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<p>The aim of this article is to investigate how varying the content of plastic and non-plastic fines influences soil behavior. Initial relative density is particularly highlighted in the experiments. Test findings indicated that the fine content plays a significant role in reducing the dilatant character of the soil for sand-silt samples. The quantity of fine particles present in the mixture affects the soil’s ability to liquefy, but only up to a certain fine content of 40%. For the sand-clay mixture (kaolin), behavior stabilization takes place at a fines content Fc = 20%. The presence of fines leads to little variation of steady state friction angle up to Fc = 10%; beyond this value, the friction angle was gradually increased considering the rising trend in fine content. According to the test results, two separate zones were identified; the first zone where the fines occupy only the voids and have a negative effect on participation in the undrained resistance. The second zone, the granular void ratio, has no influence on the undrained resistance. This zone is marked by a high proportion of fine soils which control the behavior of the mixture.</p>

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Fines Content and its Plasticity Effect on the Undrained Mechanical Behavior of Sandy Soils

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Ismail Benessalah,
  • Maria Arab,
  • Ahmed Arab

摘要

The aim of this article is to investigate how varying the content of plastic and non-plastic fines influences soil behavior. Initial relative density is particularly highlighted in the experiments. Test findings indicated that the fine content plays a significant role in reducing the dilatant character of the soil for sand-silt samples. The quantity of fine particles present in the mixture affects the soil’s ability to liquefy, but only up to a certain fine content of 40%. For the sand-clay mixture (kaolin), behavior stabilization takes place at a fines content Fc = 20%. The presence of fines leads to little variation of steady state friction angle up to Fc = 10%; beyond this value, the friction angle was gradually increased considering the rising trend in fine content. According to the test results, two separate zones were identified; the first zone where the fines occupy only the voids and have a negative effect on participation in the undrained resistance. The second zone, the granular void ratio, has no influence on the undrained resistance. This zone is marked by a high proportion of fine soils which control the behavior of the mixture.