Need for Ground Improvement - Ground Improvement - Lecture Slides, Slides of Geology

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GROUND IMPROVEMENT

Module I

^

Need for Ground Improvement

^

Different types of problematic soils

^

Emerging trends in ground Improvement

Kandla Port Building after 2001earthquake

Leaning tower of Pisa

Effect of Swelling Expansive Soil

Collapsible soils

Collapse occurs due to saturation, loss of cementation bonds,specific clay structure and areas in some areas in Rajasthan and insome counties abroad this is prevalent.

Slope Failure inSweden

Effects of liquefaction

Effect ofDisturbanceon a QuickClay

Ground Improvement Techniques

for different soil types

Ground improvement

can be done through

various mechanisms  Compaction  Dewatering  Reinforcement  Admixtures or grouting

Reinforcement • This method improves the soil response by interaction between soiland inclusion. •^ The improving period depends on the life of inclusion. •^ In this technique there is no change in the state of soil. • It is a widely used technique as it can be done for many types ofsoils.Admixtures

or

Grouting

• Cementation plays a major role in improving the soil response. •^ Short term/long term improvement techniques are possible. • There is a change in soil state after adopting it.

SNo

Type of soil

Reinforcement

Admixtures

Compaction

Dewatering

Organicsoil 2

Volcanicclay soil 3

Highlyplasticclay 4

Lowlyplasticclay 5

Silty soil 6

Sandysoil 7

Gravel soil^ Soils

for^

which

the

technique

is^ not

applicable

Soils

for^

which

the

technique

is^ applicable

Classification of ground modification

techniques

^

Mechanical modification ^

Hydraulic modification ^

Physical and chemical modification ^

Modification by inclusion and confinement ^

Combination of the above