• 学报（中文） •

### 静压沉桩引起的土体应力与孔压分布特征

1. 1. 长安大学 建筑工程学院， 西安 710061； 2. 同济大学 地下建筑与工程系， 上海 200092
• 作者简介:张亚国(1984-)，男，甘肃省陇西县人，讲师，主要从事岩土力学和地基基础方面的教学和科研工作. E-mail: zhangyaguo29@163.com.
• 基金资助:
陕西省自然科学基础研究计划(2017JM5025)， 陕西省住房城乡建设科技研发项目(2016-K72)，中央高校基本科研业务费专项基金(310828171002)

### Distribution Characteristics of Stress and Pore Pressure Induced by Pile Jacking

ZHANG Yaguo,LI Jingpei

1. 1. School of Civil Engineering, Chang’an University, Xi’an 710061, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

Abstract: A series of centrifuge model tests were conducted on the spatial distribution characteristics of stress and pore pressure due to pile installation. According to test data, the existing cavity expansion theory was modified, and a pile installation model, which took ground surface heave into account, was proposed. The reliability of this model was validated by the centrifuge test data. The results showed that variation characteristics of total radial stress and the pore-water pressure were controlled by the distance from the pile axis and depth of the soil element. For a certain depth, the stress and pore-water pressure of soil increased as the pile tip reached and decreased as the tip passed. For the same distance from pile, the increases of stress and pore-water pressure caused by deep penetration were larger than those induced by shallow penetration. The reason was that the free ground surface influenced the stress conditions. If the pile penetration depth in the silty clay reaches 7~7.5 times pile diameter, the influences can be ignored. The studies of this paper will provide the basis for time-dependent prediction of pile foundation capacity.