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<p>Disintegrated carbonaceous mudstone (DCM) is highly moisture-sensitive and undergoes significant disintegration under cyclic drying and wetting, posing challenges for its use in geotechnical engineering. This study investigates the stabilization of DCM using cement and polyurea (PU) to improve its hydraulic properties, specifically the saturated permeability coefficient (SPC) and the soil-water characteristic curve (SWCC). A series of tests were conducted to quantify the effects of stabilizer content, compaction degree, initial moisture content, curing period, and drying-wetting cycles on the hydraulic behavior of modified DCM. The results show that both cement and PU modification effectively enhance the hydraulic performance of DCM. The SPC decreases with higher compaction degree and longer curing period. While the SPC of PU-modified DCM (PU-MDCM) reduces with increased PU content, cement-modified DCM (cement-MDCM) shows a slight increase in SPC after repeated drying-wetting cycles; however, both stabilized soils maintain a low SPC. SWCCs obtained from the pressure-plate and filter paper methods showed consistent results up to 200&#xa0;kPa matrix suction. The water-holding capacity is influenced by stabilizer type: increased cement content reduces it, whereas for PU, the influencing factors are, in order of significance, PU content, A:B ratio, and compaction degree. The permeability function predicted by the Childs &amp; Collis-Geroge model reveals that the unsaturated permeability coefficient of MDCM follows an exponential decay relationship with both matric suction and volumetric water content. This study provides validated stabilization strategies and key design parameters for carbonaceous mudstone in subgrade and foundation engineering.</p>

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Effect of experimental parameters on saturated permeability and soil-water characteristic curves of modified carbonaceous mudstone

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Caiying Chen,
  • Ling Zeng,
  • Hongyuan Fu,
  • Jue Li

摘要

Disintegrated carbonaceous mudstone (DCM) is highly moisture-sensitive and undergoes significant disintegration under cyclic drying and wetting, posing challenges for its use in geotechnical engineering. This study investigates the stabilization of DCM using cement and polyurea (PU) to improve its hydraulic properties, specifically the saturated permeability coefficient (SPC) and the soil-water characteristic curve (SWCC). A series of tests were conducted to quantify the effects of stabilizer content, compaction degree, initial moisture content, curing period, and drying-wetting cycles on the hydraulic behavior of modified DCM. The results show that both cement and PU modification effectively enhance the hydraulic performance of DCM. The SPC decreases with higher compaction degree and longer curing period. While the SPC of PU-modified DCM (PU-MDCM) reduces with increased PU content, cement-modified DCM (cement-MDCM) shows a slight increase in SPC after repeated drying-wetting cycles; however, both stabilized soils maintain a low SPC. SWCCs obtained from the pressure-plate and filter paper methods showed consistent results up to 200 kPa matrix suction. The water-holding capacity is influenced by stabilizer type: increased cement content reduces it, whereas for PU, the influencing factors are, in order of significance, PU content, A:B ratio, and compaction degree. The permeability function predicted by the Childs & Collis-Geroge model reveals that the unsaturated permeability coefficient of MDCM follows an exponential decay relationship with both matric suction and volumetric water content. This study provides validated stabilization strategies and key design parameters for carbonaceous mudstone in subgrade and foundation engineering.