大直径盾构推进引起的桩基侧向位移分析
Analysis of lateral displacement of pile foundation caused by large-diameter shield propulsion
陈威 1王法鑫 2蒙邹蕾 2姚森 3王翀霄 2孙阳2
作者信息
- 1. 中国电建集团华东勘测设计研究院有限公司,浙江杭州 311100
- 2. 河海大学港口海岸与近海工程学院,江苏南京 210024
- 3. 中铁大桥局集团有限公司,湖北武汉 430050
- 折叠
摘要
基于Mindlin弹性解,考虑盾构附加推力及不均分布的盾壳摩擦力的作用,并结合Kerr地基模型,得到了深埋盾构施工引起的桩基侧向位移解答.分析了附加推力大小、切口距离、盾构外径对桩体位移的影响,并将盾构施工不同阶段下的桩基侧向位移数值解与理论解进行对比,表明该方法基本能够反映盾构施工引起的桩基侧向位移变化规律.分析结果显示:推导的理论计算方法得到的桩体侧向位移与数值解的吻合度较高;由于盾构埋深较大,桩体上部侧向变形受盾构附加推力和盾壳摩擦的影响较小,桩体的上部变形远小于下部变形;采用较小的盾构推力能更好地控制桩端位移,采用较小的盾构外径则能更好地控制桩顶位移.
Abstract
Based on the Mindlin elastic solution,considering the additional thrust of the shield and the une-venly distributed shield shell friction,combined with the Kerr foundation model,the lateral displacement solution of the pile foundation caused by the construction of the deeply buried shield was obtained.The effects of additional thrust size,incision distance and shield outer diameter on pile displacement were ana-lyzed,the theoretical solution and numerical solution of pile foundation at different stages of shield con-struction were compared,and the method could basically reflect the variation law of lateral displacement of pile foundation caused by shield construction.The analysis results show that the lateral displacement of the pile calculated by the derived theoretical calculation method has a high degree of agreement with the nu-merical solution.Due to the large burial depth of the shield,the lateral deformation of the upper part of the pile body is less affected by the additional thrust of the shield and the friction of the shield shell,and the upper deformation of the pile body is much smaller than the lower deformation.The use of smaller shield thrust can better control pile end displacement,and the use of smaller shield outer diameter can better con-trol pile top displacement.
关键词
盾构开挖/桩基变形/侧向位移/Kerr地基模型Key words
Shield excavation/Deformation of pile foundation/Lateral displacement/Kerr foundation model引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据