Comparisons of two pile load testing methods at heat and power plant in north china

High strain dynamic testing method has been more widely used now.It is important to study the reliability of test results for projects.In this paper,the ultimate bearing capacity of single PHC pile is determined by static loading test and high strain test.There are two different diameters of the six test piles.At first,the six piles are tested with the high strain method.The results are obtained with the GOBLE-CAPWAPC-CASE method.Then the piles are tested with the static vertical load testing and slow maintenance loading method.Comparing the results of the two methods,the bearing capacity of the piles by the high strain dynamic testing method is higher than that of the piles tested by the static loading test.The differences are relative with the testing principles,calculating methods and different affecting factors of the two methods.The idealized pile-soil system and how to set the main parameters of high strain method have great influence on the results.How to use the values should be fully considered in testing.