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    Pile Testing

    Uploaded by

    Foyjur Razzak Joney
    This document discusses various methods for testing piles, including static load tests, Statnamic load tests, Osterberg cell tests, and Pile Dynamic Analyzer (PDA) tests. It provides details on test setup, instrumentation, interpreting test results, determining failure loads, and accounting for residual stresses in driven piles. The purpose of pile load testing is to evaluate pile capacity and load-settlement behavior to confirm design assumptions prior to construction.

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    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd

    Pile Testing

    Uploaded by

    Foyjur Razzak Joney
    743 views32 pages
    This document discusses various methods for testing piles, including static load tests, Statnamic load tests, Osterberg cell tests, and Pile Dynamic Analyzer (PDA) tests. It provides details on test setup, instrumentation, interpreting test results, determining failure loads, and accounting for residual stresses in driven piles. The purpose of pile load testing is to evaluate pile capacity and load-settlement behavior to confirm design assumptions prior to construction.

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    This document discusses various methods for testing piles, including static load tests, Statnamic load tests, Osterberg cell tests, and Pile Dynamic Analyzer (PDA) tests. It provides details on test setup, instrumentation, interpreting test results, determining failure loads, and accounting for residual stresses in driven piles. The purpose of pile load testing is to evaluate pile capacity and load-settlement behavior to confirm design assumptions prior to construction.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    743 views32 pages

    Pile Testing

    Uploaded by

    Foyjur Razzak Joney
    This document discusses various methods for testing piles, including static load tests, Statnamic load tests, Osterberg cell tests, and Pile Dynamic Analyzer (PDA) tests. It provides details on test setup, instrumentation, interpreting test results, determining failure loads, and accounting for residual stresses in driven piles. The purpose of pile load testing is to evaluate pile capacity and load-settlement behavior to confirm design assumptions prior to construction.

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    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
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    You are on page 1of 32

    Pile Load Test

    What is it? Why? How is it done? How many piles? Which piles? When to conduct the test? What is the maximum test load? How to interpret test results?

    Which test method should we adopt?

    Pile Testing

    Static Load Test - Test Setup


    Reaction Beam Load Cell Stiffeners Plate Spherical Bearing

    Ram
    Hydraulic Jack Bourdon Gage Dial Gage

    LVDT Mirror

    Bracket Attached to Pile Wire Scale Test Pile Grade

    Kentledge Reaction System

    Pile Testing

    Anchored Piles Reaction System

    Methods of Static Load Test

    Pile Testing

    Pile Testing

    Results of a Maintained Load Test

    Osterberg Load Test Concept


    Conventional Q Osterberg Cell

    Qs

    Qs Qo
    Expanding O-Cell

    Qt

    Qo Qt
    10

    Pile Testing

    The Osterberg Cell

    11

    Bored Pile
    Dimaeter = 3 m Length =67m

    Max. Load = 279,000 kN 27,900 t


    12

    Pile Testing

    The Osterberg Cell

    13

    14

    Pile Testing

    The Osterberg Cell

    15

    Pile Dynamic Analyzer (PDA Tests)

    16

    Pile Testing

    Pile Dynamic Analyzer (PDA Tests)

    17

    Statnamic Load Test Setup


    Concrete or Steel Reaction Mass
    Pressure Chamber Load Cell Base Plate Grouted to Foundation

    Loose Granular Fill Propellant Launching Cylinder Piston Base Displacement Measuring Means

    Pile or Drilled Shaft

    18

    Pile Testing

    19

    20

    Pile Testing

    21

    Comparison of Test Duration

    22

    Pile Testing

    Comparisons between Static, Statnamic and Dynamic Pile Load Tests

    23

    When should the pile load test be conducted?

    Clay Pile Type

    Sand Driven Piles & Bored Piles

    Rock

    Method of Testing

    PDA, Statnamic, O-Cell, Static


    24

    Pile Testing

    Field Data on Friction Pile Capacity in Clay


    (after Vesic, 1977)

    25

    Number of piles to be tested?

    26

    Pile Testing

    BCA/IES/ACES Advisory Note 1/03

    27

    What is the maximum test load?


    Working Load Test Qmax = 2 QALL Qmax = 2.5 or 3 QALL
    QULT Q

    Preliminary or Ultimate Load Test


    QALL 2QALL 3QALL

    28

    Pile Testing

    Interpretation of Failure Load

    29

    Forms of Load-Settlement Curves


    (Tomlinson, 1987)

    Friction pile in soft clay

    Friction pile in stiff clay

    Pile end bearing on weak porous rock

    30

    Pile Testing

    Forms of Load-Settlement Curves


    (Tomlinson, 1987)

    31

    Proper Scaling of Load-Displacement Diagram


    What are the failure loads of these two tests?

    Proper Scaling

    32

    Pile Testing

    Determination of Qult
    (after De Beer, 1967)

    33

    Determination of Qult
    (after Mazurkiewics, 1974)

    34

    Pile Testing

    Determination of Qult
    (after Van Der Veen, 1953)

    35

    Brinch Hansens 90% Criterion

    36

    Pile Testing

    Brinch Hansens 80% Criterion

    Qu 0.8Qu

    0.25 u

    37

    Hirany & Kulhawys Method for Bored Piles


    (Hirany and Kulhawy, 1989)

    38

    Pile Testing

    Hirany & Kulhawys Method for Bored Piles


    (Hirany and Kulhawy, 1989)

    39

    Tangent Intersect Method

    40

    Pile Testing

    Tangent Intersect Method (Fuller & Hay, 1970; Butter & Hay, 1977)

    41

    Davissons Method (1973)

    42

    Pile Testing

    10% Rule

    43

    Qu

    Chins Method
    (Chin, 1970)

    m = 1/Qu

    44

    Pile Testing

    Pile Load Test


    (after Chin, 1970)

    Qs = 1 / a1 Qs + Qp = 1 / a2 = Qult

    45

    Ultimate Skin Friction and End Bearing by Chins Method

    46

    Pile Testing

    Comparison of Interpretation Methods


    (Sharma et al, 1984)

    47

    Chins Stability Plot


    (after Chin, 1985)

    48

    Pile Testing

    Chins Stability Plot (after Chin, 1985)

    49

    Chins Stability Plot


    (after Chin, 1985)

    50

    Pile Testing

    Chins Stability Plot


    (after Chin, 1985)

    51

    Pile Instrumentation

    52

    Pile Testing

    Static Load Test on Pile with Telltales


    Q1+Q2+Q3, etc. Q1+Q2+Q3 Q1+Q2 Q1 Load (Q)

    Telltale B Telltale A Telltale A


    Movement

    Pile Head

    Telltale B

    53

    Load Test of Bored Pile in Old Alluvium


    (Chin et al, 1985)

    54

    Pile Testing

    Load Test of Bored Pile in Old Alluvium


    (Chin et al, 1985)

    55

    Load Test of Bored Pile in Jurong Formation


    (Chang & Goh, 1988)

    56

    Pile Testing

    Load Test of Bored Pile in Old Alluvium (Chin et al, 1985)

    57

    Load Test of Bored Pile in Old Alluvium (Chin et al, 1985)

    58

    Pile Testing

    Load Test of Bored Pile in Reclaimed Land


    (Wong et al, 1996)

    59

    Load Test of Bored Pile in Reclaimed Land


    (Wong et al, 1996)

    60

    Pile Testing

    Residual Stresses in Driven Piles

    61

    Correction for Residual Stress in Driven Piles


    (Altaee et al, 1992)

    (-ve)

    (+ve)

    (+ve)

    62

    Pile Testing

    Correction for Residual Stress in Driven Piles


    (Fellenius, 1989; Altaee et al, 1992)

    63

    Correction for Residual Stress in Driven Piles


    (Fellenius, 1989; Altaee et al, 1992)

    Before correction

    After correction
    64

    Pile Testing

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