A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Monitoring Culvert Load with Shallow Filling Under Geofoam Areas
Geofoam and the 'Imperfect Ditch' method can be used effectively on embankment projects to reduce pressure 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' to back calculate pressure for the original design situation involving the fill height of 6 feet. Using the '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.
Monitoring Culvert Load with Shallow Filling Under Geofoam Areas
Geofoam and the 'Imperfect Ditch' method can be used effectively on embankment projects to reduce pressure 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' to back calculate pressure for the original design situation involving the fill height of 6 feet. Using the '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.
Monitoring Culvert Load with Shallow Filling Under Geofoam Areas
C. Sun (author) / T. C. Hopkins (author)
2008
20 pages
Report
No indication
English
Civil Engineering , Construction Equipment, Materials, & Supplies , Culverts , Monitoring , Dynanmic loads , Soils , Stress reduction , Highway , Embankments , Buried objects , Numerical analysis , Backfilling , Lagrangian function , Calibration , Design , Construction , Kentucky , Data collection , Gelfoam
Load Reduction by Geofoam for Culvert Extension: Numerical Analysis
| British Library Conference Proceedings | 2006
Long-Term Monitoring of Culvert Load Reduction Using an Imperfect Ditch Backfilled with Geofoam
| British Library Online Contents | 2011
Numerical Analysis of Load Reduction Using Geofoam for Rigid Culvert under High Embankment
| British Library Conference Proceedings | 2008