Question

Problem 2 (26 points) Results from a standard Proctor compaction test yield an Optimum Moisture Content (OMC) of 12% and a maximum dry unit weight of 18.1 kN/m. Given this information, address the following questions. a) The soil was used to construct an embankment on a construction site. A sand cone test indicated that a layer of the compacted fill had a total unit weight of 19.8 kN/m3 and a moisture content of 11%. Specifications call for the compacted soil to achieve a relative compaction of at least 95% based on standard Proctor dry unit weight. Determine whether the soil tested at the site meets specifications, show your calculations. (6 pts) b) The borrow source for this soil has, on average, a dry unit weight of 17.6 kN/m3 and a moisture content of 9%. What will be the volume of the excavation (in my at the borrow source that will result from producing an embankment fill with a volume of 150,000 m3, an average total unit weight of 20.3 kN/m3 and an average moisture content of 12%? How much water (in kg) will have to be added to the embankment to achieve this moisture content? (13 pts) c) Lab testing revealed this soil to have a Liquid Limit of 52% and Plastic Limit of 20%; 100% ofthis soil passed the #4 sieve and 13% passed the #200 sieve. Provide the USCS Group Symbol and Group Name. (7 pts)

Soil Mechanics

Answer 1

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