Influence of secant pile construction on the deformation of pile foundations in adjacent high-speed railway bridges

The soil-squeezing effect induced during the construction of secant piles can significantly affect the surrounding strata and existing structures. Managing the deformation caused by secant pile construction is crucial to mitigate adverse effects. While much has been studied on the effects of secant pile construction on surrounding soil, few studies focus specifically on the deformation of high-speed railway bridge foundations in these contexts. This study integrates on-site measurements with numerical analysis. It investigates the deformation effects of secant pile construction on surrounding strata and adjacent highspeed railway bridge foundations. A finite element model was developed. The model was used to validate the feasibility of the calculation method for cylindrical cavity expansion and the equivalent simplification of three secant piles in simulating the soil - squeezing effect during construction. Based on these findings, an additional finite element model was created to assess the deformation of high-speed railway bridge piles resulting from the construction of secant piles. The model's computations considered scenarios involving secant piles constructed on single-side and on double-sides (both symmetrically and asymmetrically) of the bridge pier. This article provides insights into the impact of secant pile construction on adjacent bridge piles and offers recommendations for mitigating deformation.