<p><p><figure id='attachment_1496' style='max-width:489px' class='caption aligncenter'><img class="wp-image-1496 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Photographs of multiple jet grouting rigs at a project site." width="489" height="364" /><figcaption class='caption-text'> Multiple jet grouting rigs. Photograph courtesy of Soilmec S.p.A. (2006)</figcaption></figure></p><p>In this technique, cement-based grouts are injected at high velocities from jets at the base of the drill string . As the string is withdrawn from the soil and rotated slowly, the grout jet cuts and mixes the soil for a finite distance around the drill string forming column elements. The erosive/mixing action of the jet of grout can be enhanced in various proprietary systems by the supplemental simultaneous application of high pressure air and/or water. Advantages include a nearly unlimited configuration of column geometry, installation in areas of limited headroom, and use in a wide range of soil types and groundwater conditions. This technique is applicable to new embankments and embankment widening.</p><p>