Geotechnical Engineering Circular No. 9 Design, Analysis, and Testing of Laterally Loaded Deep Foundations that Support Transportation Facilities
Figure 12-6: Piecewise polynomial curve fitting applied to moment profile (after Dunnavant 1986)
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- 12.5 LATERAL LOAD TEST REPORTS
| Figure 12-6: Piecewise polynomial curve fitting applied to moment profile (after Dunnavant 1986). To use this technique, a minimum of five pairs of strain gauges along the shaft are required, and this should be considered when planning the instrumentation requirements. The more pairs of gauges used along the shaft, the greater the accuracy of the fitted curves, and the p-y relationships derived from them. 12.5 LATERAL LOAD TEST REPORTS Lateral load testing programs should be documented in a report. Topics to be addressed in the documentation and reporting of lateral load tests include the following 193 1. Background information on the project – bridge, wall, research program, etc. 2. Objectives of the test program – develop parameters for design, construction stage verification testing, research to investigate a particular aspect of lateral foundation analysis or develop design parameters, etc. 3. Background on the site a. Subsurface conditions – characterization of soil, rock, and groundwater conditions at the test site. b. Information as to why the site was selected, if available. 4. Details of the foundation construction – type, diameter or size, length, strength of materials, reinforcing, and other details as applicable regarding the construction of the foundation elements) that are tested. 5. Test type and detailed description of test setup. a. Include applicable ASTM references and owner specifications note any deviations from standard specifications or approved modifications of testing setup or procedures. b. Description, including details and photographs, of test setup. Include relevant calculations as appropriate for determining adequacy of test apparatus. c. Test procedures. 6. Instrumentation and monitoring details a. Instrumentation layout including the types, number, and locations of instruments. Include drawing details and installation records. b. Data acquisition procedures. c. Instrumentation calibration data. 7. Test results and analyses a. Overall description and discussion of the performance of the test, whether the stated objectives were met or not, any issues or problems that occurred or were observed during the test. b. Numerical data and plots of data obtained from the test. c. Interpretation of test results, as applicable, including description of methods for data reduction and analyses. 8. Limitations of the tests or on the use of the test results and interpretations, as applicable. The reporting of the test results and interpretations maybe done in one comprehensive report by a single party, as maybe the case fora research program, or maybe documented in multiple reports by multiple parties. A construction verification test, for example, maybe documented in terms of the test setup and results by the testing contractor, but the interpretation of the results maybe performed and documented by the design engineer. Often, for large projects with multiple test sites, a separate report maybe prepared for each site to allow work to proceed atone site before all testing is completed. In many cases, the test program will be prepared following specifications fora construction contract, either as part of a standalone contract for the testing or as part of a larger construction contract. Such a specification should require submittals of the proposed test setup for approval prior to construction of the test foundation and test setup. The approved submittals can serve as documentation, with any noted as- built changes, and can be included in the test report. |