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Experimental and numerical characteristics of soil response to intense heating.

机译:土壤对强烈加热反应的实验和数值特征。

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摘要

This work investigates the thermal transient response of different soils when exposed to intense heat flux. A special porous media code, TOUGH2, is applied for numerical analyses. Improvements are made to previous experimental facilities, and new experimental results are used to characterize the heat and mass transfer physics in the soil and verify simulations. A two-zone structure exists for the coarse sand, namely a liquid zone on top and a two-phase zone at bottom. A large convection cell is developed within the liquid zone. A two-zone structure is also observed in the fine sand. However, at later times the soil begins to dry out, and develops a vapor zone below the two-phase zone. The lower permeability in the fine sand tends to suppress convection, increase pore water pressure and temperatures. Finally, a full scale tunnel simulation is conducted to provide insight into the application of soil response during tunnel fires.
机译:这项工作研究了暴露于强热通量下不同土壤的热瞬态响应。特殊的多孔介质代码TOUGH2用于数值分析。对以前的实验设备进行了改进,并使用了新的实验结果来表征土壤中的传热和传质物理特性,并验证了模拟结果。粗砂存在两区结构,即顶部为液体区,底部为两相区。在液体区域内形成了一个大型对流室。在细砂中也观察到两区结构。但是,在稍后的时间,土壤开始变干,并在两相区下方形成了一个蒸气区。细砂中较低的渗透率往往会抑制对流,增加孔隙水压力和温度。最后,进行了全面的隧道模拟,以洞悉隧道火灾期间土壤响应的应用。

著录项

  • 作者

    Luo, Xiaoxi.;

  • 作者单位

    University of Maryland, College Park.$bFire Protection Engineering.;

  • 授予单位 University of Maryland, College Park.$bFire Protection Engineering.;
  • 学科 Engineering General.
  • 学位 M.S.
  • 年度 2008
  • 页码 59 p.
  • 总页数 59
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程基础科学;
  • 关键词

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