研究目的:隧道洞口段施工是整个隧道工程施工的关键。针对隧道洞口的特点，如何做到超前思维，制 定出切实可行的进洞施工方案，使其既能减少隧道洞口边坡开挖和防护工程量，又能维护洞口的原生植被，同 时也能加快洞口段的施工进度，确保施工安全，对此进行施工技术研究。
研究结果:隧道洞口施工应根据现场地形、地质、水文条件，从环保角度出发，制定出科学合理的进洞方 案，采用合理的施工技术、方法和步骤开展施工。本文阐述的隧道大跨施工应选择变大跨为小跨的施工方法 (如CD法,CRD法等)和辅助施工方法(如环形开挖留核心上法、前置式洞口工法等)，有效地解决了隧道洞 口施工的安全隐患和环保问题。
Research proposes:The construction of tunnel entrance is the key part of the whole engineering. According to the characteristics of the tunnel entrance, how to think in advance to design feasible scheme for the construction of entering the tunnel is the most important step. This scheme should not only decrease the engineering quantity of the tunnel entrance slope excavation and the support, but also protect the protophyte around the entrance. It can simultaneously accelerate the project progress and ensure the construction safety.
Research results:The tunnel entrance construction should be based on site topography，geology, hydrology, from the environmental point of view, to develop a scientific and rational program hole, using a reasonable construction technology, methods and steps to carry out the construction. The paper explains that the long-span tunnel construction method should be changed into the small-span method(such as CD method, CRD method, etc.)and auxiliary construction methods(such as ring type excavation with conservation of core soil, advanced entrance construction method, etc.)，so as to effectively solve the potential safety problems and environmental problems.
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