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[CE 162] Geotechnical Engineering I > LE 2 CONCEPTS (M7 - M12) > Flashcards

LE 2 CONCEPTS (M7 - M12) Flashcards

1
Q

The pressure transmitted through grain to grain at the contact points through a soil mass

A

Effective Stress

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2
Q

If the pores of a soil mass are filled with water and if a pressure induced into the pore water, tries to separate the grains, this pressure is termed as ______________

A

Pore Water Pressure (u)

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3
Q

TRUE OR FALSE

The higher the friction between the particles, the lower the effective stress

A

False

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4
Q

TRUE OR FALSE

The lower the effective stress, the lower the strength of the soil

A

True

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5
Q

TRUE OR FALSE

Increasing the pore water pressure decreases the effective stress, thereby
decreasing the strength

A

True

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6
Q

Assumption where surface load is assumed to be applied on soil that is bounded on one side and extends infinitely in all other directions

A

Semi-infinite

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7
Q

Assumption where surface load is assumed to be applied on soil that has the same soil properties with depth

A

Homogeneous

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8
Q

Assumption where surface load is assumed to be applied on soil that has the same soil properties in all directions

A

Isotropic

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9
Q

Assumption where surface load is assumed to be applied on soil that has recoverable strain where principle of superpostition is applicable

A

Linear elastic

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10
Q

General classes of surface load that is either point load, circular load, rectangular load

A

Finite Surface Load

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11
Q

General classes of surface load that is either fills, surcharges

A

Infinite Surface Load

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12
Q

A stress increase caused by the construction of foundations or other loads compresses soil layers

A

Compressibility

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13
Q

caused by the elastic deformation of dry soil and of moist and saturated soils without any change in the moisture content

A

Elastic settlement or Immediate settlement

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14
Q

result of a volume change in saturated cohesive soils because of expulsion of the water that occupies the void spaces

A

Primary consolidation settlement

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15
Q

observed in saturated cohesive soils and is the result of the plastic adjustment of soil fabrics

A

Secondary consolidation settlement

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16
Q

occurs directly after the application of a load without a change in the moisture content of the soil

A

Elastic Settlement

17
Q

When a saturated soil layer is subjected to a stress increase, the pore water pressure is increased suddenly

A

Primary consolidation settlement

18
Q

A simple ground improvement technique, where the soil is densified through external compactive effort

A

Compaction

19
Q

TRUE OR FALSE

Compaction increases the strength characteristics of soils, which increases the bearing capacity of foundations constructed over them

20
Q

TRUE OR FALSE

Compactions increase the amount of undesirable settlement of structures

21
Q

TRUE OR FALSE

Compaction increases the stability of slopes of embankments

22
Q

TRUE OR FALSE

Compaction causes more water seepage, swelling and contraction

23
Q

the maximum unit weight that a soil can attain using a specified means of compaction

A

Maximum dry unit weight

24
Q

the water content required to allow a soil to attain its maximum dry unit weight following a specified means of compaction

A

Optimum moisture content, OMC

25
Q

The four most common types of rollers

A
  1. Smooth-wheel rollers (or smooth-drum rollers)
  2. Pneumatic rubber-tired rollers
  3. Sheepsfoot rollers
  4. Vibratory rollers
26
Q

for proof rolling subgrades and for finishing operation of fills with sandy and clayey soils

A

Smooth Wheel Roller

27
Q
  • Better than the smooth-wheel rollers.
  • It is heavily loaded with several rows of tires.
  • for sandy and clayey soil compaction.
  • Compaction is achieved by a combination of pressure and kneading action.
A

Pneumatic Rubber-Tired Rollers

28
Q
  • drums with a large number of projections.
  • Most effective in compacting clayey soils
A

Sheepsfoot Roller

29
Q

extremely efficient in
compacting granular soils.

  • Vibrators can be attached to smooth-wheel, pneumatic rubber-tired, or sheepsfoot rollers to provide vibratory effects to the soil. The vibration is produced by rotating off-center weights.
A

Vibratory Rollers

30
Q

the resistance to movement between particles due to physical bonds from:

-Particle interlocking
-Atoms sharing electrons at surface contact points
-Chemical bonds (cementation) such as crystallized calcium carbonate

A

Shear strength in soils

31
Q

the oldest and simplest form of shear test arrangement

A

Direct Shear Test

32
Q

Common Laboratory tests for Shear Strength

A
  • Direct shear test
  • Triaxial shear test
  • Unconfined compression test

[CE 162] Geotechnical Engineering I (3 decks)

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