挤扩支盘桩在非饱和土体中的挤密效应探讨

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的挤密效应所引起的土干密度在水平和坚直方向的变化规律，发现最大干密度可提高20％以上，并提出了挤密效应综合影响系数的概念，建议设计时可适当考虑支盘底部土体承载力的提高，并合理选取支盘的间距。

Research on extrusion effect of compaction piles with expanded branches and plates

This paper presents the construction methods and action principle of compaction piles with expanded branches and plates. Through soil tests of samples collected round the pile, the variation rule of the soil dry density due to extrusion effect when extruding branches and plates was obtained. It indicated that the soil dry density had been increased by more than 20%. In addition, this paper presents the concept of extrusion influence factor and some suggestion to be considered in design such as how to determine the bearing capacity of the soil under the branches and the distance between the two near branchs and so on.