文章通过分析旋挖扩底灌注桩受力原理、适用范围、施工工艺流程、质量控制要点运用试验与验证及经济效益分析方法,研究了旋挖扩底灌注桩的成孔机理和技术特点,进一步验证了旋挖扩底灌注桩比普通等直径灌注桩单桩承载力大、累积沉降量小的特性。 In this paper, through the analysis of the principle of force, the scope of application, the construction process flow, the main points of quality control, the mechanism and technical characteristics of the hole-pouring piles are studied by means of test and verification and economic benefit analysis. The test results show that the capacity of rotary pile foundation piles is larger than that of common equivalent diameter piles and the cumulative settlement is small.