Presentation on liquefation @ pvkk by raghavendra
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Presentation on liquefation @ pvkk by raghavendra

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Earthquake: the word itself feels disastrous. Though the earthquake has no direct effect on human being, but still it causes a plenty of life and property loss. The reason is earthquake tends to......

Earthquake: the word itself feels disastrous. Though the earthquake has no direct effect on human being, but still it causes a plenty of life and property loss. The reason is earthquake tends to fail the various structures such as buildings, houses, bridges, roads etc. and this failure causes all losses. The following pictures shows some of the failure of structures due to earthquake. But please hold for a minute, in case of the following failed structures, it was possible to prevent the failure…… Because these structures are not failed only due to earthquake but because of failure of soil strata bellow the structure due to the earthquake. And if the soil was improved before construction the failure could be avoided.
This phenomenon of failure of soil strata during earthquake is called as the “Soil Liquefaction”. Liquefaction is responsible for extreme property damage & loss of life due to several variations in failure potential. Still the liquefaction is not given that much importance. In India during Bhuj Earthquake lots of structures are collapsed due to liquefaction itself. And there are many liquefaction prone areas are present in zone IV in India. That’s why liquefaction is very much important.
In this paper, the study of liquefaction is done with respect to its introduction, properties of soil in which the liquefaction may occurs, how exactly the liquefaction takes place, detailed Geotechnical Study of liquefaction which includes how to decide the liquefaction prone area, evaluation of liquefaction potential and the various old and recent remedial measures to avoid the liquefaction, along with software and Artificial Neural Network. So that one can become safe against Liquefaction.

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  • 1. A   Paper Presentation BE SAFE AGAINST  “LIQUEFACTION”                                                                        A MAJOR CAUSE OF STRUCTURAL FAILUR DURING EARTHQUA R. RAGHAVENDRA P.HEMANTH III B.Tech, Civil III B.Tech, Civil yours.raghu113@gmail.comhemanth.perusomula@yahoo.in FROM J.N.T.U College of Engg.,Anantapur. For P.V.K.K TECHNO FEST 2K11
  • 2.  INTRODUCTION DEFINITION GROUND FAILURE RESULTING FROM SOIL LIQUEFACTION EXPLANATION OF LIQUEFACTION MODES OF LIQUEFACTION ANALYSING LIQUEFACTION SUSCEPTIBLE GEOTECHNICAL STUDY ON LIQUEFACTION ANALYSIS OF LIQUEFACTION HOW CAN THE RISK OF DAMAGE DUE TO SOIL LIQUEFACTION BE REDUCED? CONCLUSION REFERENCES
  • 3. INTRODUCTION• What is liquefaction?• Relation with earthquakes• Quick sand?....Castro & Polus
  • 4.  "Liquefaction is a phenomenon where in a mass of soil loses 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."
  • 5. Ground Failure Resulting From SoilLiquefaction:    • Sand boils  • Flow failures of slopes • Lateral spreads • Ground oscillation • Loss of bearing capacity • Buoyant rise • Ground settlement                  • Failure of retaining walls
  • 6. Explanation of liquEfaction
  • 7. CONTACT FORCES IN SOILSOIL BEFORE LIQUEFACTION SOIL AFTER LIQUEFACTION
  • 8. MODES OF LIQUEFACTION FLOW LIQUEFACTION QUASI LIQUEFACTION SAND BOILINGLIQUEFACTION BY ROBERTSON A. FLOW LI QUEFACTI ON B. CYCLI C SO FTENI NG 1) Cyclic liquefaction 2) Cyclic mobility
  • 9. LIQUEFACTION SUSCEPTIBLE
  • 10. ANALYSINGLIQUEFACTION SUSCEPTIBLE There are a number of different ways to evaluate the liquefaction susceptibility of a soil deposit. Here they are organized as follows (adopted from Kramer, 1996).a) Historical criteriab) Geo logical criteriac) Compositional criteriad) State criteria
  • 11. STUDY ON LIQUEFACTION BY GEO TECHNICIANS 1) Flow Liquefaction 2) Limited liquefaction
  • 12. GRAPHS RELATED TOLIQUEFACTION
  • 13. ANALYSIS OF LIQUEFACTIONA. EmpiricAl corrElAtionB. simplifiEd procEdurE (By sEEd And idriss)
  • 14. SIMPLIFIED PROCEDURE MSF= Magnitude of scaling factor Ka = Over burden scaling factor Kc = Correction factor for sloping grouting amax= Peak horizontal acceleration in ground when earth quake came g = Acceleration due to gravity rd =stress reduction coefficient σv o and σ’vo are the total and effective overburden stresses
  • 15. PROGRESS INLIQUEFACTION FINES CONTENT MAGNITUED CORRELATED DURATION WEIGHING FACTORS EFFECTIVE OVERBURDEN STRESS
  • 16. finEs contEnt And plAsticityindEXApplicable for FC > 20% if PI>12% FC > 35% if PI<12%
  • 17. WEIGHTING FACTORS
  • 18.  SAFETY HOUSE FOR LIQUEFACTION
  • 19. Properties
  • 20. CONCLUSION We studied soil Liquefaction in Detail w.r.t. 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 importance in India. The detailed study of liquefaction must be undertaken for Indian earthquake regions and the 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.
  • 21. REFERENCES 1) www.ce.washington.edu 2)what is soil liquefaction - Alisha Kaplan. 3)Soil Liquefaction in Earthquake. - Alan F. Rauch. 4) Soil Mechanics & Foundation Engineering. - B. C. Punmia. 5) Liquefaction potential assessment in Chandigarh city. - R. Dharmaraju & Gayatri Devi. 6)laboratory evaluation of dynamic properties and liquefaction potential of sands - Prof. T. G. Sitharam
  • 22. ?RAGHAVENDRA & HEMANTH