Montana DOT Rebuilds an Old Bridge with a New System

The State of Montana rebuilt the old bridge at the South Fork Dry Fork Marias River crossing using a new technology that used geosynthetic reinforced soil (GRS). The new two-lane bridge, which was also designed as a grizzly bear crossing, was also built using integrated bridge system (IBS) and was completed faster and at a lower cost. GRS-IBS is a new technology that uses a series of geotextile sheets and alternating layers of granular fill material to make a composite reinforcement that provides support for the bridge slab. This type of design provides a smooth transition from the road to the bridge because the construction is jointless and there is no approach slab. The combination of the tensile strenght of the geotextile and the compressive strength of the granular soil provides for a very strong internally support structure that is capable of handling substantial loads.


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  • Accession Number: 01525506
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 25 2014 9:23AM