Liquifaction of soil by liju
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Transcript of Liquifaction of soil by liju
Welcome all.!
SOIL LIQUEFACTION
DEFINITION:STILL GOING ON
‘Liquefaction is a phenomenon where in a mass of soil losses a large percentage of its shear resistance, when subjected to monotonic, cyclic, or shock loading, and flows in a manner resembling a liquid until the shear stresses acting on the mass are as low as the reduced shear resistance .’
Explanation of Liquefaction
Modes of Liquefaction
•Flow Liquefaction•Quasi Liquefaction•Sand Boiling
SAND BOILING• Sand boils can be a mechanism
contributing to liquefaction and levee failure during floods.
• This effect is caused by a difference in pressure on two sides of a levee or dike, most likely during a flood.
• This process can result in internal erosion.
* Sand boils * lateral spreads * Loss of bearing capacity * ground settlement * failure of retaining wall* buoyant rise * ground oscillation* flow failures of slopes
Ground failures caused due to SOIL LIQUEFACTION
ADVERSE EFFECTS OF LIQUEFACTION
FLOW FAILURE
LATERAL SPREADING
GROUND OSCILLATION
EARTH QUAKE INDUCED LIQUEFACTION
DISASTERS DUE TO SOIL LIQUEFACTION
Counter measures against liquefaction
• Densification• Vibrofloatation• Blasting• Stabilization of Soils• Filtration (Drainage)• Lowering of ground water table• Application of dead weight• Mitigation of lateral flow by
providing baffle walls
Safety Precautions• Liquefaction mitigation by
improving the soil properties• > Vibro-Compaction• > Stone Columns• > Dynamic Compaction• > Compaction Grouting
Vibro-Compaction
Dynamic Compaction
Compaction Grouting
CONCLUSION• We studied soil liquefaction in detail with respect to
its importance, properties of soil, details of liquefaction, geotechnical study, evaluation techniques and remedial measures and concluded that liquefaction is very important phenomenon and it has not given that much important in India. The detailed study of liquefaction must be undertaken for Indian earthquake region and preventive measures must be conducted in liquefaction prone area so as to avoid the failure of structures during earthquake, So as to be safe against earthquake failure.