水资源与水工程学报2025，Vol.36Issue(5)：169-177,9.DOI:10.11705/j.issn.1672-643X.2025.05.20
基于核磁共振的尾矿砂细观渗流试验研究
Experimental study on mesoscopic seepage of tailings sand based on nuclear magnetic resonance
摘要
Abstract
Based on the nuclear magnetic resonance technology,indoor seepage tests on tailings sand with different fine particle contents and relative densities were carried out to study the coupling mecha-nism of fine particle content and density on the seepage failure from a mesoscopic perspective.Subse-quently,a method for calculating the contribution of different pores to permeability based on T2 spectra was proposed.The results show that the T2 spectra of tailings sand under seepage action present a three-peak structure.The connectivity of micro-pores and medium-pores is greater than that of large pores.The porosity of large pores keeps increasing,while that of micro-pores and medium-pores changes unstably.The increase of fine particle content and density has an adverse effect on the pore development.When seepage failure occurs,the micro-pores and medium-pores decrease significantly,while the large pores increase sharply.With the increase of fine particle content,the growth rate of permeability decreases,and there is a threshold of fine particle content,which decreases with the increase of density.Micro-pores and medium-pores contribute little to permeability,while large pores contribute more than 98%.Increas-ing the hydraulic gradient enables pores with larger diameters to participate in the seepage process.The research results can provide a theoretical reference for the safe operation of fine particle tailings dams.关键词
尾矿砂/核磁共振/渗流试验/孔隙结构/孔隙度/渗透率贡献度Key words
tailings sand/nuclear magnetic resonance/seepage test/pore structure/porosity/contribu-tion to permeability分类
水利科学引用本文复制引用
许增光,郑力,曹成,柴军瑞,武子豪..基于核磁共振的尾矿砂细观渗流试验研究[J].水资源与水工程学报,2025,36(5):169-177,9.基金项目
国家自然科学基金项目(52179143) （52179143）
陕西省科技创新团队项目(2022TD-01) （2022TD-01）
