高压旋喷桩复合地基具有施工工艺简便、适应土体类型能力强及地基处理效果好等优势。研究高压旋喷桩复合地基承载力特点时，必须考虑桩土应力比的变化情况。本文在研究高压旋喷桩复合地基荷载传递特性基础上，以某多层住宅项目6号楼地基处理工程为背景，通过现场钻芯取样和低应变检测获取数据，经数值模拟得到高压旋喷桩复合地基的基桩桩顶竖向应力变化曲线、桩间土竖向应力变化曲线及基桩和桩间土应力比变化曲线，从而分析桩土应力变化特性。

The high-pressure jet grouting pile composite foundation has the advantages of simple construction technology, strong adaptability to soil types and good foundation treatment effect. In the research of bearing capacity of high-pressure jet grouting pile composite foundation, the variation of pile-soil stress ratio should be considered. Based on the study of load transfer characteristics of high-pressure jet grouting pile composite foundation, the original data are obtained through core drilling and low-strain testing in the foundation treatment project of a multi-story residential building. The vertical stress curve of pile top, the vertical stress curve of soil between piles and the stress ratio curve of pile and soil between piles are obtained by numerical simulation, so as to analyze the pile-soil stress change characteristic.

TU473.1