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连拱隧道多为浅埋、偏压、软弱围岩地质条件,在施工中处理不当易出现变形、地表开裂,危及施工安全和隧道实体质量。本文以六寨至河池高速公路巴怀隧道为例,分析中导洞初期支护出现严重变形的原因,在对隧道初期支护大变形处治措施进行分析的基础上,针对性地提出支护改进加强、围岩加固、防排水治理这3方面的处治措施。处治结果表明措施可靠、中导洞变形得到有效控制,可为今后类似的工程提供指导与借鉴。
Multi-arch tunnel mostly shallow, biased, weak surrounding rock geological conditions, improper handling in the construction prone to deformation, surface cracking, endangering the construction safety and tunnel physical quality. This paper takes Bahuai tunnel from Hezhai to Hechi as an example to analyze the reasons for the serious deformation of the initial support in the middle of the pilot tunnel. Based on the analysis of the treatment measures for the large deformation during the initial support of the tunnel, Strengthen, rock reinforcement, waterproofing treatment of these three aspects of treatment measures. The treatment results show that the measures are reliable and the deformation of the guide tunnel is effectively controlled, which can provide guidance and reference for similar projects in the future.