隧道衬砌混凝土高温后力学性能试验研究

Experimental Research on Mechanical Property of Tunnel Lining Concrete after High Temperature Effect

对三种隧道衬砌混凝土材料,即C50普通混凝土、CF50钢纤维混凝土和PC50聚丙烯纤维混凝土经历不同高温后的力学性能进行了试验研究,探讨了三者高温后的主要力学指标-峰值应力、峰值应变和弹性模量的变化规律,给出了相应的回归公式,同时还通过对比分析,总结了升温速率和冷却方式对三者的影响。这些结论为隧道衬砌结构抗火分析、设计以及火灾后的评价等提供了理论依据。

In this paper, the tests on mechanical property of C50 concrete, CF50 steel fiber concrete and PC50 PP fiber concrete after different high temperature effects were completed, the variation law of main mechanical indexes-peak stress, peak strain and elastic modulus after different high temperature is discussed, the respective regression equation is obtained, meanwhile the effect of heating-rate and cooling method is generalized. The conclusions obtained provide theoretic basis for fire resistance analysis and design of tunnel lining structures and the evaluation after fire.