岩土工程学报2024，Vol.46Issue(4)：880-889,10.DOI:10.11779/CJGE20221546
基于低场核磁共振技术PVC-P土工膜细观渗透机理研究
Micropermeation mechanism of PVC-P geomembranes by low-field NMR technology
摘要
Abstract
The impermeability of PVC-P geomembranes is of significant importance to the safe operation of a project.To avoid the drawbacks of adopting the permeability coefficient to characterize permeability traditionally,a mathematical model for porosity and seepage discharge is proposed based on the results of the vertical permeability tests and the porosity obtained from the low-field NMR tests,and the applicability of porosity to evaluate the permeability is explored.The results show that the low-field NMR technology with 1H atoms as the probe can accurately measure the distribution of pores and pore radiis.The proportions of the micropores,mesopores and macropores and the shrinkage and development of the pore radii are primarily responsible for the variation of the porosity.The porosity is closely correlated with the seepage discharge,and the proposed model can accurately predict the seepage discharge.Furthermore,the porosity can evaluate the impermeability of PVC-P geomembranes.关键词
PVC-P土工膜/渗透流量/孔隙度/低场核磁共振技术/T2特征谱Key words
PVC-P geomembrane/infiltration flow/porosity/low-field NMR/T2 characteristic spectrum分类
建筑与水利引用本文复制引用
张宪雷,尹春杰,马仲阳,谷晓雨..基于低场核磁共振技术PVC-P土工膜细观渗透机理研究[J].岩土工程学报,2024,46(4):880-889,10.基金项目
国家自然科学基金项目(52009045) （52009045）
