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Theoretical Evaluation of the Transient Response of Constant Head and Constant Flow-Rate Permeability Tests

Geotechnical Testing Journal

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Abstract

A theoretical analysis is presented that compares the response characteristics of the constant head and the constant flowrate (flow pump) laboratory techniques for quantifying the hydraulic properties of geologic materials having permeabilities less than 10-10 m/s. Rigorous analytical solutions that describe the transient distributions of hydraulic gradient within a specimen are developed, and equations are derived for each method. Expressions simulating the inflow and outflow rates across the specimen boundaries during a constant-head permeability test are also presented. These solutions illustrate the advantages and disadvantages of each method, including insights into measurement accuracy and the validity of using Darcy's law under certain conditions. The resulting observations offer practical considerations in the selection of an appropriate laboratory test method for the reliable measurement of permeability in low-permeability geologic materials.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Theoretical Evaluation of the Transient Response of Constant Head and Constant Flow-Rate Permeability Tests
Series title:
Geotechnical Testing Journal
Volume
21
Issue:
1
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geotechnical Testing Journal
First page:
52
Last page:
57
Number of Pages:
6