Micropermeation mechanism of PVC-P geomembranes by low-field NMR technology

ZHANG Xianlei; YIN Chunjie; MA Zhongyang; GU Xiaoyu

doi:10.11779/CJGE20221546

Volume 46 Issue 4

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Chinese Journal of Geotechnical Engineering > 2024 > 46(4): 880-889. > DOI: 10.11779/CJGE20221546

ZHANG Xianlei, YIN Chunjie, MA Zhongyang, GU Xiaoyu. Micropermeation mechanism of PVC-P geomembranes by low-field NMR technology[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(4): 880-889. DOI: 10.11779/CJGE20221546

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Micropermeation mechanism of PVC-P geomembranes by low-field NMR technology

North China University of Water Resources and Electric Power, Zhengzhou 450045, China

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Received Date: December 15, 2022
Available Online: June 01, 2023

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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.
- PVC-P geomembrane,
- infiltration flow,
- porosity,
- low-field NMR,
- T₂ characteristic spectrum

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Micropermeation mechanism of PVC-P geomembranes by low-field NMR technology

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