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The work was funded by the Colorado Department of Transportation and the FHWA. Most of the work was done by the University of Colorado/Denver. We began in 1972 and followed the work by the USFS. Those folks wrote the first design manual, 1978. Dick Bell and Oregon State were also involved...

Woven vs nonwoven. So many misconceptions exist about the role of inclusions in soil. I noted Sir Al thinks geogrid is somehow superior to other inclusions. Rarely the case. We have built reinforced soil structures with bed sheets from J. C. Penny to illustrate that it is the presence of the...

We have had recent success with combination soil nails and horizontal drains installed with the Soil Nail Launcher (www.soilnaillauncher.com) Installing hollow steel bars on a tight pattern provides tensile capacity of the steel bar plus the drainage capability of close spaced drains. Very...

It was suggested that a plastic pipe could be inserted in the steel tube that would maintain the drain for a longer period.

A new tool introduced by the USFS in a demo can insert hollow steel tubes as horizontal drains. Cost of these drains is about $200 each. Any idea how long a steel pipe survives or how to calculate this? bob barrett bbarrett33@aol.com

Any thing with tensile strength can be used. We built and test loaded a reinforced soil bridge pier using cotton sheets from J. C. Penny. The video of this can be obtained from Colorado DOT research dept. The world seems brainwashed that reinforcements must be stiff in-air. Thus more...