水泥土搅拌桩复合地基桩土应力比的对比分析

在某高速公路试验段的基础上，对不同桩长的水泥土搅拌桩复合地基在载荷试验中和路堤填土期的桩土应力比结果进行分析，探讨了荷载特性对复合地基桩土应力比的影响。结果表明：在刚性荷载和半柔性荷载条件下桩土应力比的变化规律存在着差异，在路堤的半柔性荷载作用下，复合地基的桩土应力比较载荷板刚性荷载下的桩土应力比小，并证明了路堤填土确实存在着拱效应。

Comparison and Analysis of the Pile-soil Stress Ratio in Cement Mixing Pile Composite Foundation

Based on the experimental section of an expressway, this paper analyzes the measurements of the pile-soil stress ratio in composite foundation load tests and during the embankment construction. The effects of load features to the pile-soil stress ratio of composite foundation are also discussed. The study results indicate that the variation of pile-soil stress ratio under rigid load is quite different from that under semi-flexible load, the pile-soil stress ratio of composite foundation is smaller than that of rigid load and also demonstrate that the arch effect really exists in the embankment fillings.