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Practice Record of the Zhaotong Project: Pursuing Dreams and Moving Forward in Dynamic Compaction Construction Practice

23 Oct,2025

I have been stationed at the Zhaotong Project for over half a year, and the project has moved from the preparation phase to the final settlement stage. Looking back on this period, I have gone from ignorance when I first arrived at the construction site to gradually gaining a basic understanding of foundation treatment work. Every step of my growth is not only due to the tempering of practice but also thanks to the careful guidance of leaders and masters. This experience centered on intra-hole dynamic compaction gravel piles and CFG piles has enabled me to deeply integrate textbook theories with on-site operations and gain a profound understanding of the rigor and responsibility of the dynamic compaction industry.

When I first came into contact with intra-hole dynamic compaction gravel piles, I was attracted by their unique technology. After hole formation, a heavy hammer is used for dynamic compaction to compact the gravel into a high-strength pile body. Under the leadership of the project manager, I mastered the process of "drilling - layered gravel filling - repeated tamping" and was well aware of the key role of controlling the rammer's drop distance and tamping energy. Once, uneven gravel filling caused the rammer to get stuck in the hole, but the master calmly resolved the emergency, making me realize that we must remain vigilant at all times and prepare contingency plans on the construction site.

In contrast, the construction process of CFG piles is more complex and has higher technical requirements. The construction site adopted the method of pilot hole drilling with a rotary drilling rig and hole formation with a long spiral drilling rig, followed by concrete pouring. I learned the key points of drilling rig operation and assisted in testing the concrete slump to control quality. The control of conduit embedding depth is crucial during pouring—too shallow may lead to pile breaking, while too deep affects efficiency. A case where excessive lifting speed of the conduit caused slurry return made me intuitively understand that "details determine success or failure".

In my work, I not only participated in on-site construction but also took charge of data organization, accurately filing the construction data of the two pile types every day. By analyzing the records, I summarized: intra-hole dynamic compaction gravel piles have high efficiency but strict requirements on geological conditions; CFG piles have a wide application range and high strength but are characterized by long construction periods and high costs. The project manager taught me that the selection of pile types requires scientific decision-making based on comprehensive consideration of factors such as geology, load, and construction period.

This experience made me truly feel the gap between theory and practice—only through hands-on experience on the construction site can one master the essence of the technology. At the same time, I also witnessed the team's dedication to sticking to their posts and controlling each process regardless of the sweltering heat.

Now that the project is about to conclude, I have proficiently mastered the key construction technologies of the two pile types and developed a rigorous and meticulous work attitude as well as a sense of teamwork. This experience will become a valuable asset in my career. In the future, I will take this as a starting point to continuously improve my professional capabilities and strive to grow into a qualified engineering and technical personnel.

Zhang Bin

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Practice Record of the Zhaotong Project: Pursuing Dreams and Moving Forward in Dynamic Compaction Construction Practice
Practice Record of the Zhaotong Project: Pursuing Dreams and Moving Forward in Dynamic Compaction Construction Practice
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