隧道火灾后衬砌材料物理力学性能变化试验研究

Experimental Studies of the Mechanical Property Changes Caused by Fire in the Tunnel Lining Materials

通过对衬砌混凝土在不同温度等级下的烧损试验 ,及其随后的电子显微镜扫描观察 ,分析了组织结构变化情况 ,并用X射线法对其矿物成分进行了分析 ,研究了四种温度状态下的弹性模量的变化规律。试验结果表明 ,隧道火灾后衬砌材料随温度的升高 ,其破坏程度越明显 。

According to the experiments on the damage degree of the lining concrete at different temperatures, and also the following observations on the structure by scanning under a electronic microscope with X-ray diffraction method. In this paper, the organization changes and mineral components in lining concrete are studied; and then the changing rules of the elastic model under four kinds of state at different temperatures are analyzed. The experiment results show that the higher the temperature of the lining materials increases, the more evident the damage degree will be. As a result, the supporting ability of the tunnel structure will be greatly affected.