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<p>In some applications, expanded polystyrene (EPS) should resist lateral pressure, horizontal movement, and hydrostatic water pressure, and its interface shear strength parameters must be known for engineering design purposes. To evaluate the interface shear strength behavior, this study investigated the EPS-EPS-EPS interface in dry and saturated conditions by performing direct shear tests on EPS samples with mass densities of 9, 15, 18, and 25&#xa0;kg/m<sup>3</sup>. Two shear displacement rates of 1.8 and 2.7&#xa0;mm/min under normal stresses of 10 to 125&#xa0;kPa were used. The findings indicated that as the shear displacement rate increased, the interface cohesion (c<sub>a</sub>) decreased by up to 48% for dry EPS samples, while an increase of up to 100% was observed for saturated samples. Similarly, the interface friction angle (δ) increased up to 67% for dry samples and decreased up to 52% for saturated samples. The average peak and residual interface shear strengths of the saturated samples were significantly lower than those of the dry samples. The interface friction parameter (μ) was found to range from 0.75 to 0.87 for different mass densities in dry and saturated conditions. Additionally, an increased shear rate induced damage to all layers of the dry samples.</p>

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Comparative Analysis of Shear Strength at the Interface of Dry and Saturated EPS Blocks

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Mahmoud Ghazavi,
  • Marjan Khosravi

摘要

In some applications, expanded polystyrene (EPS) should resist lateral pressure, horizontal movement, and hydrostatic water pressure, and its interface shear strength parameters must be known for engineering design purposes. To evaluate the interface shear strength behavior, this study investigated the EPS-EPS-EPS interface in dry and saturated conditions by performing direct shear tests on EPS samples with mass densities of 9, 15, 18, and 25 kg/m3. Two shear displacement rates of 1.8 and 2.7 mm/min under normal stresses of 10 to 125 kPa were used. The findings indicated that as the shear displacement rate increased, the interface cohesion (ca) decreased by up to 48% for dry EPS samples, while an increase of up to 100% was observed for saturated samples. Similarly, the interface friction angle (δ) increased up to 67% for dry samples and decreased up to 52% for saturated samples. The average peak and residual interface shear strengths of the saturated samples were significantly lower than those of the dry samples. The interface friction parameter (μ) was found to range from 0.75 to 0.87 for different mass densities in dry and saturated conditions. Additionally, an increased shear rate induced damage to all layers of the dry samples.