DYWIDAG-Systems International (DSI) is America’s leading manufacturer & supplier of specialist ground support products to the underground coal & metalliferous mining sectors. They also are one of the suppliers of hollow core or self-drilling soil nails.
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TerraSystems Incorporated
TerraSystems is a geotechnical contracting firm specializing in dynamic compaction, rammed aggregate columns, wick drains, and various vibro systems for improving poor soil conditions. They are based in Lovettsville, Virginia. Visit TerraSystems Incorporated
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Stone Strong
Stone Strong is the largest precast retaining wall block available on the market measuring 3′ by 8′, weighing 6,000 lbs. This block is not misplaced easily. Visit Stone Strong
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FHWA Geotechnical Engineering Publications
For transportation related geotechnical engineering, these publications are an absolute must! But all practicing geotechs should find something useful. Visit FHWA Geotechnical Engineering Publications