某公路隧道破碎围岩塌方段处理及对拉锚杆的应用

Cross Anchor and Its Application in the Fracture Zone in Highway Tunnel

针对特大断面隧道采用双侧壁导坑法施工时预留核心土的稳定性问题,提出一种新的隧道施工工艺——对拉锚杆。通过在实践中检验,认为该工艺在双侧壁导坑法施工中是可行的。该工艺的应用,可以有效控制核心土的变形,减少砂浆锚杆及临时仰拱钢拱架的使用量,提高材料的利用率,在类似工程中具有较大的推广应用价值。

This paper puts forward a kind of new construction technology - Cross anchor. This technology is fitted for the double-side-wall heading constructing method in practice. Using this technology, we can control the deformation of the core rock effectively, reduce the consumption of mortar anchor, steel in temporary inverted arch and improve the utilization ratio of materials. This technology is worth popularizing and applying in similarity projects.