Вплив параметрів динамічного навантаження на деформацію ґрунтової основи

Abstract. Problem.. The study addresses the insufficiently explored aspects of additional settlements in sandy foundation soils under dynamic loads, particularly those following harmonic law vibrations. While static load-induced deformations are well-documented, the long-term effects of cyclic dynamic loading on cohesionless soils remain poorly understood. This knowledge gap is critical for ensuring the stability of vibration-prone structures like turbine units, industrial foundations, and transportation infrastructure, where even minor additional settlements can lead to operational failures or structural damage. Goal. The primary objective is to establish quantitative relationships between the increased deformability of sandy foundation soils and key parameters of forced vibrations, including frequency, amplitude, duration, and loading history. This research aims to develop improved predictive models for dynamic settlement that can be incorporated into modern geotechnical design practices, ultimately enhancing the safety and service life of structures subjected to vibrational loads. Methodology. The comprehensive research methodology combines: Controlled laboratory tray tests using standardized sand samples under precisely calibrated harmonic loads; Field vibro-stamp experiments on natural cohesionless soil deposits to validate laboratory findings under real-world conditions; Advanced analytical methods including multivariate regression analysis and dimensional analysis to derive predictive coefficients. Results. The experimental investigations yielded several significant findings: Dynamic loads induce distinct vibrocreep phenomena in sandy soils, causing progressive settlement accumulation even when static load conditions remain constant; Settlement magnitude demonstrates a power-law dependence on vibration frequency, with critical thresholds observed at 15-25 Hz for medium sands. Originality. This study makes several novel contributions: Development of empirical coefficients specifically tailored for predicting dynamic settlement in cohesionless soils; First comprehensive validation of the relationship between harmonic load parameters and long-term vibrocreep development. Practical value. The research outcomes have direct engineering applications: Enabling more accurate preliminary estimation of foundation settlement for vibration-sensitive structures; Providing a scientific basis for optimizing dynamic load thresholds in geotechnical design codes; Supporting the development of improved vibration mitigation strategies for critical infrastructure; Establishing a framework for condition assessment of existing foundations subjected to long-term dynamic loads