A New Method for Calculating Deformation and Stress during Pile-Anchor (-Strut) Support Foundation Construction

Pile-anchor (-strut) retaining structure is widely used in deep foundation pit, and the elastic foundation beam method is a common method to simulate and analyze the deformation and stress changes in the construction process of this kind of support of foundation pit. However, when applying this method for analysis, it is necessary to first divide a soldier pile into several segments at the braces for each construction stage, and then re-derive the corresponding undetermined parameter equations by using the continuous conditions of displacement and force balance conditions at the junction of the segments, resulting in difficulty to form a unified calculation formula and complication in the analysis method. In order to solve the above problems, by using δ-function to represent the concentrated force of brace on the soldier pile and re-solving the deflection equation of the soldier pile, a unified calculation formula is derived which applies to pit with strutted or anchored retaining structures, arbitrary number braces and case of excavation or brace setting. The new method not only avoids the subdivision of the soldier pile, but also forms a simple and unified calculation method. The numerical results of the method proposed in this article have only slight differences from the segmented method, indicating that the method is feasible.