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City of Orlando had an evaluation performed on one of their large gravity sewer mains in March, 1999 using a combination of seismic tomographic imaging (STI) to evaluate soil conditions around the gravity sewer main, and physical inspection of the pipe interior. The evaluation was intended to identify areas of impending subsidence and roadway collapses resulting from infiltration. The results of STI using the SEWREEL technique showed very loose soil conditions at a number of locations along the gravity main which for the most part could not be corroborated by the interior physical inspection.

Approximately 16,000 linear feet of the 20,000 linear-foot gravity sewer main, known as the Crane Strand Wastewater Interceptor, were evaluated using SEWREEL. The gravity main in this area consists of 72- and 78-inch diameter reinforced concrete pipe with an interior PVC liner. Twelve locations identified by SEWREEL, plus two additional locations identified by subsidence or internal inspection, were subsequently grouted as a preventive measure. This grouting activity verified that, in most cases, loose soils and voids existed where the SEWREEL images indicated. By proactively filling the loose soils and voids, the City has saved hundreds of thousands of dollars for emergency road repairs, damaged pipeline, damaged vehicles, and injuries, several times the cost of the SEWREEL evaluation.
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Document Type: Research Article

Publication date: 2000-01-01

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