Published: Jan 2000
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This paper presents the consolidation settlement and the excess pore pressure dissipation behavior of a four-lane highway embankment constructed over an abandoned quarry filled with a lime waste. The embankment was about 1000 ft (305 m) long and 45 to 50 ft (13.5 to 15 m) high with side slopes of 2(h):l(v). The supporting quarry, approximately 60 ft (18 m) deep, consisted primarily of a lime waste with very small amounts of asphalt coal tar, flyash, brick cinders, crushed limestone, and others. The lime waste was a residue derived from extraction of magnesium out of dolomitic rock and had calcium carbonate as the main chemical component. It had a natural water content as high as 124%, a specific gravity of 2.59, a liquid limit of 72%, and a plasticity index of 19.
The field data showed that the embankment slopes were stable without visible lateral isplacement, and that more than 10 ft (3 m) of consolidation settlement occurred at the deepest part of the quarry. The measured settlement and excess pore water pressure data were compared with the results of analysis. Possible causes for the observed discrepancy were discussed in detail.
Lime waste, highway embankments, consolidation settlement, excess pore pressure, performance, field monitoring, field testing, laboratory testing, analysis
Project Engineer, GTS Technologies, Inc., Harrisburg, PA
Professor of Civil Engineering, Pennsylvania State University, University Park, PA