Theoretical Qs For Exam Flashcards
Differentiate between a shallow and deep foundation
A shallow foundation is a foundation that conforms to the ratio of D/B <=1
Whilst deep foundation extends more that D/B
Differentiate between ultimate bearing capacity and allowable bearing pressure
Q ult is maximum pressure that the soil can be subjected to without undergoing failure
Allowable bearing capacity is the maximum allowable pressure that a soil can be exposed to, when incorporating a factor of safety
What are the basic modes of failure for earth slopes ? Slope stability Q
Circular rotational failure
Non-cicular failure
Translational failure
Wedge failure
Briefly outline 3 remedial measures that can be undertaken against failure of slopes
Reducing angle of slope
Geo synthesis to increase soil strength
Soil nails
Soil replacement
Give 4 modes of failure in retaining structures
Sliding along base
Overturning
Bearing capacity failure
Overall failure
Possible causes of slope of failure ..how to mitigate or prevent this from happening
Seepage
Soil erosion
Earthquake
Overloading
Making slope less steep
Soil replacement
Plant vegetation to stabilise the soil through plant roots
Implementing drainage methods to control water flow and minimize the hydrostaticpressure build up
What is the difference between end bearing piles and friction piles?
End-bearing piles’ capacity is derived from penetration resistance of the soil at the toe of the pile
Whilst friction pile’ carrying capacity is derived from the friction of the soil in contact with the shaft of the pile
What is the difference between end bearing piles and friction piles?
End-bearing piles’ capacity is derived from penetration resistance of the soil at the toe of the pile
Whilst friction pile’ carrying capacity is derived from the friction of the soil in contact with the shaft of the pile
What is the difference between end bearing piles and friction piles?
End-bearing piles’ capacity is derived from penetration resistance of the soil at the toe of the pile
Whilst friction pile’ carrying capacity is derived from the friction of the soil in contact with the shaft of the pile
What is the difference betweeen active and passive earth pressure
Active earth pressure is when the retaining structure is pushed away from the backfill
Whilst passive earth pressure is when the retaining structure moves into backfill
