Crossing active faults has proven to cause significant damage in tunnels. In this study, a large–scale plate thrust model stimulating the LongMenShan Fault (LMSF) dislocation was established numerically. The characteristic dislocation curve of the fault generated at the stick-slip incidence was derived. Furthermore, a soil-structure FE model was established with a tunnel structure crossing the LMSF Zone, in which the hanging wall and footwall moved according to the abovementioned dislocation curve. To cope with the serious damage of tunnel caused by fault dislocation, the articulated design was adopted. For discovering an appropriate material to construct the articulated sections and enhance the flexibility of tunnel structure, basalt fiber reinforced concrete (BFRC) was studied by SEM test and mechanical tests. The results showed that basalt fiber could increase the tensile capacity and tenacity of concrete and the 0.5% BFRC was selected as the optimal fiber volume content. By applying the 0.5% BFRC articulated design, the length and width of tunnel cracks generated by fault dislocation decreased by 33.45% and 38.11%, respectively. This study could serve as a reference in the design of fault-crossing tunnel projects.

事实证明，穿越活动断层会对隧道造成重大破坏。本研究通过数值模拟建立了模拟龙门山断裂（LMSF）错位的大型板块逆冲模型。推导出在粘滑发生处产生的断层的特征位错曲线。此外，建立了隧道结构的土-结构有限元模型，隧道结构穿过LMSF带，其中上墙和下墙根据上述位错曲线移动。为应对断层错位对隧道造成的严重破坏，采用铰接式设计。为了寻找合适的材料来构建铰接段并提高隧道结构的灵活性，玄武岩纤维增强混凝土（BFRC）通过扫描电镜测试和力学测试进行了研究。结果表明，玄武岩纤维可以提高混凝土的抗拉能力和强度，选择0.5%的BFRC作为最佳纤维体积含量。应用0.5%BFRC铰接设计，断层错位产生的隧道裂缝长度和宽度分别减少了33.45%和38.11%。本研究可为穿越断层隧道工程设计提供参考。