A Research on the Pile-soil Stress Ratio Range of the Vibroflotation Pile Composite Foundation

The pile-soil stress ratio refers to the ratio between the stress of the pile top and the average stress of the soil among piles. It is an important parameter reflecting the operation status of the composite foundation, as well as a significant index to calculate the bearing capacity and the settlement of the composite foundation. In order to obtain the range of the pile-soil stress ratio of the sand foundation, this paper studies the pile-soil stress ratio based on the data of the static load test for Yulin's project of relocating the airport airfield road. According to the experimental data and the standard formula, this paper makes a back calculation of the ratio (n), and obtains its reasonable range after research, providing a reference for estimating the bearing capacity of the sand foundation. The test proves that the foundation after non-padding vibroflotation treatment has good uniformity, applying to the projects with higher requirements for uneven settlement.