<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Harold W. Olsen</dc:contributor>
  <dc:contributor>Karl R. Nelson</dc:contributor>
  <dc:contributor>James D. Gill</dc:contributor>
  <dc:creator>Roger H. Morin</dc:creator>
  <dc:date>1989</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;A graphical method has been developed for determining the coefficient of consolidation from the transient phases of a flow-pump permeability test. The flow pump can be used to infuse fluid into or withdraw fluid from a laboratory sediment specimen at a constant volumetric rate in order to obtain data that can be used to calculate permeability using Darcy's law. When the initial transient-response curve (hydraulic head as a function of time) generated by this test is examined analytically in terms of a one-dimensional consolidation process, representative type-curve solutions to the associated forced-flow and pressure-decay models are derived. These curves provide the basis for graphically evaluating the permeability&amp;nbsp;&lt;/span&gt;&lt;i&gt;k&lt;/i&gt;&lt;span&gt;, the coefficient of consolidation&amp;nbsp;&lt;/span&gt;&lt;i&gt;c&lt;sub&gt;v&lt;/sub&gt;&lt;/i&gt;&lt;span&gt;, and the coefficient of volume change&amp;nbsp;&lt;/span&gt;&lt;i&gt;m&lt;sub&gt;v&lt;/sub&gt;&lt;/i&gt;&lt;span&gt;. The curve-matching technique is easy and rapid, and it can be applied to results of forced-flow tests, both infusion and withdrawal, as well as to subsequent pressure-decay records. Values of&amp;nbsp;&lt;/span&gt;&lt;i&gt;k, c&lt;sub&gt;v&lt;/sub&gt;&lt;/i&gt;&lt;span&gt;, and&amp;nbsp;&lt;/span&gt;&lt;i&gt;m&lt;sub&gt;v&lt;/sub&gt;&lt;/i&gt;&lt;span&gt;&amp;nbsp;for a laterally confined kaolinite specimen were determined by this graphical method and appear to be in reasonably good agreement with numerically derived estimates (within 20%). Discrepancies between the two sets of results seem to be largely a function of data quality rather than of method of analysis. Where responses of hydraulic head as a function of time are apparently unaffected by experimental sources of error, agreement is excellent (within 4%). Application of this graphical method to triaxial testing has inherent uncertainties, because the solution curves that describe one-dimensional deformation are used to analyze a three-dimensional process.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1520/GTJ10989J</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>ASTM</dc:publisher>
  <dc:title>Graphical method for determining the coefficient of consolidation c from a flow-pump permeability test</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>