岔区大跨度隧道双侧壁导坑超前施工技术

Double Side Wall Pilot Advance Construction Technology in Large Span Tunnel in Fork Area

双侧壁导坑法施工工艺繁杂,交叉施工多,开挖和初期支护的进度受施工工法、劳动力配置、设备选型等因素的影响,与CRD法和台阶法相比,施工进度慢、效率低、成本高。而隧道岔区大跨段的开挖方法往往包括台阶法、CD或CRD法和双侧壁导坑法或其组合方法,因此,施工过程中如何合理组织施工就是需要解决的实际问题。本文以成渝客专新中梁山隧道大跨段施工为例,介绍双侧壁导坑超前施工工艺的优化,为类似工程提供借鉴。

Double side wall pilot construction is complex with a lot of cross construction. The progress of excavation and initial support is affected by factors such as construction method, labor force allocation, equipment selection and so on. Compared with the CRD method and the step method, it has slow construction progress, low efficiency and high cost. The excavation method of the large cross section of the tunnel turnout often includes step method, CD or CRD method and double side wall pilot method or combination method, so reasonable organization of construction is the practical problem to be solved. Based on the construction of the large span section of Xinzhongliang Mountain Tunnel of Chengdu-Chongqing passenger dedicated line, This paper introduces the optimization of the construction technology of double-side wall pilot, which can provide reference for similar projects.