Soil Mechanics Exam #3
If a bedrock soil was changed out with sand, the time it should take for settlement to
occur would be _____________ but the overall amount of settlement that occurs will be
________________ - ✔️✔️less, same
Define compaction - ✔️✔️the increase in unit weight obtained by controlled
densification
Amount of settlement is ____________ to the 1D strain caused by variation in effective
stress - ✔️✔️proportional
Rate of settlement is a function of - ✔️✔️soil type, geometry of the profile,
mathematical solution between a time factor and percent consolidation occurred.
What is H* - ✔️✔️the total height of clay/by the number of drainage faces
Define Normally consolidated clay - ✔️✔️the current stress is the max the soil has ever
had
Define OVerconsolidated - ✔️✔️the maximum stress occured in the past (Max
pressure past>current stress)
Define Consolidation - ✔️✔️settlement that occurs over time in fine grained soils
Define the Virgin Consolidation Curve - ✔️✔️the line on the e-log p curve that signifies
the first time the soil experiences that stress
Define Controlled Densification - ✔️✔️process of increasing the density using the
modification of the water content and mechanical manipulation
Fine Soils use _________________________ test for compaction - ✔️✔️Ralph R.
Proctor
Coarse Soils _______________________ test for compaction - ✔️✔️relative density
test
The peak dry unit weight is called - ✔️✔️maximum dry density
The optimum water content is based - ✔️✔️the maximum dry density
, What is the Zero air void curve - ✔️✔️max dry density that would occur if all void space
were filled with water
What is the typical range of acceptable water contents - ✔️✔️+ or- 3-2%
Define the Terzaghi and Peck model - ✔️✔️different pipes at different depths in the
clay and how they are affected.
As the load P increases, the void ratio of the solid __________ - ✔️✔️decreases
Any point on the e-log p-curve that is straight is called the _______________
___________________ curve - ✔️✔️virgin consolidation
A soil's void ratio at any time is dependent on _____________ ______________ -
✔️✔️max. stresses
Dry side of optiumum is the ___________ side of the compaction curve - ✔️✔️left
the left side of the compaction curve is ______________ soil structure -
✔️✔️flocculated
the wet side of optimum is the ____________ side of the compaction curve - ✔️✔️right
______________________ soil structure gives a higher strength - ✔️✔️flocculate
More plastic ductility occurs with _____________ soil structures, in __________ soils -
✔️✔️dispersed, wetter
Brittle soils are ____________ and ______________ soil structures - ✔️✔️dry,
flocculated
Hydraulic conductivity ___________ with increased water content - ✔️✔️Increase
Sheepsfoot, padfoot and pneumatic rollers are used for - ✔️✔️fine grained soils
Define a sheepsfoot roller - ✔️✔️suitable for compacting clayey soils
Contact pressures are from 1400-1700kPa and 200-1000 psi
Define a Padfoot Roller - ✔️✔️suitable for proof rolling of subgrades, finishing of fills
with sandy and clayey soils
Contact pressures are from 310-380kPA (45-55psi)
If a bedrock soil was changed out with sand, the time it should take for settlement to
occur would be _____________ but the overall amount of settlement that occurs will be
________________ - ✔️✔️less, same
Define compaction - ✔️✔️the increase in unit weight obtained by controlled
densification
Amount of settlement is ____________ to the 1D strain caused by variation in effective
stress - ✔️✔️proportional
Rate of settlement is a function of - ✔️✔️soil type, geometry of the profile,
mathematical solution between a time factor and percent consolidation occurred.
What is H* - ✔️✔️the total height of clay/by the number of drainage faces
Define Normally consolidated clay - ✔️✔️the current stress is the max the soil has ever
had
Define OVerconsolidated - ✔️✔️the maximum stress occured in the past (Max
pressure past>current stress)
Define Consolidation - ✔️✔️settlement that occurs over time in fine grained soils
Define the Virgin Consolidation Curve - ✔️✔️the line on the e-log p curve that signifies
the first time the soil experiences that stress
Define Controlled Densification - ✔️✔️process of increasing the density using the
modification of the water content and mechanical manipulation
Fine Soils use _________________________ test for compaction - ✔️✔️Ralph R.
Proctor
Coarse Soils _______________________ test for compaction - ✔️✔️relative density
test
The peak dry unit weight is called - ✔️✔️maximum dry density
The optimum water content is based - ✔️✔️the maximum dry density
, What is the Zero air void curve - ✔️✔️max dry density that would occur if all void space
were filled with water
What is the typical range of acceptable water contents - ✔️✔️+ or- 3-2%
Define the Terzaghi and Peck model - ✔️✔️different pipes at different depths in the
clay and how they are affected.
As the load P increases, the void ratio of the solid __________ - ✔️✔️decreases
Any point on the e-log p-curve that is straight is called the _______________
___________________ curve - ✔️✔️virgin consolidation
A soil's void ratio at any time is dependent on _____________ ______________ -
✔️✔️max. stresses
Dry side of optiumum is the ___________ side of the compaction curve - ✔️✔️left
the left side of the compaction curve is ______________ soil structure -
✔️✔️flocculated
the wet side of optimum is the ____________ side of the compaction curve - ✔️✔️right
______________________ soil structure gives a higher strength - ✔️✔️flocculate
More plastic ductility occurs with _____________ soil structures, in __________ soils -
✔️✔️dispersed, wetter
Brittle soils are ____________ and ______________ soil structures - ✔️✔️dry,
flocculated
Hydraulic conductivity ___________ with increased water content - ✔️✔️Increase
Sheepsfoot, padfoot and pneumatic rollers are used for - ✔️✔️fine grained soils
Define a sheepsfoot roller - ✔️✔️suitable for compacting clayey soils
Contact pressures are from 1400-1700kPa and 200-1000 psi
Define a Padfoot Roller - ✔️✔️suitable for proof rolling of subgrades, finishing of fills
with sandy and clayey soils
Contact pressures are from 310-380kPA (45-55psi)
