The Montana Department of Transportation (MDT) was plagued with nine shallow and deeper-seated landslides at six sites throughout the eastern two-thirds of the state. To repair the sites quickly, effectively, and at the least cost, MDT put out a design/build solicitation for landslide mitigation at all the sites.
GeoStabilization International®, a slope stabilization expert, teamed with Great West Engineering out of Helena, Montana, for the engineered slope repair project. The team scored highest on both the Statement of Qualifications and the technical score and, most importantly, came in 2.8 million dollars under the next responsive bidder. After the project’s award, GeoStabilization allocated up to 5 crews working concurrently to ensure the project was completed on time. Our equipment experts designed and built unique grout plants that could keep working in the sub-zero temperatures of Montana’s “spring.” MDT, impressed with the work as it progressed, added a seventh site to the list during construction.
When GeoStabilization’s crews installed the SuperNails®, they had to utilize limited access drill rigs and special procedures to ensure their safety due to the severity of the slopes’ grade. Working in sections, once the 1,800-each soil nails were drilled into the slope, more than 32,000 square feet of galvanized high-strength mesh and 21,000 square feet of shotcrete were used for slope facing and soil retention. Once the wire mesh was placed on the slope, it was secured with bearing plates and nuts to the soil anchors. When the shotcrete facing was used, a steel-reinforcing element was connected to the soil nails. The shotcrete was sprayed to the slope’s surface and encapsulated as the reinforcing element.
GeoStabilization finished all seven sites before the original six-site deadline. As usual, no contractor-initiated change orders were made, with the only change in scope being that requested by MDT. Each of these projects is supported by GeoStabilization’s industry-leading multi-year performance warranty.
Contact GeoStabilization International® at 855-579-0536 to learn how to utilize our geohazard mitigation services for your geotechnical applications. Our teams have provided residential slope stabilization, slope monitoring, slope protection, and landslide mitigation services for over twenty years.
If you are interested in a no-obligation site visit to determine if our services fit your geohazard mitigation needs, call us at 855-579-0536 or fill out our contact form.
