Boyd Ramsey, GSE Chief Engineer
Boyd Ramsey, GSE Chief Engineer
Boyd Ramsey, GSE Chief Engineer
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GCL Hydraulic Conductivity<br />
• Unlike compacted clays, GCL<br />
permeability varies with effective stress.<br />
• The greater the effective stress (load)<br />
the lower the GCL’s permeability.<br />
• Can vary as much as 10X in landfill<br />
bottom liners, i.e. as constructed to final<br />
fill.<br />
• Hydraulic Conductivity<br />
‒ ASTM D5887<br />
‒ Effective Confining Stress is 5 psi<br />
‒ Typical Value is 3 x 10 -9 cm/sec<br />
* Petrov, R.J. et al (1997) “Equations for Calculating the Rate of Liquid Migration Through Composite Liners Due to Geomembrane Defects”.<br />
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