预制内部头 (PIAC) 的缆的机械特性和固性能研究
Bo Liu1,2, Yufang Zhang1,2, Kun Yuan1,2
1Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing, 100081, China.
Scientific reports
|November 1, 2025
概括
一个带有预制内部头 (PIAH) 的新缆显著增加了固力,并减少了应变. 这种改进的缆设计增强了在各种岩层中稳定性和变形控制.
科学领域:
- 地质技术工程 地质技术工程
- 结构工程 结构工程
- 材料科学 材料科学 材料科学
背景情况:
- 传统的缆在提高成本效益的固定力方面存在局限性.
- 在固系统中,改善结构稳定性和减少变形的需求至关重要.
- 现有的缆设计需要针对更广泛的地质应用进行优化.
研究的目的:
- 引入和验证一种新型的缆结构,采用预制内部头 (PIAH).
- 通过理论,实验和数值方法评估PIAH缆的机械性能和可靠性.
- 评估PIAH长度对承载能力,应变,应力分布和变形控制的影响.
主要方法:
- 对PIAH结构的机械模式和故障模式的理论分析.
- 全面物理模型实验,以调查PIAH长度对压力和应变的影响.
- 使用有限差异方法进行数值模拟,以验证实验结果并分析应力度.
主要成果:
- 在PIAH线上,最终应变减少了74.63%,最终承载能力从796.4升至921.2 kN.
- 发现较长的PIAH长度在控制电缆变形和改善整体弹性模量方面更有效.
- 与传统预应力缆 (TPAC) 相比,PIAH设计显著降低了应力度.
结论:
- 预制内部头 (PIAH) 结构大大提高了固力,并改善了料的应变状态.
- PIAH缆提供了更好的稳定性和变形控制,最佳有效长度约为1.52米.
- 这种创新的缆适用于硬岩和软岩,具有显著的工程应用潜力.
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