Behavior of Retaining Wall Nearby Machine Foundation in Sandy Soil

Abstract

This study experimentally investigates the frequency-dependent dynamic soil-structure interaction response for a retaining wall resting on sandy soil and a focus on identifying critical behavioral regimes under varying excitation frequencies. Controlled vibration tests were conducted at 10 Hz, 15 Hz, and 20 Hz in order to study the characteristics of vibration velocity, acceleration, displacement amplitude and settlement. The results show that when frequency increases, the response of elastic stability for progressive failure tends to decrease. At 10 Hz, the base exhibited stable elastic behavior and minor deformation.  This meant it was operating safely.  The places where the observations were made suggest that at the frequency of 15 Hz, the lateral dislocation ratio is more than 1.0. So, we conclude that plastic deformation happened. We also see the maximal dynamic response and vibration speed (1.23-4.61 mm/s) and acceleration (1.1-3.8 m/s²).  The system experienced extreme compounded damage and settled nearly -20mm. Cyclic stress concentration and densification of soil also cause a large degree of lateral spreading. The results indicate a critical resonance (15 Hz) beyond which the dynamic instability builds up and design measures should be taken into consideration in terms of resonant amplification and long-term cyclic degradation to secure foundation safety and serviceability on vibrations caused by machines.