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<p>Granite residual soil (GRS) exhibits pronounced softening-disintegration behavior that frequently triggers geohazards (e.g., landslides and foundation collapses). Cementitious and fibrous additives demonstrate significant stabilization potential, mitigating geohazards in GRS regions. Conventional disintegration assessments exhibit critical limitations (e.g., the volume method suffers from poor accuracy, while the mass method neglects water absorption effects). To bridge these gaps, we developed an integrated mass-water absorption method that quantitatively assesses the effects of the two curing agents on GRS disintegration while elucidating failure mechanisms through morphological, compositional, and strength theory analyses. Key findings reveal that (1) the proposed coupled mass-water absorption method significantly improves the reliability of disintegration assessment by overcoming the critical limitations of conventional approaches. (2) The disintegration process comprises two distinct phases: moisture absorption and surface fragmentation (dominated by matric suction-driven water infiltration) and softening and separation (controlled by cement dissolution-induced bond weakening). (3) Cement (2%) and fiber (0.1–0.3%) curing agents enhanced soil disintegration resistance through distinct mechanisms—hydration-induced cohesion/pore-filling (90% improvement, final disintegration ratio ~ 10%) versus fiber-particle friction/restraint (60%, ~ 40% ratio). Both most effectively mitigated Phase II disintegration, with cement reducing the mean rate to 5% (versus a 50% increase for plain soil) and fiber to 33% of the Phase I value. (4) Fiber reinforcement is recommended for eco-sensitive areas, while cement stabilization is preferred for critical infrastructure, achieving a balance between sustainability and geotechnical performance. Future research should focus on optimizing cement dosages and developing low-carbon binders to advance sustainable geotechnical solutions. These findings provide actionable guidelines for engineering practice and geohazard mitigation in GRS regions.</p>

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Disintegration Behavior of Granite Residual Soil Stabilized with Cement and Fiber Additives

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Yicheng Chen,
  • Xiaotao Ai,
  • Xiaowen Zhou,
  • Xiashu Yang,
  • Chenliang Wei

摘要

Granite residual soil (GRS) exhibits pronounced softening-disintegration behavior that frequently triggers geohazards (e.g., landslides and foundation collapses). Cementitious and fibrous additives demonstrate significant stabilization potential, mitigating geohazards in GRS regions. Conventional disintegration assessments exhibit critical limitations (e.g., the volume method suffers from poor accuracy, while the mass method neglects water absorption effects). To bridge these gaps, we developed an integrated mass-water absorption method that quantitatively assesses the effects of the two curing agents on GRS disintegration while elucidating failure mechanisms through morphological, compositional, and strength theory analyses. Key findings reveal that (1) the proposed coupled mass-water absorption method significantly improves the reliability of disintegration assessment by overcoming the critical limitations of conventional approaches. (2) The disintegration process comprises two distinct phases: moisture absorption and surface fragmentation (dominated by matric suction-driven water infiltration) and softening and separation (controlled by cement dissolution-induced bond weakening). (3) Cement (2%) and fiber (0.1–0.3%) curing agents enhanced soil disintegration resistance through distinct mechanisms—hydration-induced cohesion/pore-filling (90% improvement, final disintegration ratio ~ 10%) versus fiber-particle friction/restraint (60%, ~ 40% ratio). Both most effectively mitigated Phase II disintegration, with cement reducing the mean rate to 5% (versus a 50% increase for plain soil) and fiber to 33% of the Phase I value. (4) Fiber reinforcement is recommended for eco-sensitive areas, while cement stabilization is preferred for critical infrastructure, achieving a balance between sustainability and geotechnical performance. Future research should focus on optimizing cement dosages and developing low-carbon binders to advance sustainable geotechnical solutions. These findings provide actionable guidelines for engineering practice and geohazard mitigation in GRS regions.