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以Ⅳ围岩的SⅣb衬砌支护为例,结合米仓山长大隧道的实际施工过程,分析喷射混凝土存在的质量问题,总结出了提高喷射混凝土施工质量和初期支护施工效率的措施。
Taking the SⅣb lining support of Ⅳ surrounding rock as an example, the quality problems of shotcrete are analyzed in combination with the actual construction process of the Mikishashan long tunnel. The measures to improve the construction quality of shotcrete and the initial support construction efficiency are summarized.