United States Department of Transportation
i
Optimization and management of materials in earthwork construction : final report, April 2010.
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2010-04-01
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[PDF-2.39 MB]
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Edition:Final report; April 2010.
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Abstract:As a result of forensic investigations of problems across Iowa, a research study was developed aimed at providing solutions to identified
problems through better management and optimization of the available pavement geotechnical materials and through ground
improvement, soil reinforcement, and other soil treatment techniques. The overall goal was worked out through simple laboratory
experiments, such as particle size analysis, plasticity tests, compaction tests, permeability tests, and strength tests. A review of the
problems suggested three areas of study: pavement cracking due to improper management of pavement geotechnical materials,
permeability of mixed-subgrade soils, and settlement of soil above the pipe due to improper compaction of the backfill. This resulted in
the following three areas of study:
• The optimization and management of earthwork materials through general soil mixing of various select and unsuitable soils
and a specific example of optimization of materials in earthwork construction by soil mixing
• An investigation of the saturated permeability of compacted glacial till in relation to validation and prediction with the
Enhanced Integrated Climatic Model (EICM)
• A field investigation and numerical modeling of culvert settlement
For each area of study, a literature review was conducted, research data were collected and analyzed, and important findings and
conclusions were drawn. It was found that optimum mixtures of select and unsuitable soils can be defined that allow the use of
unsuitable materials in embankment and subgrade locations. An improved model of saturated hydraulic conductivity was proposed for
use with glacial soils from Iowa. The use of proper trench backfill compaction or the use of flowable mortar will reduce the potential
for developing a bump above culverts.
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