项目(201351)
关键词
核磁共振成像
柱浸
散体介质
含水率
magnetic resonance imaging
column leaching
granular media
moisture content
