聚丙烯纤维混凝土耐久性与冻融损伤模型研究

Polypropylene Fiber Concrete Durability and Freeze-thaw Damage Model Research

掺入适量聚丙烯纤维即可以提高混凝土力学性能,又能够很好地改善混凝土耐久性。通过完成不同纤维掺量聚丙烯纤维混凝土抗水渗透试验、抗冻试验,得出耐久性最佳配合比。利用现有理论,结合数值分析最小二乘拟合方法,建立以相对动弹性模量和冻融累积损伤为损伤变量聚丙烯纤维混凝土的冻融损伤模型,完善现有软岩隧道喷层支护耐久性理论,对于软岩隧道支护技术发展具有广泛推广意义。

Mixed with proper amount of polypropylene fiber can improve the mechanical properties of concrete and can effectively improve the durability of concrete. By completing different fiber content of polypropylene fiber concrete resistance to water penetration test, frost resistance test, it is concluded that the durability of optimal mixture ratio. Use of the existing theory combined with the numerical analysis of the least squares fitting method to establish relative dynamic elastic modulus and freezethaw cumulative damage as damage variable of polypropylene fiber concrete freeze-thaw damage model, improving the durability of shotcrete layer soft rock tunnel supporting existing theory, has widely for soft rock tunnel supporting technology development.