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Reduction of stresses on buried rigid highway structures using the imperfect ditch method and expanded polysterene : geofoam.
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2009-01-01
[PDF-2.72 MB]
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Abstract:This study provides strong evidences from both numerical model analysis and in-situ test data to indicate that geofoam is an ideal elasto-plastic material to reduce vertical load on top of rigid culvert resting on a rigid foundation. The load on the top of culvert can be reduced to 20 percent of traditional design load after two (2) feet thick of geofoam is placed on top of a culvert. Results from numerical model are more conservative when compared t o actual test data. As much as 57 percent of settlement from geofoam has been recorded. Stresses on the top of culvert where geofoam was placed have reached a relatively stable level which is expected at the yield point of the geofoam. This technology can be used in applications which require controlled pressure on rigid underground structure. Whether geofoam is used or not used, the model analysis and test data show that the earth pressure acting on the sidewall does not change significantly. Although the pressure acting on the sidewall is slightly higher when geofoam is used on top of culvert only, the value is still below the design value used by the Kentucky Transportation Cabinet. Use of geofoam placed in an imperfect trench significantly reduces the vertical stresses acting on the top of the culvert.
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