Chapter 8 static pile load testing and pile dynamic. Grl can perform dynamic load testing on driven piles, drilled shafts, augercast piles, micropiles, helical piles, and other cast in place foundations. It can also be a higher quality alternative to astm d4945 high strain dynamic. With a wide range of testing techniques, allnamics is capable to test any type of pile on its integrity, bearing capacity and stiffness.
The static and dynamic test results matched well helping the client save lot of time and money, since most of the piles could be used in further construction at no additional cost. The testing device features a pressure chamber and reaction mass. Static testing is to improve the quality of software products by finding errors in early stages of the development cycle. This test can be applied to driven steel, driven timber and even concrete piles eg. Pile driving analyzer pda for high strain testing pile. The advantages and disadvantages of dynamic load testing. This procedure measures the static axial compressive pile capacity from pile strain and acceleration. However in some cases there are benefits in using testing for design. The pile driving analyzer pda system is the most widely employed system for dynamic load testing and pile driving monitoring in the world. Dynamic pile testing is conducted in unison with either the wave equation analysis of piles computer program or the case pile wave analysis program. The static load test pile was just 50 feet in total length, but was instrumented at six elevations and included over 2,000 feet of instrumentation. Dynamic load testing using pile driving analyser pda equipment is a highstrain nondestructive load test method which can be performed during or after pile installation using conventional pile driving equipment.
For steel or timber piles, dynamic load testing can be done during. Quality of dynamic measurements together with the software features and the engineering factors affect pile capacity obtained by dynamic testing. The dynamic load procedure is standardized by astm d494500 standard test method for high strain dynamic testing of piles. The modot lrfd bridge design manual indicates that. In order to get the most out of each type of testing, and choose the right tools for a given situation, its crucial to. T he dynamic analysis of pile driving, commonly known as dynamic load testing pda testing, is a quick way to assess the mobilized static bearing capacity, the stresses in steel, the integrity of a pile and the driving energy, given by the pile driver, using a dynamic strain impact. High strain dynamic testing high strain dynamic testing encompasses dynamic pile monitoring and dynamic load testing. Dynamic pile testing james fisher testing services. Utilising the latest wireless technology test equipment we will find a solution to your pile testing requirements. This testing can help you pick up the right pile type that can withstand the strains on the pile during driving and gives cautious if the pile driving reaches its required length thus avoiding unnecessary. Dynamic testing in software is the type of testing where the behavior of the system is analyzed while its working in different environments with different inputs and outputs, its always referred to as the validation part in the software cycle, as its mainly about making sure that the system and different outputs produced through the software cycle are done in. Dynamic pile testing was adopted at one of the longest jetty in gujarat after corelation with static testing on a land pile. Load testing established the capacity of both piles.
Dynamic pile testing with capwap analysis wagstaff piling uses the latest in stress wave analysis techniques to assess the quality of the installed foundation system. Amongst the various techniques offered by our highly experienced team are the three most common pile testing solutions. Static load testing methods are ideal for all pile types, on land or over water, and are accomplished on either production piles or sacrificial trial piles. Pile driving analyzer systems also evaluate shaft integrity, driving stresses, and hammer energy. Static testing and dynamic testing are important testing methods available for developers and testers in software development lifecycle. High strain dynamic load tests, also called pda tests, assess the capacity of several piles in a single day. Static testing and dynamic testing software testing help. Micropiles have small diameters, are built with high strength cement grout. Accuracy of determining pile capacity by dynamic methods. Dynamic load testing for foundation bearing capacity. Static and dynamic load testing of large diameter pipe piles. Dynamic load testing with the aid of pile dynamic analyzer pda is a fast and reliable way to evaluate the bearing capacity of the pile. Frequently applied dynamic loading methods are dynamic load testing dlt and statnamic testing stn. Federation of piling specialists handbook on pile load testing.
In the realm of load testing, an assortment of test methods is available for foundations. Jfts has been offering dynamic pile testing using the simbat technique for many years. The pile driving analyzer pda, in routine use throughout the world, is used in the assessment of all pile types, including both driven and castinsitu piles. Typically up to 10 piles per day can be tested with preliminary results issued upon retrieval of data. For most projects the main purpose of pile testing is either to validate the design before construction andor to check compliance with the specification during construction. Pile driving analysis test pda pile testingwith pictures. For a working test in accordance with ice sperwall 2016 the load is increased in stages and held for a specific time. The static behaviour of the test pile can then be predicted from the resultant dynamic measurements.
The basic purpose of high strain dynamic pile testing is to evaluate pile static capacity and its structural integrity using measurement of both force and velocity. The procedure for this test is also explained in astm standard d494500. It can be used for prefabricated piles, castinplace concrete piles steel piles and wooden piles. Federation of piling specialists testing datasheet no 1. High strain dynamic pile testing or pda pile testing is an alternate pile testing technique which takes less time for test preparation and conducting, compared to the conventional static pile load test. It is gaining wide acceptance in north america and overseas as an alternative to expensive and timeconsuming static loading tests. Static compression and tension load test piles may be instrumented to obtain loadtransfer information i. The method is based on the reproduction of waves in long elastic cylinders. The results of the dynamic pile testing during production pile driving will also be included in the research study. Integrity testing integrity testing is a low cost quality control tool used to detect defects along the pile shaft and is typically carried out on 100% of piles on a project. Trial piles are explicitly developed with the aim of executing load tests and consequently, are commonly loaded to failure. Precontract pile driveability analyses and pile testing programmes including static and or dynamic load testing are often advantageous and allow an economic and safe foundation. Pile capacity testing by high strain dynamic loading methods is widely applied because of its economy and efficiency compared to static load testing methods slt.
These are software testing techniques which the organisation must choose carefully which to implement on the software application. Comparison between dynamic and static pile load testing. Suitable for both castin place and precast piles, the simbat technique was first developed in the 1980s before being further developed by james fisher testing services, and gained in popularity over traditional dynamic testing techniques. Allnamics static, dynamic and rapid pile load testing. Pile driving monitoring consists of using a pda to perform real time evaluation of case method capacity, energy transfer, driving stresses and pile integrity for every blow. Dynamic and static load testing at valley view bridge. Hence dynamic testing is to confirm that the software product works in conformance with the business requirements. However, no discussion on static testing would be complete without an explanation of what its counterpart, dynamic testing means. A low strain compressive stress wave is generated by an impact using handheld hammer either normal or instrumented of weights ranging from 0. The 914mm diameter piles were each fully strain gauged and driven through soft quaternary alluvium to found on dense alluvial sands. In addition the founders of allnamics have been pioneers in the field of pile testing, and have been major contributors to the development of various pile testing methods, especially dynamic and rapid load. As with static load testing, personnel from the foundation testing branch are assigned the responsibility for performing pda on caltrans projects.
Dynamic load testing is a fast, reliable and cost effective method of evaluating foundation bearing capacity. This test method is used to obtain the force and velocity through measured strain and acceleration induced in a pile during the impact of an. Difference between static testing and dynamic testing. Ndt services ltd employs the recognised and proven simbat system of pile dynamic testing. Static load tests provide the most reliable results, and the analysis is straightforward. Static and dynamic loading testing were performed on two identical open ended steel pipe piles installed to depths of 80m in shanghai, china. The compression capacity of specialty piles, such as helical piles and micropiles, may be evaluated by high strain dynamic foundation testing methods. Dynamic load testing involves combining field measurements. The technique is a dynamic pile test that allows the prediction of static load settlement behaviour of bored, castinplace and precast driven piles. All of this is available for a f r action of the cost and time required for conventional static load testing. This testing is also called as nonexecution technique or verification testing. Pile testing and analysis dynamic load testing, pile. Foundation monitoring pile driving analyser testing. Static load testing of piles introduction the piling work on this site may require one or more pile maintained load tests.
Dynamic load testing or dynamic loading is a method to assess a piles bearing capacity by applying a dynamic load to the pile head a falling mass while recording acceleration and strain on the pile head. Simbat dynamic pile test system james fisher testing. Testing datasheet no 1 guidance for the principal contractor it is an essential requirement that the specialist testing contractor is allowed to work in a safe way and fully in accordance with their own procedures. Simbat is widely regarded as the most accurate high strain dynamic pile testing method available. Static pile load testing throughout the uk with ndt. The contractor shall perform dynamic pile testing at the locations and frequency required in accordance with section 4. This document is available to the public through the national technical information service, springfield.
Dynamic testing is when you are working with the actual system not some artifact or model that represents the system, providing an input, receiving output and. Ndt can provide both compression and tension pile load testing using a specialist designed system in accordance with the current i. Static pile load testing is an onsite, physical method of determining the axial capacity of a pile. Under normal circumstances, dynamic analysis is used in conjunction with static load testing to determine the adequacy of foundation piles. The ton static load tests included 12 to 15 embedded strain gages to evaluate the load transfer along the length of the piles. Static pile load testing and pile dynamic analysis pile. Pile driving analysis is a powerful tool to control the pile driving process. Dynamic testing methods provide an accurate and nondestructive capacity estimate on production foundation elements much faster and less expensive than static testing methods with comparable results enables more economic pile length design higher confidence level in pile capacity more accurate evaluation of pile set up in given soil. Dlt is considerably faster than static tests and at a fraction of the cost. Dynamic testing in software testing software testing class. Dynamic load test wave analysis software dltwave is used to analyze the field data interpreting the dynamic wave and converting it into the required pile capacity. The static and the dynamic pile testing methods are the two main types of pile tests that are periodically used to assess the pile load capacity. A test that measures the static load bearing capacity of piles, we are also able to provide static load testing for compression and tension piles.
Dynamic load testing dlt is a quick method to evaluate the bearing capacity of a pile for loads similar to the design load. Static pile load testing, sometimes coupled with pile dynamic analysis pda, is critical to design decisions and project planning. Dynamic pile testing the dynamic loading test method allows a large number of piles to be tested in record time and at an extraordinarily low cost, which greatly improves the reliability of the data, unlike static tests alone. Low strain dynamic pile testing pile integrity testing pit astm d5882 it is a quick nondestructive test to check the integrity of pile shaft. Key words lrfd, driven piles setup, wireless dynamic piles testing 18.