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Updated: May 12, 2025

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评估后期粘土土壤在热带地区道路基础设施的潜力
Antônio Carlos Rodrigues Guimarães1, Albeds Mesquita Povuação1, Gabriel de Carvalho Nascimento2
1Department of Fortification and Construction Engineering, Military Institute of Engineering-IME, Praça General Tibúrcio, 80, Urca, Rio de Janeiro 22290-270, Brazil.
Materials (Basel, Switzerland)
|May 7, 2025
概括
后期粘土由于其强度显示出路面层的潜力. 然而,高压力水平可能会增加永久变形 (PD),需要仔细考虑其应用的负载条件.
科学领域:
- 地质技术工程 地质技术工程
- 土壤科学 土壤科学
- 材料科学 材料科学 材料科学
背景情况:
- 后期土壤在热带地区很常见,但在路面施工中经常被不足利用.
- 保守的土壤分类可能低估了横岩土的机械潜力.
- 了解横岩粘土的行为对于优化其在基础设施中的使用至关重要.
研究的目的:
- 评估来自圣保罗的一种特定的横岩粘土 (紫色粘土) 的地质技术行为.
- 在重复负荷下评估其永久变形 (PD) 和弹性模量 (RM).
- 研究矿物学和压缩对其机械性能的影响.
主要方法:
- 进行重复负载三轴测试以确定PD和RM.
- 使用X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 来分析土壤结构和矿物学.
- 压缩的变化是为了评估其对机械性能的影响.
主要成果:
- 高氧化铁含量与增加的凝聚力和机械强度相关.
- 在中等Proctor能量下压缩的紫色粘土显示了与颗粒材料相比的弹性模量 (RM).
- 永久变形 (PD) 在高应力水平下明显高 (高达42%) 比参考材料.
结论:
- 后期粘土,特别是紫色粘土,由于其强度,具有铺路应用的潜力.
- 压缩能量和应力水平极大地影响了路面上的横岩土壤的性能.
- 需要进行进一步的研究,以优化横岩土壤的使用,通过在不同负载下管理永久变形来优化其使用.
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