Experimental study on settlement of intermixing between miscellaneous fill and soft soil influenced by particle composition

ZHANG Fuhai; XUE Haoyu; CHEN Yu; XU Jiacheng; LIU Zhengrong

doi:10.11835/j.issn.2096-6717.2022.117

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Experimental study on settlement of intermixing between miscellaneous fill and soft soil influenced by particle composition

Civil Engineering | 更新时间：2023-09-19

- Experimental study on settlement of intermixing between miscellaneous fill and soft soil influenced by particle composition
- Journal of Civil and Environmental Engineering Vol. 45, Issue 5, Pages: 10-17(2023)
- 作者机构：
  
  1.河海大学岩土力学与堤坝工程教育部重点实验室；江苏省岩土工程技术工程研究中心，南京 210098
  2.河海大学疏浚技术教育部工程研究中心，江苏常州 213022
- 作者简介：
  
  ZHANG Fuhai (1970- ), PhD, professor, main research interests: soft soil foundation treatment and geotechnical testing technology, E-mail: fhzhang@hhu.edu.cn.
- 基金信息：
  
  National Natural Science Foundation of China(51778211)
- DOI：10.11835/j.issn.2096-6717.2022.117
  CLC： TU447
- Received：20 July 2022，
  
  Published：25 October 2023
- 稿件说明：
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ZHANG Fuhai, XUE Haoyu, CHEN Yu, et al. Experimental study on settlement of intermixing between miscellaneous fill and soft soil influenced by particle composition[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 10-17.
DOI：

ZHANG Fuhai, XUE Haoyu, CHEN Yu, et al. Experimental study on settlement of intermixing between miscellaneous fill and soft soil influenced by particle composition[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 10-17. DOI： 10.11835/j.issn.2096-6717.2022.117.

摘要

在受到上覆荷载作用时，杂填土地基下敷淤泥软土会轻易挤入杂填土颗粒之间的孔隙中，造成互嵌沉降，在传统地基沉降计算中这部分沉降未被考虑。而杂填土级配不均，其孔隙率与粒径组分密切相关。选取4种不同粒径颗粒组，以不同粒径的杂填土颗粒组成的二元混合物为研究对象，利用自制互嵌仪进行互嵌试验，揭示二元混合颗粒中不同粒径比、小颗粒含量下杂填土与软土的总沉降与互嵌沉降发展规律。研究结果表明：二元混合颗粒组成中，当小颗粒占主体时，互嵌沉降随着小颗粒粒径的增大而增大；当大小颗粒含量相同时，随着小颗粒粒径的增大，互嵌沉降呈先减小后增大的趋势；当小颗粒含量较少时，互嵌沉降随着小颗粒粒径的增大而减小。而在杂填土大小颗粒含量变化过程中，小颗粒粒径较小时，互嵌沉降随着颗粒含量的增加而减小；小颗粒粒径较大时，颗粒含量的增加对杂填土与软土的互嵌沉降影响不大。

Abstract

The soft soil of silt underneath the miscellaneous fill can be easily squeezed into the pores between the particles of the miscellaneous fill under overlying loads

resulting in mutual embedding settlement

which is failed to be taken into account in traditional foundation settlement calculations. But miscellaneous fill has the property of uneven grading

and its porosity is closely related to its particle size component. This paper selected four different particle size groups

a binary mixture of heterogeneous soil particles of different particle sizes was studied

used self-made embedded instrument to investigate the evolution pattern of total settlement and mutual embedded settlement under the different particle size ratios and small particle content of miscellaneous fill by tests. The results indicate that: under binary mixed granular composition

when small particles occupy the body

mutual embedded settlement increases with increase of small particle size

when the content of large and small particles is the same

the mutual embedded settlement tends to decrease first and then increase with increase of the particle size of small particles

when the content of small particles is less

the mutual embedded settlement decreases with increase of particle size; and in the process of particle content change in miscellaneous fill

when the particle size of the small particle is small

mutual embedded settlement decreases with increasing particle content

when the particle size is large

the increase of particle content does not have much effect on the intermixing settlement between the miscellaneous fill and the soft soil.

关键词

Keywords

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