为有效控制高温、高湿环境下隧道施工过程中喷射混凝土的开裂风险，探究高温、高湿环境下隧道喷射混凝土材料力学演化规律，提出考虑热力耦合效应下隧道支护结构荷载的计算方法。为改善高温、高湿环境对混凝土材料的影响，提出纤维增强喷射混凝土设计方法，包括材料配合比设计、材料和成型环境的辅助降温措施。同时，基于理论推导建立高温、高湿隧道钢纤维喷射混凝土的裂缝评价方法，依托理论分析对钢纤维喷射混凝土进行现场裂缝检验。根据高温、高湿环境下隧道喷射混凝土力学性能变化公式，隧道喷射混凝土温度等效荷载计算方法以及钢纤维喷射混凝土裂缝评价方法计算裂缝宽度，结果表明： 经过合理设计隧道喷射混凝土配合比，可使钢纤维喷射混凝土裂缝宽度w=0.14 mm，小于裂缝极限宽度wmax=0.2 mm，满足安全规范要求，符合现场裂缝检验结果； 纤维增强喷射混凝土以及辅助降温措施可以有效控制高温、高湿环境下隧道喷射混凝土裂缝的开展。

Shotcrete cracks are common in tunnels in high temperature and high humidity environments. Therefore, to investigate the mechanical evolution patterns of shotcreting materials in tunnels in high temperature and high humidity environments, a calculation method for tunnel support structure load considering thermal coupling effect is proposed. To minimize the impact of high temperature and humidity on concrete materials, a design method for fiber reinforced shotcrete is proposed. This design includes material mix proportions and auxiliary cooling measures for materials and environment. Moreover, a crack evaluation method for tunnel shotcrete in high temperature and high humidity environments is established based on theoretical derivation, and onsite crack inspection of steel fiber shotcrete is conducted based on theoretical analysis. The results indicate that after reasonable design of the tunnel shotcrete mix ratio, the crack width of steel fiber shotcrete 〖WT〗w〖WT《TNR》〗 is 0.14 mm, which is smaller than the crack limit width〖WT〗 wmax 〖WT《TNR》〗of 0.2 mm, meeting safety regulations. Thus, the fiber reinforced shotcrete and auxiliary cooling measures can effectively control the development of cracks in tunnel shotcrete in high temperature and humidity environments.