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Geotechnical Engineering > Phase Relationships > Flashcards

Phase Relationships Flashcards

1
Q

What is soil defined as?

A

Soil = Liquid + gas + solids

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2
Q

What is the liquid phase in soil primarily composed of?

A

Water

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3
Q

What is the gas phase in soil primarily composed of?

A

Air

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4
Q

What are the solids in soil generally made of?

A

One or several minerals or organic matter

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5
Q

Why are the relative amounts of the phases in soil important?

A

They affect mechanical behaviour

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6
Q

Define bulk/total density in the context of soil.

A

Density of the entire soil mass including solids, liquids, and gases

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7
Q

What does the term ‘unit weight’ refer to?

A

Weight per unit volume of soil

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8
Q

What is the relationship between weight, mass, and gravity?

A

Weight = Mass x Gravity

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9
Q

What does water content (w) indicate in soil?

A

The amount of water present in the soil

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10
Q

What is the degree of saturation (S) in soil?

A

The ratio of the volume of water to the volume of voids

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11
Q

What characterizes partially saturated soil?

A

0 < S < 1

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12
Q

What characterizes saturated soil?

A

S = 1

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13
Q

What characterizes dry soil?

A

S = 0

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14
Q

Define porosity in soil.

A

The ratio of the volume of voids to the total volume of soil

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15
Q

What is void ratio in soil?

A

The ratio of the volume of voids to the volume of solids

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16
Q

What does saturation refer to in the context of soil?

A

The extent to which voids are filled with water

17
Q

What is the triphase nature of soil?

A

A mixed mass of solids, water, and air

18
Q

What is specific gravity in soil mechanics?

A

A dimensionless measure of unit weight or density

19
Q

How is specific gravity of solids represented?

A

Specific gravity = (unit weight of solids) / (unit weight of water)

20
Q

What are the reference values for the unit weight of water?

A

γw = 9.8 kN/m³ and ρw = 1000 kg/m³

21
Q

What is total unit weight in soil?

A

The unit weight of soil considering all solids, water, and air

22
Q

What influences the maximum and minimum densities of soil?

A

Standardized tests

23
Q

What is the dry unit weight (γd) of soil?

A

The unit weight of soil if all water is removed while keeping void volume constant

24
Q

What is saturated density (ρsat) in soil?

A

The density of soil if all voids are filled with water

25
Q

Fill in the blank: The ideal separation of the three phases of soil allows for the determination of _______.

A

relationships between them

26
Q

True or False: Specific gravity varies significantly with temperature and pressure.

A

False

Geotechnical Engineering (1 decks)

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