<p><p><strong>Reference(s):<br></strong><em>Ayadat and Hanna (2005)</em><ol> <li>Determine the collapse potential of the soil based on the following equation:<br><p style="text-align: center;"><em>CP = ΔH/H₀</em></p>where,</p><p><em> CP</em> = collapse potential<br><em> ΔH</em> = settlement of the foundation, with and without a stone column<br><em> H₀</em> = thickness of the collapsible lay

<p><p><h2>Commentary</h2>The costs of Geotextile Encased Columns (GECs) on a highway project should be captured in a contract bid item which is measured by the lineal foot (LF). Included in this bid item are the material, equipment, labor, and incidentals to construct a GEC.

<p><p><figure id='attachment_2596' style='max-width:947px' class='caption alignnone'><img class="wp-image-2596 size-full" style="border: 2px solid #696969;" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Diagram showing the construction sequence of geosynthetic encased columns using the displacement method." width="947" height="496" /><figcapti

<p><p><strong>References:<br></strong><em>Brokemper et al.

<p><p><strong>References:<br></strong><em>Mauer (2001)</em></p><p><strong>Method Summary</strong></p><p>The installation of the column should be monitored to ensure the column has been installed in the correct location and to the correct depth. This can be done with manual or automated systems. One example of an automated system is a pile driver equipped with GPS locating equipment.

<p><p><strong>Reference(s):<br></strong><em>Raithel et al. (2005)</em></p><p>Design of a GEC can be performed with finite element modeling. This can be completed with PLAXIS or other numerical modeling programs. This modeling program is well suited for GECs because a number of different soil models can be used. The Soft Soil Model, which is a model based on the Cam-Clay type, is used for the softest soils. For the column material which is made up of sands and gravels, the Hard Soil Model is used.