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Foundation Settlement

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Flavia Fernandes

on 22 April 2015

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Transcript of Foundation Settlement

Foundation Settlement
The foundation is dependent upon the soil that surrounds it to hold the foundation in place. In theory this relationship should stand the test of time, however, the one variable that cannot be controlled is that the soil beneath and around the foundation is constantly changing.
Settlement is the downward movement of a building (or building components) to a point below its original position.

• Spreads the load into a larger area at a uniform rate

• Transfers the nonuniform load of the superstructure evenly to the sub soil

• Provides stability against undermining, souring flood water and burrowing animals

• Provides safety against sliding

• Provides a level surface for the construction of the superstructure.

Theory - Symptoms & Solutions
Theory - Settlement Causes
A foundation is an underground structure (directly in contact with soil) that:
There are three
types of settlement
Weak Bearing Soils
Poor Compaction
Changes in Moisture Content
Maturing Trees and Vegetation
Soil Consolidation
Push Pier x Helical Pier
Settlement is always going to occur
Study the soil prior to construction
Compact the soil
Make sure inspections are done correctly
Case Study #1: Residential Foundation Failure
Case Study #2 : Lotus Riverside, Shanghai
Case Study #3:
The complex:
11 buildings
13 stories each
Built by Shanghai Zhongxin Construction Co.
Adjacent to Dianpu River
Constructed on hollow concrete footings
What Happened?
Building construction
4.5 m pit dug out on South side
10 m of soil piled on North side
300 tons of lateral force
10 cm shift
Fractured footings
Building collapse

Engineering failure or
construction failure?

Weak footings
Weak soil
Rainy season
Poor planning
“In 2006, the average longevity of a residential building in China was only 30 years.” - deputy minister of State construction Liu Zhifeng
Lessons learned
Quality inspections
Quality control
Building codes

Transcona Grain Elevator
North Transcona, 7 miles northeast of Winnipeg, Canada;
Construction ended: September, 1913;
Settlement started: October, 1913;
The work-house(16 story) rested on a raft foundation with base located 3.66 m below the ground surface;
The binhouse(10 story) had 5 rows of 13 bins and was constructed on a reinforced-concrete raft foundation and had the base placed also at a depth of 3.66 m.

• Settlement and your concerns

• Uniform settlement –

• Tilting settlement – CASE STUDY 2 AND 3

• Diferential settlement – CASE STUDY 1
Full transcript