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通过对经历火灾高温后(100℃~700℃)不同强度等级混凝土(C10、C20、C30、C40)力学性能试验研究,得到混凝土立方体抗压强度(fcu T)随温度的变化规律。对混凝土立方体在抗压试验过程中所产生的声发射现象进行研究,进一步揭示火灾高温处理后的混凝土在破坏过程中,内部裂纹、裂隙的产生扩展与混凝土在受压过程所承受荷载之间的关系,从而得出混凝土受压破坏时内部结构的变化过程,通过详细的描述和比较分析,得到了高温对混凝土破坏过程中声发射现象的影响,进而为火灾高温后隧道衬砌混凝土结构损伤程度及安全性能的评估提供依据。
Through the experimental study on the mechanical properties of concrete with different strength grades (100 ℃ ~ 700 ℃) under fire (100 ℃ ~ 700 ℃), the compressive strength (fcu T) of concrete cubes with temperature was obtained. The phenomenon of acoustic emission generated during the compression test of concrete cubes was studied to further reveal the relationship between the propagation of internal cracks and cracks and the load of concrete during the compression process in the process of failure of high temperature fire treated concrete The relationship between the structure of the concrete and the structure of the tunnel was analyzed. The influence of the high temperature on the acoustic emission during the concrete failure was obtained through the detailed description and comparative analysis, and then the damage degree of the tunnel lining concrete after the high temperature was found. Provide a basis for the assessment of safety performance.