三台阶七步法在隧道出洞施工中的应用

Three Steps and Seven Steps in Application of Tunnel Hole Construction

结合工程实例,通过分析某隧道出口的实际围岩条件,对三台阶七步法和超前小导坑法两种出洞施工方案进行综合必选。切实做好施工过程的监控量测指导施工,运用三台阶法出洞施工工艺解决了该隧道出口端受地形条件限制、布置临时设施成本高、进度慢等施工难题,保证了施工安全和工程质量并减少开挖,最大限度地保护了环境。

The engineering example, through an analysis of the actual condition of surrounding rock tunnel exit, the three- step and seven-step method small pilot tunnel leading out of the hole and French construction plan for comprehensive mandatory. By a really good job of monitoring the construction process measurement to guide the construction, use of construction technology three-step method to solve the hole the outlet end of the tunnel by the terrain conditions, temporary facilities arranged high cost, slow progress of construction problems, to ensure the safety of construction and engineering quality ; reduction of excavation, to maximize the protection of the environment.