Page 1 of 3 SealGuard / Sub-Technical Case Study – Ground Consolidation using HyperFlex Challenge Faced One of our most recent projects was sited at a newly constructed rail tunnel in southern Mississippi that was designed to carry a two lane roadway over it. This tunnel replaced 2 prior bridge structures, which had collapsed. An 800 foot corrugated metal tunnel liner was installed and the small valley back filled using sand and plastic grid material to hold it in place. The roadway was then rebuilt over the tunnel on the compacted fill material. Total depth of the tunnel is 75 feet from the rail bed to the road surface, 20 feet from the top of the tunnel to the road surface. When Hurricane Isaac hit the heavy rain exposed se

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