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FOUNDATION ENGINEERINGFOUNDATION ENGINEERING

Teacher:

János Szendefy, PhD – lecturer

Budapest8 September 2010

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Foundation Engineering

1. Information about the course

Credit point: 42 hours lecture / week 2 hours practice/ each second week 

Test: 45 min. on 27 OctobreDeadline of projects:1 project: 3 November2 project: 8 December

 Admission for the exam:Pass the test,Deliver the projects,Participate the practices 4 times during the semester.

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Foundation Engineering

2. Contents of semester

Function of foundations

Soil exploration

Shallow foundations:•T es•Designing•Settlements•Stability

•Design onto disadvantageous soils

Deep foundations:•Piles•Diphragma walls• y n er an ox ca sson

 •Excavation, retaining structures•Dewatering

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Foundation Engineering

3. Function of foundations, basic conceptsFoundation: A structure elements, which transfer the load

Stress in the soil

Settlements

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Foundation Engineering

3. Function of foundations, basic concepts

Soil layers

a ow oun at on eep oun at on

roun water eve

Neigborhood buildings

Superstructure

Building situations

Special structure element: difficult standardization, built

under the surface, difficult to repair, its effect to thesuperstructure

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Foundation Engineering

4. Soil exploration

 Aim: find out the soil layers on the site and determinet e soi parameters to esign t e most suita e oun ation

Site visiting:

 

Environment of the site

Neighborhood buildings (foundation, cracks)

Flora

Local information

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Foundation Engineering

4. Soil exploration

rect processes :

Test pit

Borehole small or lar e diameter

Indirect processes :

Sounding processes (in-situ testing devices)

Geophysical processes

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Foundation Engineering

4. 1. Direct processes

 

 Advanta es : Disadvanta es :

ReliableUndisturbed sample

Small depthJust above groundwaterEarth retaining

General using: foundation of existing buildings

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Foundation Engineering

4. 1. Direct processes

Small diameter

Small (easy to move)Cheap

sa van ages :Not always applicableSmall diameter

General using: 0-8 m depth, normal soils

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Foundation Engineering

4. 1. Direct processes

Large diameter

 Advantages :Fast (economical in huge project)Large diameterDeth without limit

Disadvantages :More expensiveBig size

Heavy (soil, rock)

General using:8-60 m depth, diameter 100-300 mm

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Foundation Engineering

4. 1. Direct processes

Large diameter

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Foundation Engineering

4. 1. Direct processes

Undisturbed sample

Strength characteristicDeformation charachteristic

Disturbed sample

 Water content

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Foundation Engineering

4. 1. Direct processes

 

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Foundation Engineering

4. 1. Direct processes

 

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Foundation Engineering

Thank you for your attention!