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隧道建设(中英文) ›› 2014, Vol. 34 ›› Issue (增刊): 1-5.DOI: 10.3973/j.issn.1672-741X.2014.S.001

• 研究与探索 •    下一篇

应用连续热驱法研析隧道水泥衬砌之拉力强度与破裂韧度受热的影响

陈尧中1, 刘峵玮1, 陈立宪2, 张育诚1   

  1. (1.台湾科技大学, 台北; 2. 台北科技大学, 台北)
  • 收稿日期:2014-06-16 出版日期:2014-08-15 发布日期:2014-08-11
  • 作者简介:陈尧中 (1959—),台湾台北人,台湾科技大学营建工程所,教授,美国康乃尔大学土木系,博士。
  • 基金资助:

    台湾科学委员会项目计划案(NSC99-2221-011-060-MY3)

Study on Influence of Heat on Tensile Strength and Fracture Toughness of Cementbased Lining by Continued Heat Treatment Method

CHEN Yaochung1, LIU Hungwei1, CHEN Lihsien2, CHANG Yucheng1   

  1. (1. National Taiwan University of Science and Technology, Taipei, Taiwan;  2. National Taipei University of Technology, Taipei, Taiwan)
  • Received:2014-06-16 Online:2014-08-15 Published:2014-08-11

摘要:

隧道火灾可能毁损隧道衬砌支撑,造成隧道坍塌。通过对热损分布关系进一步了解,有助于在灾前提高材料的防火性能设计,并在灾后较精准的预测其损害范围,进而降低修缮成本。以往的研究都采用个别式热损试样准备法,无法准确预测没有试验数据的结果,故本研究提出连续热驱试样准备法,从而得出连续性的试验数据。本研究研析水泥砂浆受连续热损后,其拉力强度及破裂韧度与温度的相互关系。藉由试验结果,除可获得较为精确的预测方程外,并以LogLog交点法得到相对合理与准确的临界热损温度(540~550 ℃),以期为隧道火灾防范提供参考。

关键词: 连续热驱试样准备法, 隧道火灾, LogLog法, 拉力强度, 破裂韧度

Abstract:

Tunnel lining could be damaged by tunnel fire, which may directly or indirectly induces the collapsing of tunnel. If engineers could better understand the distribution of thermoinduced damage, they can either improve the design by considering the protective measures beforehand, or they can provide better repairing plans by predicting the damage zones more accurate after tunnel fire. Previous researches used discrete heat treatment method to prepare the specimens; predictions between data points cannot be accurate. In this research, continued heat treatment method was used to prepare the specimens; the tensile strength and fracture toughness of the heattreated specimens were investigated. Based on test results, a more rational and accurate prediction equation is proposed and the critical damaging temperature is found to be about 540~550 ℃. The test results can be used as reference in engineering design for better protection of tunnel lining against fire. 

Key words: continued heat treatment method, tunnel fire, LogLog method, tensile strength, fracture toughness

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