Equivalent conversion method for self-balanced tests

The difference between the conventional static loading tests and the self-balanced tests are presented, and an equivalent conversion method is proposed to determine the behaviors of pile based on the results of the self-balanced tests. In this method the data obtained from the field tests are carefully analyzed and the Mindlin solution is used to calculate the additional stress in soil which is produced by shaft resistance. Then the relationship between the shaft resistance and the relative movement between pile and soil, that is, and is determined. Based on the relationship, the method is used to calculate the shaft resistance and the axial force from the pile tip to the pile head are obtained. The <>Q-<>s curve of the conventional static loading tests is determined. The additional stress in the soil induced by the shaft resistance of the upper pile is taken into account. The experience coefficients adopted in the other equivalent conversion methods are not the necessities in this method. The correctness and feasibility of the proposed method are validated by examples. It is easy to be programmed and can be referred and used by the colleagues for further researches.