TY - JOUR
T1 - Some aspects of air-entrainment on decay rates in hydraulic pulse tests
AU - Selvadurai, A. P.S.
AU - Ichikawa, Y.
N1 - Funding Information:
The work described in this paper was supported in part by the 2003 Max Planck Forschungspreis in Engineering Sciences , awarded to the first author by the Max Planck Gesellschaft, Berlin, Germany and through a Discovery Grant awarded by the Natural Sciences and Engineering Research Council of Canada The authors wish to express their thanks to the reviewers for their constructive comments and to Professor Claudio Mancuso (Università degli Studi di Napoli Federico II) and Professor Cristina Jommi (Politecnico di Milano) for the opportunity to contribute to the Special Issue of the Journal devoted to Unsaturated Soils.
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/10/24
Y1 - 2013/10/24
N2 - Important factors that can influence interpretation of the pulse tests include the compressibility and viscosity of the fluid that either saturates the pore space of the rock or is used to pressurize the chamber, which generates the pressure pulse. Fluid compressibility can be influenced by entrained air. This paper examines theoretically, the influence of compressibility and viscosity variations in both the interstitial pore water and within the pressurizing chamber, on the performance of the hydraulic pulse test. Convenient analytical results can be derived to account for variations in compressibility and viscosity resulting from entrained air. Theoretical results indicate that the entrained gas content can have an appreciable influence on the pressure decay curves, and particularly high volume fractions of the entrained air can influence the estimation of the permeability from hydraulic pulse tests. The paper concludes with a brief discussion of the influence of dissolved air on the performance of pulse tests.
AB - Important factors that can influence interpretation of the pulse tests include the compressibility and viscosity of the fluid that either saturates the pore space of the rock or is used to pressurize the chamber, which generates the pressure pulse. Fluid compressibility can be influenced by entrained air. This paper examines theoretically, the influence of compressibility and viscosity variations in both the interstitial pore water and within the pressurizing chamber, on the performance of the hydraulic pulse test. Convenient analytical results can be derived to account for variations in compressibility and viscosity resulting from entrained air. Theoretical results indicate that the entrained gas content can have an appreciable influence on the pressure decay curves, and particularly high volume fractions of the entrained air can influence the estimation of the permeability from hydraulic pulse tests. The paper concludes with a brief discussion of the influence of dissolved air on the performance of pulse tests.
KW - Air-entrainment
KW - Compressibility of pore fluid
KW - Hydraulic pulse tests
KW - Permeability measurement
KW - Pulse decay patterns
KW - Rocks with gassy fluids
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U2 - 10.1016/j.enggeo.2013.05.023
DO - 10.1016/j.enggeo.2013.05.023
M3 - Article
AN - SCOPUS:84886789594
SN - 0013-7952
VL - 165
SP - 38
EP - 45
JO - Engineering Geology
JF - Engineering Geology
ER -