Environmental Engineering Reference
In-Depth Information
FIGURE 2.87
Vertical extrusion of Shelby tube sample in the same direction as taken in the field to minimize disturbance.
(Courtesy of Joseph S. Ward and Assoc.)
vertical, as shown in Figure 2.87. This procedure avoids the effects on sample quality of
reverse wall friction and of the sample's passing the cutting edge of the tube.
Thin-Wall Cored Samples
Because they contain strong cohesive soils, wall friction in cored soil samples is usually too
high to permit extrusion from the entire tube without causing severe disturbance. Removal
normally requires cutting the tube into sections and then extruding the shorter lengths.
