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CD法又称中隔壁法,用于浅埋大断面隧道开挖,是在地质条件要求分部开挖及时封闭的条件下采用,采用CD法开挖减小软弱围岩隧道及大跨度隧道分部开挖跨度和开挖高度,通过增加中壁墙等临时支护构件,形成分部开挖,初期支护快速封闭环,使分部开挖环环相扣,最后完成全部断面开挖与初期支护成环。
CD method, also known as the middle wall method, is used for shallow-buried large-section tunnel excavation. It is adopted under the condition that the geological conditions require the excavation of the section to be closed in time. The CD method is adopted to reduce the weak surrounding rock tunnel and long- Ministry of excavation span and excavation height, by adding temporary wall and other temporary wall support member, the formation of subdivision excavation, rapid support ring early closure ring, so that part of the excavation interlocking ring, and finally completed all sections of the excavation and Initial support ring.