摘要：西四环暗涵浅埋暗挖隧洞二衬支护何时施做，关系到西四环暗涵工程、西四环路及周边建筑物安全，并对二衬支护质量、施工周期、工程造价有较大影响，对该课题进行了阐述。

关键词：南水北调；西四环暗涵；浅埋暗挖；一期支护；二衬支护时机

中图分类号：tv68；tv52 文献标识码：b 文章编号：1672-1683（2008）01-0048-04

timbering opportunity of the buried culvert under the west fourth ring road of the middle route project in the south-to-north water diversion

ouyang jian,fu yun-sheng,shi wei-xin,han yu

(beijing municipal institute of hydraulic engineering planning design and research,beijing 100044,china)

abstract:this paper ex