基于物理模型实验和数值模拟的基础上,对因管道故障引起的城市地面崩塌的研究
Jixiang Guo1,2, Yanjun Zhang3,4, Yuxiang Cheng5,6
1College of Construction Engineering, Jilin University, Changchun, 130026, China.
Scientific reports
|February 19, 2025
概括
通过有缺陷的地下管道透地下水导致土壤侵蚀,并可能导致城市地面崩. 了解这种故障机制是防止崩的关键.
科学领域:
- 地质技术工程 地质技术工程
- 环境工程 环境工程
- 计算力学 计算力学 计算力学
背景情况:
- 地下有缺陷管道的漏侵蚀破坏了周围土壤层的稳定.
- 这种不稳定性可能导致城市的地面崩塌,给基础设施和安全带来风险.
研究的目的:
- 研究因管道故障造成的土壤侵蚀的故障机制和机械特性.
- 在漏侵蚀过程中分析微观的土壤水相互作用.
主要方法:
- 进行了一次大规模的物理建模实验.
- 一个结合的计算流体动力学-离散元件方法 (CFD-DEM) 数值模型被开发和利用.
主要成果:
- 地下水的透加速了土壤的运动,有缺陷的管道为侵蚀提供了空间.
- 漏侵蚀率随着流速的增加而升级,导致层层分解超过一个值 (Vmax).
- 覆盖层的厚度会影响洞穴的进展时间,但不会影响最初的侵蚀速率;缺陷和颗粒大小对侵蚀面积的影响很小.
结论:
- 该研究阐明了地下水透在管道引起的地面侵蚀和崩中的关键作用.
- 机械分析显示,应力变化在腔腔发育过程中最为明显,这突显了这一阶段在失败进展中的重要性.
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