Study of time effect on vertical bearing capacity of open-ended pipe pile

LIU Jun-wei; ZHANG Ming-yi; KOU Hai-lei

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Study of time effect on vertical bearing capacity of open-ended pipe pile

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- Study of time effect on vertical bearing capacity of open-ended pipe pile
- Vol. 33, Issue S1, (2012)
- 作者机构：
  
  青岛理工大学土木工程学院,山东,青岛,266033
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU473
- Online First：21 September 2012，
  
  Published：2012
- 稿件说明：
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LIU Jun-wei, ZHANG Ming-yi, KOU Hai-lei. Study of time effect on vertical bearing capacity of open-ended pipe pile[J]. 2012, 33(S1).
DOI：

LIU Jun-wei, ZHANG Ming-yi, KOU Hai-lei. Study of time effect on vertical bearing capacity of open-ended pipe pile[J]. 2012, 33(S1). DOI：

摘要

时间效应是指管桩沉桩后承载力随休止时间的提高。统计分析发现单桩承载力每时间对数的增长范围为15%～29%。桩基承载力的增长源于桩侧土的固结、触变恢复、老化以及蠕变和土壳效应，基于此提出管桩承载力时间效应3阶段理论模型，并建立基于固结理论的开口管桩承载力时效解析计算模型。计算表明，摩擦型开口管桩承载力随时间的相对增长速度随土塞率近似呈线性增长；完全非闭塞的摩擦型开口管桩承载力的相对增长速度高出闭口桩约10%。

Abstract

Time effect is defined as an increase in pile capacity over time after installation. The statistical analysis reveals that the average increase rate of bearing capacity for single pile is in the range of 15%-29% per log cycle. The set-up on the pile capacity is mainly due to the consolidations

the gains on shear strength，the aging

the creep and shell effect of surrounding soils. Based on the mechanism of pile set-up

a three-phase conceptual model is establisbed. In addition

a computation model is proposed based on consolidation theory for evaluating the soil set-up on pile capacity. The research indicates that the relative setup rate for friction-type open-ended pile under full coring condition is 10% larger than that for corresponding closed-ended pile.

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