现行的隧道研究及标准指出纤维材料对隧道抗震性能提升有显著作用，但在工程设计及研究上的定量分析仍不充分，尤其是对各类纤维材质的增韧效果差异性比较等研究相对较少。为进一步明确各类纤维材料对隧道结构的韧性提升效果，基于已有的案例分析，首先，梳理各类纤维材料的增韧抗裂机制，总结特殊地质下纤维混凝土管片的抗震性能及抗震措施上的应用效果。然后，基于钢纤维及各类性能纤维增强混凝土的轴拉本构模型，构建各类纤维材质的三维隧道有限元结构分析模型，并通过对各类纤维材料隧道的地震响应分析，拟合出不同的脆弱性曲线。最后，参照隧道在不同破坏状态的划分指标及判定方法，评估了不同纤维增强混凝土隧道的抗震韧性水平。对比发现：
在相同地震作用下，普通混凝土衬砌隧道相比于钢纤维混凝土和混杂纤维混凝土材质的隧道破坏概率更高；在提高隧道抗破坏性能方面，混合纤维混凝土的增韧抗裂作用强于普通混凝土的加筋作用。因此，适度比例的钢纤维体积分数对提高塑性混凝土基体的韧性有显著作用。
In current tunnel research and standards, fiber
materials significantly improve the seismic performance of tunnels.
Quantitative analyses are still insufficient in engineering design and research,
especially the comparison of the difference in toughening effect of various
fiber materials. To further clarify the toughness improvement effect of various
fiber materials on tunnel structures, the authors summarize the toughening and
crack resistance mechanism of various fiber materials based on existing case
analysis, and analyze the seismic performance of fiber reinforced concrete
segments and the application effect of seismic measures under special
geologies. Finally, based on the axial constitutive models of various fiber-reinforced
concrete, three-dimensional finite element structural
analysis models of various fiber materials are constructed. Different
vulnerability curves are fitted through seismic response analysis of various
fiber material tunnels. Additionally, seismic toughness level of various fiber-reinforced concrete tunnels is evaluated based on classification
index and judgment method of tunnels in different failure states. Under the
same seismic action, it is found that the failure probability of ordinary
concrete lining tunnel is higher than that of steel fiber reinforced concrete
and mixed fiber reinforced concrete. In terms of improving the anti-failure performance of tunnels, the toughening and crack resistance
of mixed fiber reinforced concrete is stronger than that of ordinary concrete.
Therefore, the appropriate proportion of steel fiber content has a significant
effect on improving the toughness of the plastic concrete matrix.
