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Civil Engineering Construction Chapter 3
Pile Test Dr Mohamad Syazli Fathi Department of Civil Engineering UTM RAZAK School of Engineering & Advanced Technology UTM International Campus
June 24, 2012
Pile Test • Pile testing is the main part of QC/QA for piling works. • Pile load tests are the part of pile testing. • Purposes of pile tests: capacity, settlement & structural integrity. g y • Acceptable limits? Basis?
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Load Test
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Pile Testing-STATIC LOAD TEST
Info required: 11. method statement, statement pile type, type size & length, length 2. installation records, maximum test load, test standard, loading system, 3. settlement measurement methods, drawing & photos 4. showing pile test layout details, calibration certificates & results, etc. 5. All equipment for measuring load and settlement shall be calibrated as specified. 6. At least 2 independent methods to measure settlement. 7. Load cell shall also be included, if specified.
Pile Testing-STATIC LOAD TEST
• Planning: –T Testt piles il shall h ll be b att locations l ti off representative t ti subsoil b il & installation conditions. For each geotechnically typical zone and installation characteristics or each pile – type/size, at least one SLT shall be carried out.
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Pile Testing-STATIC LOAD TEST
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Pile Testing-DYNAMIC LOAD TEST
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Pile dynamic test is used to assess the load bearing capacity of the pile. pile This test uses a hammer of a couple of tons to drop on the pile. Displacements are measured using a high tech instrument. This data is processed to arrive at the pile dynamic load bearing capacity as per standard. This test is easy to conduct and requires very few site arrangements. As a supplement to or replacement for static tests, dynamic testing takes far less time to perform and thus reduces the costs.
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Source: http://www.aaryans.in/pile_dynamic_test.html
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http://www.aaryans.in/pile_dynamic_test.html
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Anchored Static Axial Compressive Load Test
• The main purpose of the compression loading test is to demonstrate construction method and to confirm the design assumptions and the bored pile loading capacity. • This test is also show the actual safety factor applied for the piles. Source: http://www.geonusa.com/AnchorLT.htm
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Pile Lateral Loading Test
• The main purpose of the lateral loading test is to confirm the design assumptions and the bored pile load capacity. • This test is also show the actual safety factor applied for the piles.
Source: http://www.geonusa.com/LateralLT.htm
Load Test
Screwpile
Source: http://www.gkmconsultants.com/applications/img/Pile_Testing_Poster1.JPG
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Automated Static Load Tests
• The monitoring and quality of Static Load Tests has been significantly enhanced in terms of safety, reliability and accuracy of the results by the automation of: – Measurement and recording of pile settlement and applied loading – Control of the applied load – Controlled change of load subject to preset criteria •
http://www.loadtest.com/loadtest-uk/products/static/2006/02/completely_automated_static_lo.php
• Each system consists of load and displacement sensors, a microprocessor based data logger/controller, and a hydraulically operated device for application of load. • The equipment is capable of measuring and recording the load automatically during a test at pre-set intervals of typically 1 minute, to a resolution of 1 kN and pile deflection to 0.01mm respectively.
Automated Static Load Tests
Pictures Source: http://www.chuanluck.com/html/services.htm
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Automated Static Load Tests
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The system automatically checks for continued safe operation every 2.5 seconds, making any appropriate corrections to the hydraulic pressure in the jack to maintain the load to within very tight tolerances. The equipment is powered by a rechargeable battery and is designed to be easily transportable. A computer can be used to monitor the load and deflection rate for immediate analysis, either locally or remotely, without interrupting the test. The data may be presented on screen in tabular and graphical forms and printed results can be readily obtained, making reporting easy and fast. Over 3000 computer controlled loads tests have been carried out with this patented system. The testing service can be provided with or without a clients reaction system to perform, monitor and control a completely automated tension or compresion test under kentledge or reaction beam.
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