土工基础

›› 2011, Vol. 25 ›› Issue (3): 30-.

• 工程实录 • 上一篇    下一篇

打入式基桩承载力的时间效应分析

 李 永   

  1. (中铁十八局集团有限公司，天津 300222)
  • 收稿日期:2011-02-23 出版日期:2011-11-15 发布日期:2012-01-13
  • 作者简介:李永，男，1977年生，本科，工程师，主要从事铁路工程项目管理工作。

Time-Dependent Effect of Bearing Performance in Driven Pile

LI  Yong   

  1. (China Railway 18th Bureau Group Co. Ltd., Tianjin 300222, China)
  • Received:2011-02-23 Online:2011-11-15 Published:2012-01-13

摘要： 饱和软土中打入式预制桩承载力的时间效应现象，已经在工程中得到验证。结合实际工程的现场实测静载荷试验资料，对饱和软土中打入式预制桩承载力的时间效应机理进行了分析。结果表明：随着休止时间延长，桩周扰动土的结构强度逐渐恢复，摩阻力逐渐增加，桩的承载力呈现一定的时效性。

关键词: 软土, 桩土相互作用, 时间效应, 极限承载力

Abstract: Time-dependent effect of bearing capacity of driven pile in saturated soft soil has been known in the engineering practice effectively. Combined with in situ load test results, the mechanism of time-dependent effect on bearing capacity of driven pile in saturated soft soil is analyzed． The results showed that the structure strength of the disturbed soil around the pile is regained with the time increasing and the lateral friction of pile is also increased, which shows time-dependent effect.