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This research paper explores the innovative application of coal mine overburden (OB) dump materials in conjunction with clayey soil to improve its suitability as a sub-grade layer in pavement construction. A comprehensive series of laboratory experiments, encompassing the modified Proctor test, soaked California bearing ratio (CBR) test, and unconfined compressive strength (UCS) test, were conducted to investigate the influence of varying proportions from 10 to 30% of OB dump materials on the clayey soil. The integration of overburden dumps yielded substantial enhancements in CBR values from 4.49 to 8.029%, reduced settlement, and enhanced the overall resilience of the soil. Additionally, numerical modeling with “PLAXIS 3D” was employed to predict vertical deformations and sub-grade layer strength. The results demonstrated a notable decrease in settlement by 48.62 and 22.72% increase in load bearing capacity when 30% overburden dump materials were integrated. Beyond these technical benefits, overburden dumps in industrial applications hold the promise of fostering economic growth and creating employment opportunities. Furthermore, it offers a sustainable and environmentally friendly solution for managing unsightly and contaminated stockpiles, contributing to a more responsible and ecologically conscious approach to waste management.

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Enhancing Clayey Sub-grade Performance in Pavement Construction with Coal Mine Overburden Dump Materials: A Sustainable Approach

  • 会议论文

  • 发表日期：

    2025年

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  • Karuna Kumari,
  • Keshav Kumar Singh,
  • Sahinur Rahaman Mondal,
  • Arindam Karmakar,
  • Supriya Pal

摘要

This research paper explores the innovative application of coal mine overburden (OB) dump materials in conjunction with clayey soil to improve its suitability as a sub-grade layer in pavement construction. A comprehensive series of laboratory experiments, encompassing the modified Proctor test, soaked California bearing ratio (CBR) test, and unconfined compressive strength (UCS) test, were conducted to investigate the influence of varying proportions from 10 to 30% of OB dump materials on the clayey soil. The integration of overburden dumps yielded substantial enhancements in CBR values from 4.49 to 8.029%, reduced settlement, and enhanced the overall resilience of the soil. Additionally, numerical modeling with “PLAXIS 3D” was employed to predict vertical deformations and sub-grade layer strength. The results demonstrated a notable decrease in settlement by 48.62 and 22.72% increase in load bearing capacity when 30% overburden dump materials were integrated. Beyond these technical benefits, overburden dumps in industrial applications hold the promise of fostering economic growth and creating employment opportunities. Furthermore, it offers a sustainable and environmentally friendly solution for managing unsightly and contaminated stockpiles, contributing to a more responsible and ecologically conscious approach to waste management.