Basic Cone Penetration Test Course 2013

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    Basic Cone PenetrationTest (CPT) Course

    Joselet Jane U. Tumilap

    13th & 14th February 2013

  • www.fugro.comDate 14 February 2013

    TOPICS

    Basic of Cone Penetration Test, CPTWhat is CPTCPT Processing using UNIPLOT

    Copy Test from OperatorsOpening the CPT Raw DataTest DescriptionInsert ClipsOffset ChannelsCPT at ResfusalData PresentationCreating ASCII File

    CPT Data Interpretation

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    Basic of Cone Penetration Test, CPT

    Continuous hydraulic push using

    Rods pushed at a rate of 20mm/sec

    Reading taken every 10mm

    Figure 1-1 Schematic Presentation of a Cone Penetration Test

    Figure 1-3 Fugros electric Piezo-CPT Probe equipped with pressure sensors

    Figure 1-2 20-Tonne truck

    Pore water pressure

    Tip Resistance

    Sleeve Friction Resistance

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    What is CPT

    The Cone Penetration Test (CPT) is a method used to determine:

    Geotechnical engineering properties of soils Delineating soil stratigraphy

    In the CPT, using a 200kN capacity electrical cone at the end of a rod is pushed or penetrated continuously into the ground at a constant rate of 20mm/sec equipped with internal sensor.

    The measurements comprised of:

    Penetration depth Cone resistance / tip resistance (qc), Sleeve friction (fs) Pore pressures, u (CPTU a piezocone test) (Optional) Friction Ratio, Fr (fs / qc) Inclination

    CPT vs the Standard Penetration Test (SPT)

    Continuous Operator Independent Repeatability

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    CPT Processing

    CPT Processing = Correcting / checking the raw CPT data

    Processing using UNIPLOT.

    The processing of CPTs consists of the following steps:

    Copy Test from Operators Opening the CPT Raw Data Test Description Insert Clips Offset Channels CPT at refusal Data Presentation Creating ASCII File

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    Copy Test from Operators

    CPT data from site are saved in folders:

    Processed Raw

    Figure 2-1 Copying the test from operators

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    Opening the CPT Raw Data

    Figure 3-1 .1 Opening the CPT data in UNIPLOT for processing.

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    Figure 3-1.1 UNIPLOT 05.19nl Rev.01 Main Menu

    A B C D E F G H

    A.New Selection CPT filesB.Open Selection ListC.Save CPT FilesD.Manual ProcessingE.ClassificationF. Select a Plot Command FileG.Plot on Screen (Preview)H.Plot on Printer

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    Figure 3-1.2 Opening CPT Raw Data

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    2 3 4

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    Figure 3-1.3 Selecting a command file

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    2

    3

    Select a Plot Command File

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    Figure 3-1.4 Unprocessed CPT Log

    A

    B

    D

    C

    Check for:

    A. qc and fs < 0B. SpikesC. Fr

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    Test Description

    Filling the Test Description Data

    Processor Data versus Operator Data

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    Figure 4-1.1 Test Description in UNIPLOT

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    Figure 4-2.2 Inserting of Coordinates and Elevations

    1

    2

    34

    5

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    Insert Clips

    Figure 5-1.1 During and after inserting the clip

    1

    2(Insert New Clip in CPT By clicking the right mouse button )

    3

    4(End of CPT By clicking the right mouse button)

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    Offset Channels

    Check for:

    qc < 0 fs < 0

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    2Offset (Cone, Sleeve)

    fs

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    CPT in Refusal

    Figure 7-1.1 CPT not in refusal and in refusal

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    Delete Clips

    Figure 7-1.2 Deleting Clips / End Record CPT

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    Data Presentation

    The CPT factual log normally presented in a plate with the measured:

    Cone resistance (qc) Sleeve friction (fs) Pore pressure (u) (Optional) Soil Classification

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    Figure 8-1.1 CPT Log before and after processing

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    Figure 8-1.2 CPT Log with Soil Behavior Classification

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    Figure 8-1.3 CPT Log with Soil Behavior Classification with Derived Soil Parameters

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    Figure 8-1.4 Combined CPT Log

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    Creating ASCII File

    American Standard Code for Information Interchange ASCII

    ASCII File ASCII File of Plate

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    Figure 9-1.1 Creating ASCII file

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    Figure 9-1.1 Creating ASCII file of Plate Data

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    CPT Data Interpretation

    Soil Behavior Classification Bearing Capacity Calculation Liquefaction Analysis (LiquefyPro) Soil Parameter Interpretation

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    Figure 10-1.1 Soil Behavior Type (Roberston 1990)

    Friction Ratio, Fr (%)Gravely SAND 0 0.50SAND 0.50 1.00Fine silty SAND 1.00 1.50Sany SILT / silty SAND 1.50 2.50CLAYS 3.00 9.00

    Soil Behavior Classification

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    CPT Bearing Capacity Calculation

    Valid only in cohesionless soil:

    Bearing Pressure = qc / 40 (Footing of 1.0m width) (Indicative)

    For larger width, check settlement if its 25mm or less

    S = BC x B / 2qc

    Where:

    S - SettlementBC - Bearing CapacityB - Foundation width

    Reminder:

    DONT apply unless you have several meters of sand below footing level with consistent qc.

    Reduce the obtained value by 30% if you want to apply for STRIP of the same width.Use only for 1.0m, 1.50m and up to 3.0m.

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    Figure 11-1.1 Combined CPT logs used for interpretation

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    Liquefaction Analysis using LiquefyPro using CPT Data

    ASCII File Excel File Text Format

    Export to LiquefyPro

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    Derived Soil Design Parameter Based on CPT Data

    Relative Density - Dr Undrained Shear Strength - Cu Over Consolidation Ratio - OCR

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    Figure 12-1 CPT log with derived design parameters

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    Figure 11-1.2 Assigning layer properties

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    Figure 11-1.3 Soil Classification

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    The only way to learn how to process

    CPT is

    PRACTICE.

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    Thank You

    All materials and content contained within this presentation remain the property of Fugro ( Fugro 2013) and may not be copied, reproduced, distributed or displayed without Fugro's express written permission. All third party information featured within the presentation remains the intellectual property of their respective originators.