HW05_Ch06

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Texas Tech University *

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3321

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Civil Engineering

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Dec 6, 2023

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CE 3321 Introduction to Geotechnical Engineering 1 of 4 Homework Assignment 05 1) A series of modified Proctor tests have been performed on a soil that has a G s of 2.70. The test results obtained are as follows: Test No. Mass of compacted soil + mold (kg) Water content test results Mass of can (g) Mass of can + moist soil (g) Mass of can + dry soil (g) 1 3.673 22.11 205.74 196.33 2 3.798 23.85 194.20 180.54 3 3.927 19.74 196.24 177.92 4 3.983 20.03 187.43 165.71 5 3.932 21.99 199.59 171.11 The mass of the empty mold was 1.970 kg. a) Plot the compaction curve as well as S = 100% curve (or zero-air-voids curve) and S = 80% curve. Show your sample calculations for Test No. 1 in your answer sheet. 16 16.5 17 17.5 18 18.5 19 0 5 10 15 20 25 Dry unit weight, γ d (kN/m 3 ) Water content, w (%) Compaction curve

CE 3321 Introduction to Geotechnical Engineering 2 of 4 b) Determine the maximum dry unit weight and optimum water content based on the modified Proctor test. c) If the required relative compaction is 98% of the maximum dry unit weight from the modified Proctor test, the dry unit weight in the field should be greater than _____________________ kN/m 3 . 2) A compacted fill, currently under construction, will support a proposed grocery store in Lubbock. The project specifications call for dry unit weight of the compacted fill to be at least 95% of the modified Proctor maximum and water content to be within ±2% of the Proctor optimum water content. One of the field density tests in the fill gave a total unit weight (  ) of 120 lb/ft 3 and a water content of 12%. A maximum dry unit weight (  d,max ) and an optimum water content ( w opt ) of the fill were determined to be 115 lb/ft 3 and 13%, respectively, from a series of modified Proctor tests. a) Compute the relative compaction based on the modified Proctor test. b) Have all the compaction specifications been met?

CE 3321 Introduction to Geotechnical Engineering 3 of 4 3) A drive cylinder test has been performed in a recently compacted fill for the embankment at Milwaukee Avenue and State Highway Spur 327. The project specification requires compacted dry unit weight of the fill to be at least 98% of γ d,max from standard Proctor test and water content to be within ±2% of the Proctor optimum water content. The maximum dry unit weight and the optimum water content from the standard Proctor test were 118 lb/ft 3 and 11.5%, respectively. The data obtained from the drive cylinder test were as follows: Cylinder diameter (internal) = 3.0 in Cylinder height (internal) = 6.0 in Weight of wet soil + cylinder = 5.15 lb Weight of dry soil + cylinder = 4.76 lb Weight of empty cylinder = 2 lb a) What is the field water content? b) What is the field dry unit weight? c) What is the relative compaction ( RC ) in percent? d) Have all the compaction specifications been met?

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CE 3321 Introduction to Geotechnical Engineering 4 of 4 4) A proposed building site requires 1200 yd 3 of imported fill. A suitable borrow site has been located and the soils there have a shrinkage factor of 13%. How many cubic yards of soil musts be excavated from the borrow site?

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