挤扩支盘桩是近年开发出来并已投入使用的一种新桩型 ,在我国河南、河北、山东等地应用较多 ,并取得了很好的经济效益。本文介绍了挤扩支盘桩的成桩方法和工作原理 ,通过对试验桩桩周土的开挖取样做室内土工试验 ,得出挤扩分支盘挤压应力对桩周土挤密效应所引起的土干密度的变化规律 ,提出了挤密效应综合影响系数的概念和设计时应注意的有关问题 Squeezed and expanded branch pile is developed in recent years and has been put into operation a new pile type, in our country Henan, Hebei, Shandong and other places more applications, and achieved good economic benefits. In this paper, the pile forming method and working principle of squeezed branch branch pile are introduced. Through the indoor geotechnical test on the excavation sample of the test pile branch, the squeezing effect of squeezing branch branch plate is caused by the squeezing effect of the surrounding soil Of the dry soil density changes, put forward the concept of compaction effect comprehensive impact coefficient and design should pay attention to the relevant issues