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本文以西四渡河隧道为依托,结合现场实际地形,采用异型套拱与反压挡墙综合工艺解决因地形引起的隧道洞口偏压问题,并提出具体的施工工艺。此综合工艺的施作,完美的体现了隧道“早进洞、晚出洞”的设计理念,在降低隧道边坡开挖高度的同时,真正做到了隧道零仰坡进洞,最大程度上减少对自然的破坏,有效地保护生态环境,且能够最大程度的保证隧道在暗挖过程中不出现拱顶塌方的危险。此综合工艺对于解决隧道洞口偏压问题可提供一定的借鉴。
This paper, based on the West Siduhe Tunnel, combined with the actual terrain on the spot, adopts the comprehensive technology of special-shaped arch arch and back-pressure retaining wall to solve the problem of the bias of the tunnel entrance caused by the terrain and proposes the specific construction technology. This comprehensive process of application, the perfect embodiment of the tunnel “early hole, late hole ” design concept, reducing the height of the tunnel slope excavation at the same time, truly tunnel zero slope into the hole, the maximum extent On the reduction of damage to nature, effectively protect the ecological environment, and to the maximum extent possible to ensure that the tunnel excavation process does not appear the risk of vandalism. This comprehensive process can solve the problem of tunnel entrance bias can provide some reference.