Abstract: This study introduces the principle of self-balancing test for the assessment of the lateral capacity of piles. It establishes the loading pattern and the lateral capacity estimation method using a horizontal self-balancing test method. The p-y curve method can objectively reflect the deformation characteristics of the horizontally loaded pile. The corresponding test results are obtained by using the model test of the self-balancing pile and the traditional horizontal static load pile loaded by the self-balancing method and the traditional static load loading, respectively, so as to obtain the relationship between the ultimate soil resistance  p_u on the side of the self-balancing test pile and the buried depth z, the relationship between the displacement y of the two test piles and the buried depth z. To consider the correlation between the displacement of the self-balancing pile test and the traditional pile test, the approximate pile displacement curve y(z) is simplified, and the eigenvalue of the pile displacement is proposed. It is found that the ultimate soil resistance p_u on the pile side in the same soil is basically linearly correlated with the buried depth z, and the eigenvalue of the displacement of the self-balancing test pile and the traditional test pile is converted into the weights of the influencing factors under the interaction between pile and soil, and is converted accordingly. By converting the coefficients, it is possible to perform simplified and accurate calculations of horizontal self-balancing. The results show that the horizontal bearing capacity of the pile foundation calculated by the self-balancing method is similar to the traditional static load test value, indicating that the self-balancing method is effective in determining the lateral capacity.

Key words: Self-Balancing, Model Test, p-y curve, Lateral Capacity of Pile