Evaluating the Hydraulic Conductivity of Dense Nonaqueous Phase Liquid in a Single Fracture of Rock-like Material

Meng Chia Weng, Chiou Liang Lin*, Fu Shu Jeng, Hao Chih Ou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

To investigate the seepage characteristics of dense nonaqueous phase liquids (DNAPLs) in rock fractures, two types of NAPLs (paint and creosote) were used in triaxial permeability tests conducted on single-fracture samples. The hydraulic conductivity of rock fractures with different apertures, confining pressures, and fluid properties was measured, and the influence of various physical factors on transmissivity was explored. The results demonstrated the following: (1) Fracture aperture and fluid viscosity are the main factors influencing transmissivity; (2) The widely used cubic law fails to effectively predict the transmissivity of high-viscosity liquids in a fracture, and the influence of liquid viscosity is considerably higher than that predicted by the cubic law; and (3) This study proposed a transmissivity prediction model of DNAPLs in a rock fracture based on multivariate regression analysis. The proposed model provides more accurate prediction results than those predicted by the cubic law, and is applicable to fracture apertures ranging from 5 × 10−4 to 2.5 × 10−3 m as well as to every kind of fluid used in this study.

Original languageEnglish
Article number2288
JournalSustainability (Switzerland)
Volume14
Issue number4
DOIs
StatePublished - 1 Feb 2022

Keywords

  • Aperture
  • Creosote
  • Cubic law
  • Dense nonaqueous phase liquids (DNAPL)
  • Rock fracture

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