A researching efficient, low-impact pile foundation construction technique under ultra-close distance conditions is particularly crucial. This study aims to explore methods for effectively minimizing micro-disturbance effects on adjacent tunnels during the full rotary drilling and bored pile construction process, thereby ensuring both safety and quality. First, we analyze the primary characteristics and challenges of full rotary drilling and bored pile construction under ultra-close conditions, with a specific focus on the potential risks posed to nearby tunnels. Then, based on relevant research findings domestically and internationally, we propose an optimized construction process for controlling micro-disturbances. This includes adjustments to drilling parameters, the application of slurry wall support, and selection and pouring techniques for concrete in bored piles. Results indicate that the ultra-close full rotary drilling and bored pile technology demonstrates high construction efficiency with minimal disturbance to surrounding tunnels, ensuring construction safety. By optimizing drilling parameters and controlling the construction speed, disturbances generated during construction can be effectively minimized. Field monitoring results show that, with the use of full rotary drilling technology, soil displacement around the site remains within permissible limits, causing no exceedance of standard-defined thresholds for the adjacent tunnels. Real-time monitoring during construction is essential for controlling micro-disturbances. By strategically placing monitoring points and utilizing advanced monitoring equipment, it is possible to detect anomalies in the construction process promptly, providing a basis for necessary adjustments.

Haijun Song. Micro-disturbance Construction Technology of Ultra-close Rotary Drilling and Bored Pile. International Journal of Frontiers in Engineering Technology (2024), Vol. 6, Issue 6: 33-40. https://doi.org/10.25236/IJFET.2024.060605.

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