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对于大型人防工程安全度要求高,而其跨度大、埋藏浅、工程地质条件差,本文首先对该工程围岩稳定性进行科学评价,并确定围岩类别,进而提出长锚索、短锚杆,以锚为主,个别地段辅以钢纤维喷射混凝土、锚固钢拱架的喷锚网整体加固围岩方案和相应参数。施工中对开挖顺序进行调整,对锚索、锚杆注浆工艺进行改进,保证了施工安全和工程质量,取得了良好的技术经济效果。
For large-scale civil air defense projects with high safety requirements, and its large span, shallow burial, and poor engineering geological conditions, this article first scientifically evaluates the surrounding rock stability of the project, and determines the type of surrounding rock, and then proposes long anchor cables and short anchor rods. Mainly anchored, individual sections are supplemented by shotcrete nets with steel fiber shotcrete and anchor steel arch reinforcement of the surrounding rock program and corresponding parameters. During the construction, the excavation sequence was adjusted, and the grouting technology of anchor cables and anchor rods was improved to ensure construction safety and project quality, and good technical and economic results were achieved.