SoilMech_Fall2008_Exam2_SolutionSet

SoilMech_Fall2008_Exam2_SolutionSet - Name: Score: CE 3413...

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Unformatted text preview: Name: Score: CE 3413 —- SOIL MECHANICS FALL 2008 EXAM ll, PART 1 18 NOVEMBER 2008 (1) 25 pts Medical Supplies Distribution Center, Slidellz Louisiana This proposed structure will be constructed on a 100-ft by 250—ft fill pad that is four feet thick. Project specifications require that the fill material be a silty clay. The project specifications further require that the silty clay be placed and compacted so that each 8—inch lift has a relative compaction of at least 95 percent of the maximum dry density determined in accordance with a Standard Proctor compaction test. Finally, the project specifications require that the moisture content of the compacted material be within the range of 2% “dry of optimum” to 3% “wet of optimum”. A testing laboratory has performed the Standard Proctor compaction test on a sample of the silty clay proposed by the contractor. The results of this test were: Test Mold Weight of Soil Water Point Volume in Mold Content (ft3) (lbs) (%) 1 V4, 3.78 5.0 2 j 1/30 3.99 7.0 _ 3 j V30 4.18 10.0 G8 ‘2-72 4 j 1/30 4.29 12.0 5 1/30 l 4.33 14.0 6 1/30 l 4.23 16.5 7 1/30 | 4.20 20.0 (g) ; DES What is the minimum dry density that the contractor must achieve in the field? ( ) p 3 What is the range of moisture contents that will be acceptable for the compacted fill? Field density testing has been performed on the compacted fill that has been placed by the contractor to create Lifts 1, 2, and 3 of the fill pad. These tests show the following results: Lift 1 Field Density Test Data — yDRy = 112.0, w= 9.2% Lift 2 Field Density Test Data ~ My = 111.0, w = 13.8% Lift 3 Field Density Test Data — yDRY = 107.0, W: 16.5% (c) 3 pts The owner of the project has asked you to accept or reject the work that the contractor has performed in constructing these three lifts. What are your recommendations? Lift 1 Accept Reject Re—Test Lift 2 Accept Reject Re—Test Lift 3 Accept Reject Re—Test (d) 8 pts The contractor is proposing to obtain the silty clay from a borrow pit in which the soil has an in—situ water content of 35% and an in—situ unit weight of 116.9 pcf. if the contractor were to construct the fill so that it is compacted to a relative compaction of exactly 95% and a water content exactly equal to the optimum water content, how many cubic yards of silty clay will he need to excavate from the borrow pit? “Good News”—— Only four more questions on this exam. “Bad News” — You’ll see them tomorrow night. 47‘ " Li/fi/rf /— ' , w H34?“ H0197 1243.“) 11M my? lib-‘3) r é ( A; LIP? 1w AQ/‘fii‘; W gm Fm. \oD/rzi3* 0F ‘gmatog 0 [7M wavy/Z, For eégm’é‘ EMQWLU §c>\\ thb} [99.23% M{ ’ e3? w WWW”, Vwmo X [.249 {M CQMPAM‘ED Fm. loam; é? 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SoilMech_Fall2008_Exam2_SolutionSet - Name: Score: CE 3413...

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