Numerical Study on Mitigating Dynamic Compaction Transient Waves Using Open Trenches and Borehole Barriers

Dynamic compaction in urban areas has great potential to damage nearby structures and their occupants due to induced vibrations. One common approach to keeping these vibrations in a safe range is installing a barrier crossing the wavefronts. Previous studies have largely focused on evaluating the effectiveness of trench barriers in reducing continuous vibrations, while the efficiency of boreholes as an alternative approach with a lower volume of excavation has not been thoroughly investigated. This study uses ABAQUS software to compare the efficiency of borehole and trench barriers in reducing vibrations induced by the dynamic compaction (DC) process using a ۳D model validated by in-field study results. The study uses a row of hollow boreholes with varying diameters, depths, and center-to-center distances located at a fixed location from the tamping point to investigate the efficiency of borehole barriers based on their geometrical parameters. Open trenches with varying lengths, depths, and distances from the tamping point are also used for comparative investigations. The results indicate that the trenches have overall better performance than borehole barriers, However, properly designed boreholes can still reduce vibrations to an acceptable extent. Finally, the study presents design guidelines for further practical applications.

کلیدواژه ها:

Dynamic compaction ، barrier ، Borehole ، Open trench ، PPV ، Vibration