添加沙子对后石土壤稳定性的影响
Bárbara Drumond Almeida1, Lisley Madeira Coelho1, Antônio Carlos Rodrigues Guimarães1
1Department of Fortification and Construction, Military Institute of Engineering-IME, Praça General Tibúrcio, 80, Urca, Rio de Janeiro 22290-270, Brazil.
将沙子添加到横岩土壤中并没有改善它们在路面施工中的机械性能. 纯岩表现出优越的弹性模量和较低的永久变形,使其成为适合柔性路面的材料.
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 材料科学 材料科学
背景情况:
- 晚期土壤在热带地区丰富,在巴西有史以来在柔性路面上被用于未结合的层.
- 传统的方法往往不采用横岩土壤,或者需要根据等级和阿特伯格极限等有限参数进行稳定.
研究的目的:
- 调查罗拉玛横岩土壤的机械特性,重点关注弹性模量和永久变形.
- 为了评估添加20%的沙子对横质土壤机械行为的效果,用于路面应用.
主要方法:
- 进行重复负载三轴测试以评估机械性能.
- 进行了摇分析,以评估重复加载下的材料稳定性.
主要成果:
- 石灰岩和砂混合物 (744 MPa) 的平均弹性模量 (RM) 比纯石灰岩土壤 (790 MPa) 低.
- 与沙子混合的混合物经历了与纯石英相比几乎两倍的塑料应变.
- 纯石在摇分析中表现更加稳定,表明耐用性更强.
结论:
- 添加沙子并没有显著提高横岩土的机械性能,用于铺路应用.
- 纯岩土是路面施工的可行材料,与沙子混合物相比,它提供了优越的强度和耐久性.
- 这些发现强调了需要进行超越传统方法的先进机械测试,用于横岩土壤.
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