Principle and application of instrumented pile test

The instrumented piles test are possible to establish the unit skin friction and unit end bearing resistance of every soil layer at each load increment by means of the instrumentation parts such as the vibrating wire strain gauge so as to provide reliable parameters for pile design. The test results are also the precious research materials for the load transfer mechanism, design methods and code revision. However the testing accuracy and effect are not satisfied without the systematic and authority introduction, especially the low survival percentage and abnormal data. In fact, the instrumented pile tests are a systematic project, so instrumentation and taking the readings must be planned, executed, and evaluated by persons who have experience in all the phases.