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<p>Magnesite Mine Tailings (MMT) are waste materials generated during the mining and processing of magnesite. The MMT pollutes soil, air and groundwater. To minimise the environmental impacts of MMT, this study investigates the application of MMT as structural fill material through a series of laboratory plate load tests conducted on model strip footing and compared its performance with river sand. The influence of relative density and embedment depth on Ultimate Bearing Capacity (UBC) and modulus of subgrade reactions are investigated. Experimental results revealed that the UBC of MMT increased from 150.54&#xa0;kPa at 25% relative density and surface loading to 762.63&#xa0;kPa at 75% relative density and an embedment depth of 1B. Similarly, the modulus of subgrade reaction for MMT increased from 26,140 kN/m<sup>2</sup>/m at 25% relative density and surface loading to 90,960 kN/m<sup>2</sup>/m at 75% relative density and 1B embedment depth, showcasing superior performance over river sand. The leaching characteristics of MMT, assessed via batch and column leaching tests, indicated manageable risks with appropriate containment measures. Finite element analysis using Plaxis 3D validated the experimental findings, with a strong correlation to laboratory results. This study highlights the efficacy of MMT as a high-strength, eco-friendly structural fill material, significantly reducing environmental impacts from mining waste while addressing the demand of construction industry for sustainable alternatives.</p>

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Utilisation of magnesite mine tailings as sustainable structural fill material: a novel approach to mitigate environmental impact

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • S. Vinodhkumar,
  • S. Balaji,
  • P. Kulanthaivel,
  • R. Deshmukh

摘要

Magnesite Mine Tailings (MMT) are waste materials generated during the mining and processing of magnesite. The MMT pollutes soil, air and groundwater. To minimise the environmental impacts of MMT, this study investigates the application of MMT as structural fill material through a series of laboratory plate load tests conducted on model strip footing and compared its performance with river sand. The influence of relative density and embedment depth on Ultimate Bearing Capacity (UBC) and modulus of subgrade reactions are investigated. Experimental results revealed that the UBC of MMT increased from 150.54 kPa at 25% relative density and surface loading to 762.63 kPa at 75% relative density and an embedment depth of 1B. Similarly, the modulus of subgrade reaction for MMT increased from 26,140 kN/m2/m at 25% relative density and surface loading to 90,960 kN/m2/m at 75% relative density and 1B embedment depth, showcasing superior performance over river sand. The leaching characteristics of MMT, assessed via batch and column leaching tests, indicated manageable risks with appropriate containment measures. Finite element analysis using Plaxis 3D validated the experimental findings, with a strong correlation to laboratory results. This study highlights the efficacy of MMT as a high-strength, eco-friendly structural fill material, significantly reducing environmental impacts from mining waste while addressing the demand of construction industry for sustainable alternatives.