Study of improvement mechanism of compaction-widening piles by tamping in collapsible loess foundation

NIE Qing-ke; LIANG Jin-guo; HAN Li-jun; LI Hua-wei

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Study of improvement mechanism of compaction-widening piles by tamping in collapsible loess foundation

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- Study of improvement mechanism of compaction-widening piles by tamping in collapsible loess foundation
- Vol. 32, Issue 6, (2011)
- 作者机构：
  
  1. 河北建设勘察研究院有限公司,石家庄,050031
  2. 河北省岩土工程技术研究中心,石家庄,050031
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU473
- Online First：21 June 2011，
  
  Published：2011
- 稿件说明：
移动端阅览
NIE Qing-ke, LIANG Jin-guo, HAN Li-jun, et al. Study of improvement mechanism of compaction-widening piles by tamping in collapsible loess foundation[J]. 2011, 32(6).
DOI：

NIE Qing-ke, LIANG Jin-guo, HAN Li-jun, et al. Study of improvement mechanism of compaction-widening piles by tamping in collapsible loess foundation[J]. 2011, 32(6). DOI：

摘要

通过现场试验对夯扩挤密桩加固湿陷性黄土地基的机理进行研究。利用现场取得的加固前的原状土样和加固后的土样进行室内对比试验，测定加固前、后桩间土的物理力学性质指标（如孔隙比、湿陷系数和密实系数等）的变化。根据这些结果，分析了夯扩挤密桩加固湿陷性黄土地基的效果和夯扩挤密桩在水平方向和深度方向的挤密程度和影响范围。最后讨论了工程实践中夯扩挤密桩设计应采取的合理的桩间距

Abstract

According to a practical case of composite foundation in collapsible loess foundation

the squeezing effects on compaction pile by tamping are studied. In field test

the undisturbed samples before treatment and the samples after treatment are first obtained; and then the physical parameters (e.g. void ratio

coefficient of collapsibility

coefficient of compactness

etc) are studied. Using the test results

the squeezing effects of the soil between piles with loading variation are discussed. Besides

the affecting scopes in horizontal and vertical directions are also analyzed. Finally

the reasonable spacing between piles which should be used in practical applications is discussed.

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