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Engineering Geology > Weathering, soils and the regolith > Flashcards

Weathering, soils and the regolith Flashcards

1
Q

Soil

A

Altered minerals from rocks, organic material

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2
Q

Regolith

A

Soil, broken rock, dust, alluvium

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3
Q

Weathering in warmer climate =

A

salt crystallisation
alteration of clays
laterite formation
thermal expansion

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4
Q

Weathering in colder environments

A

frost shattering

freeze-thaw

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5
Q

Extent of weathering depends on..

A

Time
Porosity/permeability
Climatic conditions

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6
Q

Limestone

A

Strong (20-100 Mpa)

But reactive

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7
Q

Alluvial deposits

A 
Overbank
Meander scrolls
Channel Fills
River Terraces
Tufa
Peat
Lake deposits
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8
Q

Alluvium in construction…

A

Considered soil (SBP values in KPa)

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9
Q

Glacial deposits

A

glaciofluvial deposits

galcial deposits

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10
Q

Rockhead =

A

eroded bedrock landscape beneath regolith

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11
Q

Construction on glacial (hazards)

A

Hazards

  • permeability
  • stability (lenses of clay = slip planes)
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Engineering Geology (3 decks)

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