Geotechnical Engineering Circular No. 9 Design, Analysis, and Testing of Laterally Loaded Deep Foundations that Support Transportation Facilities
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| other arrangements should be made to ensure that the construction of the test piles, including instrumentation installation, is properly documented and provide to the Engineer) 1.2.4 Lateral Load Testing Report Submit a Lateral Load Testing Report within 10 days following completion of the lateral load test. The report shall include details regarding the test pile construction including the test pile installation logs, final tip elevation, pile length, description of unusual installation conditions, and testing results (PDA testing for driven piles, CSL testing for drilled shafts, or similar testing as appropriate) The Lateral Load Test Report shall also include details of the test including a description of the test setup, any changes or deviations from the Lateral Load Test Plan and the reasons for such changes, a description of the testing conditions including weather conditions and any nearby activities that may have influenced the test data, records of the test data collected, plots of the test data including plots of the deformation versus load increments, and a discussion of whether the test objectives were met and any relevant observations from the test. (Commentary: If the owner’s Engineer is performing the inspection and data collection of the test, this provision can be deleted from the construction specification) 1.3 Pre-construction meeting The Contractor shall schedule a pre-construction meeting prior to the start of test pile construction to be attended by the owner’s representative, Engineer, Contractor, and specialty contractors, testing firm, and instrumentation specialist, as applicable. The purpose of the meeting will be to review and clarify planned test pile construction procedures, coordinate the construction schedule and activities, delineate responsibilities, and review reporting requirements. At a minimum, the items of review will include excavation attest locations, anticipated subsurface conditions, test pile installation and testing, survey control, geotechnical instrumentation and monitoring requirements, data reduction and analysis procedures, reporting requirements, and schedule of submittals. (Commentary: This pre-construction meeting can be combined with other pre-construction meetings, such as for installation of foundation elements, as appropriate) 2.0 MATERIALS Not Applicable (Commentary: The materials for foundation construction should be covered under the relevant specification for those foundation elements. The materials for the instrumentation should be covered in the Lateral Load Test Installation Plan. There may also bean instrumentation specification section that may cover minimum requirements for instrumentation) 259 3.0 EXECUTION. 3.1 Test piles shall be installed at the locations shown in the Contract Plans unless approved by the Engineer. Test Piles shall be constructed in accordance with the requirements in the Contract Documents and the approved Lateral Load Test Installation Plan. Perform all required inspection and testing and submit applicable records, as specified herein, prior to initiating the lateral load testing. 3.2 The load testing apparatus shall be installed in accordance with the Contract Documents and the approved Lateral Load Testing Plan 3.3 Lateral load test shall be performed in accordance with ASTM D except as modified herein. Load tests shall be performed prior to the start of production pile driving (or construction of production drilled shafts, micropiles, of CFA piles. No piles shall be driven within 200 feet of a pile undergoing lateral load testing. (Commentary: It is possible that there maybe different areas of a project site under construction at the same time. The operations from one area should not disturb testing at another area, hence the restriction on pile driving noted above. Other foundation types, such as drilled shafts, do not produce the same amount of ground disturbance due to vibration. However, the same concept would be applicable, namely that no production elements or other operations that involve ground disturbance, such as installing casing by driving or vibratory hammer, or excavation blasting, be performed within a certain distance or at the same time as the lateral load testing) 3.4 Selected test piles shall be load-tested in conformance with the applicable provisions of ASTM D 3966 including Standard Loading Procedure (Procedure A) and Standard Measuring Procedure, or as otherwise directed by the Engineer. (Commentary: Although Procedure A is typically used, this needs to be assessed for each project) 3.5 The Contractor shall install reference beams) and dial gauges) to measure lateral movement. Dial gauges shall have a precision of one thousandth (0.001) of an inch and shall provide fora travel of three (3) inches. 3.6 Supports for the reference beams) shall be firmly embedded in the ground and at a clear distance of at least seven (7) feet from the test pile. Utilize a transit or other surveying equipment to determine if either the pile or reference beam move during the test. (Commentary: The supports for the reference beams must be a minimum distance away from the test pile to not be influenced by the movement of the ground during the lateral loading. The distance indicated above is based on judgment and should be adjusted as appropriate based on project specific conditions and foundation design) 3.7 Structures for the load test shall be constructed in accordance with Apparatus for Applying Loads and Apparatus for Measuring Movements of ASTM D 3966 and approved Lateral Load Testing Plan. Test arrangement shall be designed so that loads are applied to the pile accurately and without eccentricity by means of certified, electric load cell, calibrated hydraulic jacks, pressure regulating devices and tanks, and hand jacks, so that there will be a constant load maintained under increasing movement. The load cell shall be calibrated to an accuracy of not less than one (1) percent of the total test load and shall be equipped with an approved swivel plate. Design structures and test apparatus to safely carry the test loads. 260 3.8 Protect reference beams, test piles, load cell, swivel plate, jacks, compensators and pressure tanks from the sun. In addition, provide a portable shelter to shield the survey instruments from the sun, wind, and precipitation, and provide necessary lighting and suitable heat to conduct the load testing during the hours of darkness. 3.9 The total test load to each test pile shall be as indicated in the Contract Plans. Loading and unloading sequence will be established by the Engineer. The Contractor shall furnish all labor to regulate the loads. 3.10 The Contractor shall take all optical survey and dial gauge readings of pile movement. (Commentary: If the Engineer or an independent inspection firm working for the owner performs the inspection, then this section should be modified to indicate that the Engineer (or inspection firm) will take all optical survey and dial gauge readings, and that the Contractor shall assist the Engineer (or inspection firm) in taking such readings) 3.11 The jack shall be positioned at the beginning of the test such that the unloading and repositioning of the jack during the test will not be required. 3.12 The testing of the piles shall be performed under lateral load increments per Table XXXX– 1: Download 6.03 Mb. Share with your friends:
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