Load transfer mechanism of geotextile-reinforced sand layer over semirigid column-improved soft soil

Wu, Pei-Chen1; Chen, Wen-Bo2; Feng, Wei-Qiang3; Yin, Jian-Hua1; Ho, Tsz-On4; Huang, Shu-Ran1

2024-05-01

10.1007/s11440-023-02213-8

ACTA GEOTECHNICA   影响因子和分区

1861-1125

1861-1133

Many design guidelines have been proposed for piled embankments, most of which consider piles or columns as rigid inclusions. In this study, a small-scale physical model test was performed to investigate the load transfer mechanism of a geotextile-reinforced sand layer over a soft subsoil improved by semirigid columns. A multi-stage load was applied at the top of the sand layer until the columns started to yield. When the columns yielded, a reverse load transfer was observed. Vertical stresses were measured and analyzed in terms of efficacy and stress reduction ratio (SRR) with a comparison of existing design guidelines for assessing soil arching. Among the reviewed guidelines, the approach recommended by the Dutch guidelines provided the closest results to the experimental data, whereas the one adopted by the American guidelines predicted well the change in efficacy and SRR under different surcharge loads. However, the load transfer mechanism after the yielding of columns is beyond the scope of the existing design guidelines. In addition, it was found through regression analysis that the increment of vertical stresses on columns and surrounding soil followed an inclined line under partially undrained conditions during loading stages and a curve during consolidation.

Geotextile Load transfer mechanism Physical model test Soft soil Semirigid columns

SCI

英语

其他

University Grants Committee[R5037-18] ; Research Impact Fund (RIF) project["PolyU 15210020","PolyU 15210322","PolyU 15226722"] ; Research Institute for Land and Space of The Hong Kong Polytechnic University["CD82","CD7A"]

Engineering

Engineering, Geological

WOS:001160437300001

SPRINGER HEIDELBERG

Web of Science

1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China
2.Shenzhen Univ, Coll Civil & Transportat Engn, Shenzhen 518000, Peoples R China
3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China
4.Ove Arup & Partners Hong Kong Ltd, Hong Kong, Peoples R China

Wu, Pei-Chen,Chen, Wen-Bo,Feng, Wei-Qiang,et al. Load transfer mechanism of geotextile-reinforced sand layer over semirigid column-improved soft soil[J]. ACTA GEOTECHNICA,2024,19(5).

Wu, Pei-Chen,Chen, Wen-Bo,Feng, Wei-Qiang,Yin, Jian-Hua,Ho, Tsz-On,&Huang, Shu-Ran.(2024).Load transfer mechanism of geotextile-reinforced sand layer over semirigid column-improved soft soil.ACTA GEOTECHNICA,19(5).

Wu, Pei-Chen,et al."Load transfer mechanism of geotextile-reinforced sand layer over semirigid column-improved soft soil".ACTA GEOTECHNICA 19.5(2024).