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Each sample originally 76 mm long and 38 mm in diameter, experienced a vertical deformation of 5.1 mm. Draw the failure envelope and determine the Coulomb equation for the shear strength of the soil.

Geotechnical Engineering Laboratory Coursework

Answer ALL questions showing ALL calculation steps clearly. Where graphs are required you MUST use either actual graph papers (not plain paper) or Excel plotting. Make sure the plotted data points and connecting curves/lines are clear and tidy. Label the axes of graphs and indicate the measurement units.

10% of the module mark

 QUESTION 1

The following results were obtained from a series of consolidated undrained triaxial tests carried out on undisturbed samples of a compacted soil.

Test No.

Cell pressure (kPa)

Additional axial load at failure (N)

1

200

342

2

400

388

3

600

465

Each sample originally 76 mm long and 38 mm in diameter, experienced a vertical deformation of 5.1 mm. Draw the failure envelope and determine the Coulomb equation for the shear strength of the soil.

QUESTION 2

An undisturbed soil sample was tested in a falling head permeameter. The results were:

Initial head of water in stand-pipe

1500 mm

Final head of water in stand-pipe

  605 mm

Duration of test

  281 s

Sample length

  150 mm

Sample diameter

  100 mm

Stand-pipe diameter

      5 mm

Calculate the coefficient of permeability of the soil in m s–1.

QUESTION 3

The following results were obtained from a compaction test using the 2.5 kg rammer:

Test No.

Mass of mould + wet soil (g)

Moisture content (%)

1

2783

  8.1

2

3057

  9.9

3

3224

12.0

4

3281

14.3

5

3250

16.1

6

3196

18.2

The mass of the compaction mould excluding collar and base was 1130 g and the soil had a particle specific gravity of 2.70. Plot the curve of dry density versus moisture content. On the same graph plot the curves representing 5% and 0% air voids. Determine the optimum moisture content for the soil.


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