淤泥质黏土火灾高温下导热系数的试验研究

徐婕; 朱合华; 闫治国

淤泥质黏土火灾高温下导热系数的试验研究 English Version

徐婕^1,2,
朱合华^1,2,
闫治国^1,2

1. 同济大学岩土及地下工程教育部重点实验室，上海 200092; 2. 同济大学地下建筑与工程系，上海 200092

基金项目: 国家自然科学基金项目(50978197);教育部创新团队发展计划项目(IRT1029);上海市领军人才计划与曙光跟踪计划项目

详细信息

作者简介:
徐婕(1988– )，女，河南开封人，硕士研究生，主要从事隧道及地下工程防灾研究。E-mail: xujiexiaomo@yahoo.cn

中图分类号: TU411
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出版历程
- 收稿日期: 2011-11-13
- 发布日期: 2012-12-19

Experimental studies on coefficient of thermal conductivity of silty clay

XU Jie^1,2,
ZHU He-hua^1,2,
YAN Zhi-guo^1,2

1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 对火灾高温下隧道衬砌结构周围饱和软黏土的热传导特性进行了试验研究,旨在进一步探讨作用于隧道结构上的荷载变化,以便准确评价其安全状态.采用热探针程序法(美国材料与试验协会(ASTM)确定土体和软岩导热系数的标准方法),应用自行研制的高温土体导热系数测定仪测定了上海淤泥质黏土在高温下的导热系数.试验分别测定了不同温度及不同含水率条件下土样的导热系数,并以KD2导热系数测定仪作为校准仪器对试验结果进行了校正.试验结果表明导热系数随着温度的升高而增大,且其增大的速率随温度的增加而减小,特别是对含有机质的淤泥质黏土因有机质的高温分解而使得这种降低更加明显;此外,在不同高温下土体导热系数随含水率的增加而增大.
- 淤泥质黏土 /
- 高温 /
- 导热系数 /
- 热探针程序法
Abstract: The researches on heat conduction characteristics of soft soil under high temperature are performed for further determining the load change on tunnel lining structure surrounded by saturated soft soil and accurately evaluating its safety under high temperature of fire. The experiment adopts the method of thermal needle probe procedure, proposed by American Society for Testing and Materials (ASTM) as the standard method for determination of thermal conductivity of soil and soft rock, by using self-made apparatus for coefficient of thermal conductivity of soil to measure the coefficient of thermal conductivity of Shanghai mucky clay under high temperature. The thermal conductivity of soil samples with different water contents is measured respectively under different temperatures. At the same time, as calibrating instrument, the KD2 thermal conductivity measuring apparatus is used to calibrate the test results. The test results indicate that the thermal conductivity of soil with the same water content increases with the increase of temperatures. When the temperature is low, the increase rate of thermal conductivity of soil is higher, and when the temperature is high, the increase rate of thermal conductivity of soil is lower, which is more serious due to the decomposition of the organic soil under high temperatures. Further, the thermal conductivity of soil with the same temperature increases with the increase of water content.
- silty clay /
- high temperature /
- coefficient of thermal conductivity /
- thermal needle probe procedure

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参考文献(20)

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