Pauline Leota
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Diploma Geotechnical Engineering 2 Quiz on Geotech 2 Soil Pressure, created by Pauline Leota on 16/05/2015.

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Pauline Leota
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Geotech 2 Soil Pressure

Question 1 of 12

1

The pressure at depth in a soil can be divided into two parts :

Select one of the following:

  • 1 .The pressures due to density of overlying soil
    2 .The pressures due to loads applied on the surface of the soil.

  • 1. the pressure due to the colour of the soil
    2. the pressure due to the weight of its smell

Explanation

Question 2 of 12

1

The total stress of the soil can be found with which formula

Select one of the following:

  • sigma = rho . g . h

  • u = rho(w) .g . h(w)

  • sigma' = sigma - u

Explanation

Question 3 of 12

1

Total Stress is the stress or pressure calculated by multiplying bulk density by depth.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 12

1

Pore Water Pressure u =rho (w) .g . hw

Select one of the following:

  • True
  • False

Explanation

Question 5 of 12

1

Effective Stress '
is numerically equal to Total stress - pore water pressure.

Effective Stress ' = Total stress - Pore water pressure u

Select one of the following:

  • True
  • False

Explanation

Question 6 of 12

1

Where the foundation shape is not symmetrical the pressure beneath the foundation will vary with lateral position as well as depth. The pressure under any corner of the foundation at a particular depth can be computed using a Newmark Chart

Select one of the following:

  • True
  • False

Explanation

Question 7 of 12

1

What is the procedure for drawing a Newmark chart?

Select one or more of the following:

  • 1. The depth at which it is proposed to calculate the depth is decided.

  • 2. The plan of the foundation is drawn so that the unit distance AB shown on the chart = depth.

  • 3. Each corner of the plan is placed at the centre of the chart and the number of segments
    covered is counted.

  • 4. Pressure at that corner at that depth is calculated by multiplying the number of segments x
    applied surface stress q influence factor for the chart (0.005)

  • Pressure = N x q x I

  • 5. If pressure at a different depth is required repeat steps 2-4 with AB = depth.

Explanation

Question 8 of 12

1

What is Active Earth Pressure?

Select one of the following:

  • Pressure of the soil which results from a slight movement of the structure away from the soil. This is the minimum pressure that the soil can apply.
    The amount of movement required varies with the soil type as the following table shows.

  • pressure that a soil will exert when a slight displacement of the structure towards the soil occurs. This is the maximum pressure that a soil can exert.

Explanation

Question 9 of 12

1

Passive Resistance or Passive Earth Pressure of the soil is the pressure that a soil will exert when a slight displacement of the structure towards the soil occurs. Passive pressure is the maximum pressure that a soil can exert.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 12

1

In both methods we will assume that the backfill material behind the wall is dry cohesionless soil - a reasonable assumption where free draining scoria backfill is used and adequate drainage provided

Select one of the following:

  • True
  • False

Explanation

Question 11 of 12

1

What three types of surcharge loading are commonly encountered :

Select one or more of the following:

  • Distributed Loads

  • Line Loads

  • Point or Concentrated loads

  • Wide loads

  • Rectangular shaped loads

Explanation

Question 12 of 12

1

Distributed loads - Coulomb's method are Calculate force added to each wedge by multiplying Ws x top length of wedge x 1.0 and adding force to wedge weight.

Select one of the following:

  • True
  • False

Explanation

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