摘要
大水沟隧道是西昌至锦屏水电站辅助洞上线公路的最后一座隧道,最大开挖跨度达16.41m,开挖高度9.28m,高跨比仅有0.57,属典型的大跨扁平隧道。针对大跨扁平隧道的受力和变形特点,采用先超前支护,再分部开挖并及时进行支护,在施工过程中进行拱顶沉降监测等技术措施,确保了隧道施工安全。
Dashuigou Tunnel is the lattermost tunnel on the road that from Xichang to the auxiliary hole of Jinping Hydropower Station. It is a typical large-span and compressed tunnel, the maximal excavated span reaches 16. 41 m, the excavated height reaches 9. 28 m and the ratio of height-span is 0. 57 only. According to the working force and deformation characteristic of the large-span compressed tunnel, for one thing, it will adopt a timbering in advance in the course of construction, and then excavating partially and timbering timely, it must measure the sedimentation of the arch＇ s peak in the course of construction, ensure the safety of construction.
出处
《铁道建筑技术》
2006年第2期32-34,共3页
Railway Construction Technology
关键词
大跨
扁平隧道
施工技术
超前支护
large-span
compressed tunnel
technology of construction
timbering in advance
