自重湿陷性黄土地基中双向螺旋挤土桩复合地基设计参数的取值

DESIGN PARAMETERS OF SDS-PILE COMPOSITE FOUNDATION IN SELF-WEIGHT COLLAPSIBLE LOESS FOUNDATION

在深厚湿陷性黄土中利用双向螺旋挤土桩成桩过程中的挤土效应,通过调整桩间距,不仅可以消除桩间土的湿陷性,还可以提高复合地基承载力。结合深厚湿陷性黄土上双向螺旋挤土复合地基的原位足尺试验,初步确定该施工工艺在湿陷性黄土地区复合地基应用中的相关参数。

Tests have proved that in the collapsible loess,the use of the squeezing effect of soil displacement screw(SDS)piles in the process of pile formation,by adjusting the pile spacing,could not only eliminate the collapsibility of soil around piles,but also improve foundation bearing capacity.Through the fall scale test in site,the relevant design parameters of SDS-pile composite foundation in self-weight collapsible loess zones were preliminarily determined.