Monitoring culvert load with shallow filling under Geofoam areas.
-
2008-08-01
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:Geofoam and the "Imperfect Ditch" method can be used effectively on embankment projects to reduce pressures on underground structures when sufficient fill height is available to create an arching effect. When the fill height is too shallow the arching effect cannot be created. However, the pressure acting on the underground structure can still be reduced by making use of the very small unit weight of lightweight geofoam material. In this study, stresses acting on a three-sided culvert were reduced using lightweight geofoam. Initially, the culvert had been designed to carry a 6-foot loading. During construction it was discovered that the culvert must support a 9-foot embankment loading. In an attempt to maintain the original design pressure and accommodate the increased height of backfill, the contractor proposed substituting 2 feet of the fill soil with 2 feet of ultra-light weight geofoam. To check the proposed solution, stress cells were installed on the three-sided culvert to measure actual in situ pressures. Using measured pressures acting on the culvert, a numerical model (by using FLAC 4.0) was "calibrated" properties of the fill materials, pressures were calculated for fill heights with and without geofoam. Pressures obtained from the calibrated model involving 7 feet of fill and a 2-foot layer of geofoam are compared to the pressures obtained for the 6 feet of fill.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
File Type:
Supporting Files
-
No Additional Files
More +