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洞口段安全快速开挖是洞挖施工的重点,对于洞口围岩地质条件不良,一般设计均趋向于采用小导管注浆或管棚支护的方案对洞口进行支护,此方法费用高、施工不便、工期长;而综合运用预裂爆破、超前锚杆、锁口锚杆、喷射混凝土等常规施工手段,并运用“新奥法”施工的核心理论指导施工,可以克服以上缺点,一般洞口段开挖施工均可采用此种方案完成。
The safe and rapid excavation of the hole section is the key point of the tunnel excavation. For the poor geological conditions of the surrounding rock of the hole, the general design tends to support the hole with the scheme of small pipe grouting or pipe shed support. This method has high cost and construction Inconvenience and long construction period. The comprehensive application of conventional construction methods such as presplit blasting, advanced rock bolt, lock bolt and shotcrete, and guiding the construction with the core theory of “new Austrian law” can overcome the above shortcomings. Excavation of the tunnel section can be completed using this program.