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<p>Understanding the shear behavior of thermally desorbed diesel-contaminated soil is critical for evaluating its engineering reuse as fill materials. In this study, diesel-contaminated and uncontaminated soils were subjected to thermal desorption treatment at temperatures ranging from 105 to 600&#xa0;℃. Physicochemical and microscopic tests, including gas chromatography, organic matter analysis, X-ray diffraction, particle size distribution, and scanning electron microscopy, were conducted to elucidate the shear behavior and underlying mechanisms. The results reveal three main geotechnical contributions. First, the shear strength of both soils increases with temperature, with a significant enhancement observed between 400 and 500&#xa0;℃ due to kaolinite dehydroxylation and particle cementation. Second, in the low-to-intermediate temperature range (105–400&#xa0;℃), the lubricating effect of diesel and oil films weaken interparticle contacts, significantly reducing the shear strength and internal friction angle of contaminated soil while also delaying organic matter degradation and mineral transformation. Third, above 500&#xa0;℃, most diesel is removed, and the contaminated soil exhibits a more uniform particle size distribution, leading to higher shear strength parameters than those of uncontaminated soil. Image-based porosity analysis further confirms the dual role of diesel in pores: filling pores at low temperatures, exposing pores during volatilization, and promoting sintering and densification after complete removal. These findings provide a theoretical basis for optimizing thermal desorption remediation processes and for safely reusing remediated soil as backfill in residential foundation platforms and road subgrades.</p>

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Shear Behavior of Thermally Desorbed Diesel-Contaminated Soil

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Xingyu Luo,
  • Zonghui Liu,
  • Yeyang Chun,
  • Dong Zhou,
  • Baoyong Wu,
  • Shengkui Zhong

摘要

Understanding the shear behavior of thermally desorbed diesel-contaminated soil is critical for evaluating its engineering reuse as fill materials. In this study, diesel-contaminated and uncontaminated soils were subjected to thermal desorption treatment at temperatures ranging from 105 to 600 ℃. Physicochemical and microscopic tests, including gas chromatography, organic matter analysis, X-ray diffraction, particle size distribution, and scanning electron microscopy, were conducted to elucidate the shear behavior and underlying mechanisms. The results reveal three main geotechnical contributions. First, the shear strength of both soils increases with temperature, with a significant enhancement observed between 400 and 500 ℃ due to kaolinite dehydroxylation and particle cementation. Second, in the low-to-intermediate temperature range (105–400 ℃), the lubricating effect of diesel and oil films weaken interparticle contacts, significantly reducing the shear strength and internal friction angle of contaminated soil while also delaying organic matter degradation and mineral transformation. Third, above 500 ℃, most diesel is removed, and the contaminated soil exhibits a more uniform particle size distribution, leading to higher shear strength parameters than those of uncontaminated soil. Image-based porosity analysis further confirms the dual role of diesel in pores: filling pores at low temperatures, exposing pores during volatilization, and promoting sintering and densification after complete removal. These findings provide a theoretical basis for optimizing thermal desorption remediation processes and for safely reusing remediated soil as backfill in residential foundation platforms and road subgrades.