AGR4305: Agricultural Soil Mechanics – Presentation Assessment Answer

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 C_AI_DCFG_AGE
Code: AGR4305
Agricultural Soil Mechanics – Presentation Assessment Answer
Assignment Task:
Question 1:
A dry soil with
G
s
= 2.71 is mixed with 16% by weight of water and compacted to produce a cylindrical sample of 38 mm diameter and 76 mm long with 6% air content. Calculate:
Hints: The three known parameters for this question are: G
s
= 2.71, W = 0.16, A
v
= 0.06. You will need to first find the soil bulk density for determining the final mass of the mixed soil and also the void ratio e.

Question 2:

An undrained soil sample has the effective shear strength parameters as: c’ = 25 kPa, ?’ = 30
o
. The total vertical and horizontal stresses acting at this sample are respectively ?
1
= 200 kPa and ?
3
= 100 kPa. No shear stress is also allowed to develop on the vertical and horizontal planes. Determine the pore pressure that causes the failure of this sample.
Hint: In this particular question, the Mohr-Coulomb failure criterion should be drawn and represented using c’ and ?’, rather than using c and ?. The solution procedure of this question is also somewhat “similar” to the last two examples given in the Week 2 lecture.

Question 3:

A subsoiler of 25cm width is to operate at a fixed depth of 0.6 m, with an attack angle varying between 5 to 30
o
. The subsoil being worked has ? = 1.8 t/m
3
, ? = 45
o
, ? = 30
o
, c = 45 kPa, and Ca = 20 kPa.

Predict (to within 5
o
accuracy) at what angle of attack the minimum draft will occur?

Determine the specific draft (kPa) at this particular angle.

Predict the draft force if the working depth of the subsoiler is increased to1.2 m at this particular angle.

Determine the draft force in the second pass if the above operation (1.2 m depth) is instead carried out in two stages of a first pass at 60 cm and a second at another 60 cm depth.

University: University of Southern Queensland
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