Geotech Week 9 Quiz

How are you feeling about Geotech?

• 
• 
• 
• 

If this coke can was a pile, what would its As and Ab values be?

• As = red part (area of shaft)
  
  Ab = circular bottom (area of bottom)

• As = volume (area of soft drink)

  Ab = colour (A brown drink)

• As = circular top (area of surface)

  Ab = circular bottom (area of bottom)

• As = Australian Standards (AS4100)

  Ab = Albanian Standards (AB3800)

What is true about the material properties in this question?

• 1. Unit weight of soil is 18kN/m3

  2. Elastic modulus of soil is 40 MPa

  3. Elastic modulus of pile is 20,000 MPa

• 1. Unit weight of pile is 18kN/m3

  2. Elastic modulus of soil is 40 MPa

  3. Elastic modulus of pile is 20,000 MPa

• 1. Unit weight of soil is 18kN/m3

  2. Elastic modulus of solid material is 40 MPa

  3. Elastic modulus of plastic material is 20,000 MPa

• 1. Unit weight of plastic material is 18kN/m3

  2. Elastic modulus of solid material is 40 MPa

  3. Elastic modulus of plastic material is 20,000 MPa

What would the important stress values be for this pile in sand?

• σ'v = 18*3 = 54 kPa

  σ'vb = 18*6 = 108 kPa

• σ'v = 40*3 = 120 kPa

  σ'vb = 40*6 = 240 kPa

• σ'v = 1/2*volume*18 = 10.6 kPa

  σ'vb = 1/2*volume*18 = 21.2 kPa

For this rectangular pile, which pile strengths components do we need?

• Ps + Pb

  where Ps is in the interface between sand and gravel layers

• Ps_sand + Ps_gravel + Pb

• Ps_sand + Pb_sand + Ps_gravel + Pb_gravel

The important stress value(s) to calculate in order to determine the pile strength are at which depths?

• depths (m) = 1, 3, 5, 7, 8

• depths (m) = 2, 5, 7, 8

• depth (m) = 5

What are the failure modes for this group of piles?

(Tick ALL options that apply)

• The sum of the individual pile capacities

• The block failure including the soil in between the piles