IV软岩隧道全环开挖施工技术研究

Study on Construction Technology of IV Soft Rock Tunnel

摘要: 以成兰铁路平安隧道IV软岩段施工为背景，从工艺原理、施工操作流程、关键技术和隧道变形等方面对全环法快速施工技术进行了试验研究，得出了全环开挖法减少了多次爆破对围岩的扰动，有效保护围岩自稳性能；隧道初支整体质量更易于控制，实现快速封闭，有利于隧道安全；有效利用大型机械设备施工，提高施工进度；减少人力资源投入，降低安全风险；减少了对运输车辆及风水电管路的影响。

Abstract: Taking the construction of IV soft rock section of Peace Tunnel of Chenglan Railway as the back-ground, the rapid construction technology of full-ring method is studied from the aspects of technology principle, construction operation flow, key technology and tunnel deformation. The results show that full-ring excavation method can reduce the disturbance of multiple blasting to surrounding rock and effectively protect the overall quality of initial support of tunnel. It is easier to control and realize fast closure, which is conducive to tunnel safety; it can effectively use large-scale machinery and equipment to improve construction progress, reduce human resources investment, reduce safety risks, and reduce the impact on transport vehicles and wind and water pipelines.