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Engineering Geology and Planning

Everyone in planning and design of engineering

structures must give Geology serious consideration

Therefore use Geology and Engineering Geology(Geotechnology) as early as possible

- Conceptual Stage

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Engineering Geology considerations:

A major construction project- for example, a housing

development-might require a broad range of geologicmatters.

What do you think are some considerations?

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Some considerations:

- What kind of rocks are present?

1. Are they strong enough to support proposedstructure(s)?

2. Do they fracture easily?

3. Are there structural features within the rocks ?Such as folds, faults, bedding planes that makes therocks properties non-uniform and should be takeninto account?

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4. How porous and permeable are the rocks?5. Over a longer term, are they usually prone to

erosion or weathering?

WHAT ELSE?

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- What is the nature of soils present?

1. What is nature of soils permeability, strength and

stability?2. Are any slopes likely to give way to landslides?

3. Does the construction itself have potential to

trigger slides?

4. How cohesive is the soil? How elastic?

5. Do the soils tend to expand and contract asmoisture content varies?

WHAT ELSE?

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- What about WATER?

1. What quality and quantity of surface water are

available?2. What are the surface runoff patterns?

3. If septic tanks are planned, are soils properties and

topography appropriate for them?

4. Other considerations?

WHAT ELSE?

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Other Possible CATASTROPHIC HAZARDS?

1. Landslides and floods potentially affect many

areas.2. Do sinkholes occur in the area?

3. Has there ever been underground mining in the

area?

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THERE ARE LONG LIST OF GEOLOGIC

CONCERNS

AND IT DOES NOT EXHAUST POSSIBILITIES..!

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IMAGESTell me their stories

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Mistakes canMistakes can

cost livescost lives

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Do you have similar

IMAGES/STORIES to share?

E i i

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Engineering

GeologistsReal geologistsReal geologists

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EngineeringEngineering

Geology has aGeology has a

very differentvery different

literatureliterature

Siteworknotfieldwork

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Topics covered in EngineeringTopics covered in Engineering

Geology InvestigationGeology Investigation

Engineering soil & rock description

Desk studies

Remote sensing Site investigation

Geographical information systems

Hazards and risk assessment Introduction to hydrogeology

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Topics covered in EngineeringTopics covered in Engineering

Geology InvestigationGeology Investigation

Soil and rock slope stability analysis

Earthworks and foundation design

Tunnelling Aggregates

Waste disposal

Others

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On s i t e

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CarboniferousswampsVariscan folding

unconformityAncientseabed

Zoneofinteresttotheengineeringgeologist,i.e.thenaturallandscapeplustheeffectsofhumans

unconformityGranitebatholith24Caledonianfolding

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