Combined with an application case of testing the vertical compressive bearing capacity of a bored pile by the self-balanced method,the principle of static load test of single pile by self-balancing method is introduced.The problems encountered in the testing and data analysis and processing according to the specifications are discussed.The determination of self-balancing position is the key to influence the test results.In practical engineering,the number of test piles can be increased,and the equilibrium position of back pile can be adjusted timely according to the test situation of front pile,so as to ensure that the ultimate bearing capacity of pile body can be determined by equivalent conversion method.When equivalent conversion calculation is carried out according to the code,when the total displacement of the upper pile is less than the total displacement of the lower pile,the equivalent calculation cannot be carried out after a certain level of load.The selection of the conversion coefficient of compressive friction resistance has a great impact on the calculation results of the compressive bearing capacity of the pile body,and it should be reasonably valued based on the investigation report and local experience.The different ultimate bearing capacity test values can be given for different conversion coefficients of compressive friction resistance in the engineering practice.
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