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<p>Owing to mismanagement, Chinese landfills are currently burdened with sludge, necessitating a comprehensive study of the shear strength of sludge-containing municipal solid waste (MSW). In this study, 56 laboratory direct shear and triaxial tests were conducted on sludge and MSW sourced from the Hangzhou Tianziling landfill. The experimentally derived shear strength parameters and corresponding mechanisms of strength change are innovative and reliable. The MSW exhibited notable strain-hardening characteristics, revealing a linear correlation between the shear strength and sludge content. Additionally, the ratio of the shear strength to the logarithm of the confining pressure was linearly correlated with the sludge content of the MSW. The cohesion–sludge content relationship followed a parabolic pattern, reaching its maximum value when the sludge content was approximately 30%, whereas the angle of internal friction decreased as the sludge content increased. In the direct shear test, the cohesive force was 8.9–12.3&#xa0;kPa, and the angle of internal friction was 10.2–14.4°. Conversely, in the triaxial test, the cohesive force was 9.6–11.7&#xa0;kPa, effective cohesive force was 12.0–17.4&#xa0;kPa, angle of internal friction was 9.2–14.6°, and effective angle of internal friction was 9.8–21.8°. This study revealed that the addition of sludge primarily affected the internal friction angle of MSW, causing it to decrease by 29–37%.</p>

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Effect of sludge content on the shear strength characteristics of municipal solid waste

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • J. Zheng,
  • Z. Zhang,
  • H. Ke,
  • J. Lan,
  • C. Wang

摘要

Owing to mismanagement, Chinese landfills are currently burdened with sludge, necessitating a comprehensive study of the shear strength of sludge-containing municipal solid waste (MSW). In this study, 56 laboratory direct shear and triaxial tests were conducted on sludge and MSW sourced from the Hangzhou Tianziling landfill. The experimentally derived shear strength parameters and corresponding mechanisms of strength change are innovative and reliable. The MSW exhibited notable strain-hardening characteristics, revealing a linear correlation between the shear strength and sludge content. Additionally, the ratio of the shear strength to the logarithm of the confining pressure was linearly correlated with the sludge content of the MSW. The cohesion–sludge content relationship followed a parabolic pattern, reaching its maximum value when the sludge content was approximately 30%, whereas the angle of internal friction decreased as the sludge content increased. In the direct shear test, the cohesive force was 8.9–12.3 kPa, and the angle of internal friction was 10.2–14.4°. Conversely, in the triaxial test, the cohesive force was 9.6–11.7 kPa, effective cohesive force was 12.0–17.4 kPa, angle of internal friction was 9.2–14.6°, and effective angle of internal friction was 9.8–21.8°. This study revealed that the addition of sludge primarily affected the internal friction angle of MSW, causing it to decrease by 29–37%.