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界于树根桩和墩桩之间的扩底锚桩，因其经济实用，施工简便，具有抗压抗拔双重效应而广泛应用于软土地基的暗浜地基加固、地下构筑物抗浮、房屋纠偏、河岸加固和基坑围护等方面。为探索扩底锚桩在不同工程地质条件下的受力机理和施工工艺。笔者结合工程实践开展试验研究，对扩底锚桩的抗压力和抗拔力的机理、抗压力的抗拔力的估算、不同工程地质条件下的施工工艺、充盈系数的确定等，获得新的认识和判断。
The foundation-enlarged anchor piles between the tree root pile and the pier pile are widely used in the construction of the dark foundation of soft soil foundation, the anti-floating of the underground structure, and the house due to their economical and practical use, simple construction, and dual effects of compressive and anti-pull. Deviation correction, riverbank reinforcement and foundation pit enclosure. In order to explore the stress mechanism and construction technology of the expanded anchor pile under different engineering geological conditions. The author carried out experimental research in combination with engineering practices to obtain new methods for the anti-stress and anti-pulling forces of the anchoring piles for the bottom-end, estimates of the pull-out resistance against pressure, the construction process under different engineering geological conditions, and the determination of the filling factor. Recognition and judgment.