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Engineering Geology > Lecture Capture Answers > Flashcards

Lecture Capture Answers Flashcards

1
Q

Newly deposited soil only exhibits one of these strengths:

Cohesive,
Frictional,
Tensile.

A

Newly deposited soil only has Frictional Strength

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2
Q

The third grade of weathering of rocks is described as:

Soil,
Completely weathered,
Moderately weathered.

A

The third grade of weathering of rocks is described as moderately weathered

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3
Q

Which of the following should be described under the mass characteristics of soils when following BS5930:2015

Geological Formation,
Bedding,
Colour.

A

Bedding should be described under the mass characteristics when following BS5930:2015

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4
Q

The engineering properties of the ground will usually increase with depth due to:

Confinement,
Age,
Water Content.

A

The engineering properties of the ground will usually increase with depth due to confinement.

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5
Q

The load applied to the ground over the area of a foundation is termed the:

Bearing Pressure,
Behaviour Pressure,
Bowing Pressure.

A

The load applied to the ground over the area of a foundation is termed the Bearing Pressure

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6
Q

A engineering geological ground investigation is always:

Unchanging,
A perfect representation of the ground,
Constantly evolving.

A

A ground investigation model is constantly evolving

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7
Q

In the initial stage of the ground investigation, there should always be:

Intrusive investigation,
Desk Study,
Contamination Testing.

A

In the initial stage of the ground investigation there should always be desk study.

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8
Q

Geophysical surveys rely on:

Contrasts in the ground properties,
Historical Maps,
Airborne Radiation.

A

Geophysical surveys rely on contrasts in the ground properties.

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9
Q

Which of these is not a type of drill rig?

Percussion,
Rotary,
Sledge.

A

Sledge is not a type of drill rig.

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10
Q

The limitations of a trial pit do not include:

Ability to take samples,
Depth,
Spatial Coverage.

A

The limitations of a trial pit do not include the ability to take samples

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11
Q

Which geological property does not affect the strength of rocks?

Grain size,
Colour,
Degree of inter-granular bonding

A

Colour does not affect the strength of rocks

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12
Q

Which is not a mechanical property of rocks?

Elasticity,
Mineralogy,
Strength

A

Mineralogy is not a mechanical property of a rock

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13
Q

Rocks that show different strengths based on the loading orientation are said to be:

Weak,
Heterogeneous,
Anisotropic.

A

Rocks that show different strengths based on the loading orientation are said to be anisotropic.

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14
Q

Young’s Modulus is a measure of?

Elasticity,
Compressibility,
Strength

A

Young’s Modulus is a measure of Elasticity

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15
Q

A very weak rock has a strength of below:

500kPa,
200MPa,
3MPa.

A

A very weak rock has a strength below 3Mpa

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16
Q

Which of the following describes a rock mass?

The mechanical properties are governed by the material and its discontinuities,
Always behaves in plastic manner,
Is always weathered.

A

A rock mass’s mechanical properties are governed by the material and its discontinuities.

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17
Q

Which of these is not a discontinuity?
Gneissic banding,
A bedding plane fracture,
A joint,

A

Gneissic banding is not a discontinuity

18
Q

In the Barton-Bandis model, what does JRC refer to?

Joint Roughness Contact,
Joint Roughness Coefficient,
Joint Rugosity Condition.

A

In the Bartion-Bandis model, JRC refers to Joint Roughness Coefficient.

19
Q

Which of the following is not true of rock joints?

They always show strain hardening,
Shearing can be accommodated through overriding of asperities,
φb is strain independent.

A

Rock joints do not always show strain hardening.

20
Q

Which failure criterion/ constitutive model best describes rock masses?

Mohr-Coulomb,
Barton-Bandis,
Hoek-Brown.

A

Hoek-Brown best describes rock masses

21
Q

A continuum represents a mass that:

is locked in place,
acts like a single body,
is dominated by the properties of a single discontinuity

A

A continuum represent a mass that acts like a single body

22
Q

What is not one of the 3 most relevant material properties to rock slope stability?

Unit mass,
The angle of friction,
the permeability

A

The permeability is not one of the 3 most relevant material properties to rock slope stability.

23
Q

Which angle of discontinuity would make a vertical slope the most unstable?

55 Degrees,
65 Degrees,
45 Degrees.

A

A 55 degree angle of discontinuity would make a vertical slope the most unstable.

24
Q

For a block to slide on a inclined slope, the angle of slope needs to:

be less than the angle of friction at the contact,
be equal to the angle of friction at the contact,
be greater than the angle of friction at the contact.

A

For a block to slide on an inclined slope, the angle of slope needs to be greater than the angle of friction at the contact.

25
Q

Wedge sliding requires:

A single discontinuity,
2 intersecting discontinuities,
3 intersection continuities.

A

Wedge sliding requires 2 intersecting discontinuities

26
Q

The stability of a slope can be expressed by:

A safety scale,
A factor of safety,
A factor of uniformity.

A

The stability of a slope can be expressed by a factor of safety.

27
Q

When the forces promoting failure of a slope are matched equally by the opposite forces opposing failure, this is known as:

Limiting Stress,
Limiting Equilibrium,
Limiting Displacement.

A

When the forces promoting failure of a slope are matched equally by the opposite forces opposing failure, this is known as limiting equilibrium.

28
Q

To assess the stability of a slope using limit equilibrium methods, you must assume:

The slope can only fail along existing discontinuities,
Failure surfaces develop through intact rock,
The slope fails in tension.

A

To assess the stability of a slope using limit equilibrium methods, you must assume the slope can only fail along discontinuities.

29
Q

If a rock slope has a safety factor of >1, this means that the slope is:

Stable,
Unstable,
in a condition of limiting equilibrium

A

If a rock slope has a safety factor of >1, this means that the slope is stable

30
Q

The effect of water pressure in a tension crack has to be resolved into an uplift and thrust force unless:

the tension crack is perpendicular to the potential failure surface,
the tension crack is oblique to the potential failure surface,
the tension crack is parallel to the potential failure surface.

A

The effect of water pressure in a tension crack has to be resolved into an uplift and thrust force unless the tension crack is perpendicular to the potential failure surface.

31
Q

What is not true of landslides?

Movement must be outward and downward,
Movement can be falling, bounding, sliding or flow,
They only happen on the land.

A

Landslides do not only happen on the land.

32
Q

The very top of a landslide is called the:

head,
flank,
crown.

A

The very top of a landslide is called the crown.

33
Q

Which of these 3 flows is not caused by involvement of water?

Sand blow,
Solifluction,
Debris Flows

A

Sand blow is not caused by the involvement of water.

34
Q

An extremely rapid landslide has a velocity of:

> 5m/sec
50m/sec
500mm/sec

A

An extremely rapid landslide has a velocity of >5m/sec.

35
Q

The most common cause of landslides in the UK is:

Poor engineering,
Rainfall,
Earthquakes

A

The most common cause of landslides in the UK is rainfall.

36
Q

Which of these statements is false?

Faults are caused by large earthquakes,
Earthquakes can be shallow or deep focused,
Earthquakes are caused by the elastic rebound of the crust.

A

Faults are not caused by large earthquakes.

37
Q

Which is not a measure of earthquake magnitude?

The Fault Displacement Magnitude Scale,
The Moment Magnitude Scale
The Richter Local Magnitude Scale

A

The Fault Displacement Magnitude Scale is not a measure of earthquake magnitude.

38
Q

What is the most commonly used measure of the ground shaking?

Magnitude,
Peak Ground Acceleration,
Spectral Acceleration.

A

Peak Ground Acceleration is the most commonly used measure of the ground shaking.

39
Q

Liquefaction occurs most commonly in:

Silty Sands,
Clays,
Loose Gravel.

A

Liquefaction occurs most commonly in Silty Sands.

40
Q

The return period of earthquakes are shorter on faults with:

High slip rates,
Low slip rates,
Variable slip rates.

A

The return period of earthquakes are shorter on faults with high slip rates

Engineering Geology (2 decks)

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