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大跨度地下洞室开挖一直以来都是地下工程施工的重点和难点,其松弛塌落范围比单拱洞室要大得多,作用在支护衬砌结构上的荷载也要比单拱洞室大得多,如何保持围岩的稳定性成了急需解决的技术难题。文章通过结合某水电站地下洞室开挖工程实例,该工程难点在于地下洞室大跨度、高边墙的开挖稳定问题,为确保开挖施工安全,针对各个洞室采取严格的开挖施工技术措施,为同类工程提供参考实例。
Long-span underground tunnel excavation has always been the focus and difficulty of underground construction, the scope of its slump is much larger than the single-arch tunnel, load acting on the support lining structure than single-arch tunnel Much larger, how to maintain the stability of the surrounding rock has become an urgent need to solve the technical problems. By combining the example of underground cavern excavation project of a certain hydropower station, the difficulty of this project lies in the stability of large-span and high-side wall excavation of underground caverns. In order to ensure the safety of excavation construction, strict excavation technology is adopted for each caverns Measures for similar projects to provide reference examples.