[提要]  通过实践，提出了适应在河流冲积阶地砂卵石地基上的振动冲击沉管灌注全复打嵌扩桩工艺，简要介绍工艺流程及作用原理，对三个工程试桩进行分析，并对单桩承载力进行探讨，推荐其承载力计算公式，供有关设计施工技术人员参考。
[关键词]  砂卵石地基 全复打嵌扩桩 摩擦端承桩 重复挤压  回弹量 残余变形

According to construction experience, this paper introduce the techniques of the vibro-percussion, pipesinking and double-poured piles embedded expansion on the sand-pebble alluvial terrace. Then the technological process and working principles are given. The bearing capacity of a single pile by analyzing three experiment piles on the construction spots are also discussed, and a calculation formula of the bearing capacity is presented for reference.
Keywords: sand-pebble ground; double-poured pile; repeated extruding; friction end-bearing pile