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Parameter for pile design
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Parameter for pile design

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    Parameter for pile design Parameter for pile design Presentation Transcript

    •  
    • PARAMETERS FOR PILE DESIGN Muhammad Shakeel Ahmad 2007- MS- GEO -13
    • WHAT IS A PILE ?
      • PILES ARE STRUCTURAL MEMBERS THAT ARE MADE OF STEEL, CONCRETE OR TIMBER, AND ARE USED TO TRANSMITT THE LOAD OF SUPER-SRUCTURE TO THE SOIL SAFELY.
    • CONDITIONS WHERE PILES ARE REQUIRED ?
      • WHEN THE UPPER SOIL LAYER IS HIGHLY COMPRESSIBLE AND TOO WEAK.
      • FOR STRUCTURES SUBJECTED TO HIGH WIND/ EARTHQUAKE LOADS.
      • IN CASE OF SWELLLING AND COLLAPSIBLE SOILS.
      • TRANSMISSION TOWERS , OFFSHORE PLATFORM AND BASEMENT MATS BELOW WATER TABLE.
      • LOSS OF BEARING CAPCITY IN CASE OF SHALLOW FOUNDATIONS DUE TO EROSION OF SOIL.
      • Types of Piles Based Upon Method of Construction:
      • Bored Piles
      • Driven Piles
      • DESIGN OF A BORED PILE BY STATIC METHOD :
      • Q U = Q S + Q B
      • WHERE
      • Q U = ULTIMATE BEARING CAPACITY OF PILE
      • Q S = BEARING CAPACITY OF A PILE DUE TO SKIN FRICTION
      • Q B = BEARING CAPACITY OF A PILE DUE TO END BEARING
      • BEARING CAPACITY EQUATION FOR SKIN FRICTION (Qs):
      • Qs  D (  CL+KP TAN  L)
      • Where
      • Qs = Bearing Capacity Due to Skin Friction
      • D = Dia of Pile
      • L = length of pile
      •  Angle of Internal Friction
      •  Adhesion Factor
      • C = Cohesion of Soil
      • = Coefficient of adhesive friction
      • P = Pressure
      • BEARING CAPACITY EQUATION FOR END BEARING (Q p):
      • Q p  D 2 Nq P
      • Where
      • Qp = Bearing Capacity Due to End Bearing
      • D = Dia of Pile
      • Nq = Bearing capacity Factor
      • P = Pressure
    • EXTRACTION OF PARAMETERS
      • :
      • For C & 
      • LABORATORY TESTS:
      • 1) Unconfined Compression Test:
      • Used to find C
      • 2) Direct Shear Test:
      • Used to find 
      • 3) Triaxial Test:
      • Used to find C & 
      • FIELD TESTS:
      • Cone penetration Test (CPT):
      • Used to find C & 
      • 2) Standard penetration test (SPT):
      • Used to find C & 
      • But before drawing this graph we should know, how to find N corrected
      • N corrected = C N N        
      • C N =Adjustment for effective overburden pressure = (95.76/Po’) 0.5
      • N = Field No. of blows
      • Po’ = Overburden Pressure
      •   = Er / Erb = Er / 70 =55/70
      •   = Rod length correction
      •   = Sampler correction
      •   = Bore hole dia Correction
    • TABLE TO FIND N corrected
    • SPT PROFILE
    • SPT PROFILE WITH FACTORS
    • TABLE TO FIND 
    • TABLE TO FIND “C”
    • GRAPH TO FIND 
    • GRAPH TO FIND N q
    • DIAGRAM TO FIND PRESSUR (P)
    • Conclusions
      • Hence after finding these factors the Ultimate bearing capacity can be found as:
      • Q U = Q S + Q B
      • Q U  D (  CL+KP TAN  L) +  D 2 Nq P
      • Q all = Q u / FOS
      • FOS = 2.5 – 4.0
      • THANKS
      • ANY QUESTIONS