In-hole dynamic compaction gravel pile foundation structure for large-area soft soil reinforcement

The utility model provides an in-hole dynamic compaction gravel pile foundation structure for large-area soft soil reinforcement. The in-hole dynamic compaction gravel pile foundation structure comprises gravel piles, a soft soil layer, a bearing platform and a terrace. The gravel piles are uniformly arranged in the soft soil layer, and the terrace and the bearing platform are arranged above the soft soil layer; the gravel pile is composed of a plurality of dynamic compaction layers, the dynamic compaction layers comprise the bottommost first dynamic compaction gravel layer with the vertical rectangular section, the bottom of the first dynamic compaction gravel layer is located on the hard soil layer below the soft soil layer, and the second dynamic compaction gravel layer with the isosceles trapezoid section and expanding upwards and outwards is arranged above the first dynamic compaction gravel layer. And a third dynamic compaction gravel layer with a transverse rectangular section is arranged above the sec