Recent research has shed light on the vibrations caused by the rotary drilling process used in bored cast-in-place pile construction, a critical aspect of modern infrastructure projects like subway systems. This study, conducted by NIE Peng from the 3rd Engineering Co., Ltd of China Railway 12th Bureau Group, focuses on the impact of these vibrations on existing underground structures, particularly in urban settings where space is at a premium.
The research was anchored in a real-world scenario involving the excavation of a station foundation pit for Jinan Metro Line 4. By utilizing field tests and advanced numerical simulations based on three-dimensional finite element models, the study meticulously analyzed how various factors—such as the distance from the vibration source, burial depth, and the number of piles being constructed simultaneously—affect the vibration response of soil layers and utility pipelines.
NIE Peng emphasized the importance of understanding these dynamics: “The closer the soil and existing power pipe trench are to the vibration source, the greater the vibration effect they receive. This knowledge is crucial for minimizing potential damage to existing structures during construction.” The findings indicate that when the distance from the vibration source exceeds 6 meters, the impact on surrounding soil and infrastructure can be considered negligible. Furthermore, the study revealed that as excavation depth increases, particularly beyond 12 meters, the vibrations on shallow-buried power pipe trenches become inconsequential.
This research has significant implications for the construction industry, especially in urban environments where existing infrastructure is often intertwined with new projects. By understanding the vibration influence law, construction firms can better plan their operations to mitigate risks and enhance safety. The study also highlights the need for strategic planning when multiple piles are constructed in proximity, as closer spacing can lead to increased vibration velocities.
With urbanization continuing to rise, the insights gained from this study could lead to more effective construction practices, ultimately saving time and costs while ensuring the integrity of existing structures. As NIE Peng notes, “With proper management of vibration impacts, we can facilitate smoother construction processes without compromising the safety of existing urban infrastructure.”
The findings are published in ‘Chengshi guidao jiaotong yanjiu’, which translates to ‘Urban Traffic and Transportation Research’, underscoring the relevance of this research in the ongoing development of urban transit systems. For more information on NIE Peng’s work, you can visit lead_author_affiliation. This research not only enhances our understanding of construction dynamics but also sets the stage for future advancements in safe and efficient urban development.
