内昆铁路邓家湾1#车站隧道3线大跨施工技术

邓家湾１＃隧道为车站３线大跨隧道，跨度大，结构扁平，地质复杂，施工难度大。在该隧道施工中，通过变更施工方法，以小导坑贯通揭示地质，及对资料的分析，确定了大跨段和台阶法通过的施工方案，为该隧道的安全顺利施工奠定了基础。

CONSTRUCTION TECHNOLOGY FOR THREE-LINE LONG-SPAN TUNNEL IN DENNGJIAWAN STATION NO.1 ON NEIKUN RAILWAY

Dengjiawan tunel No.1 is three-line long-span tunnel in station.It is of long span,flat structure,and complex geological conditions.And thus it is difficult to be constructed.During the construction of this tunnel,through a ltering construction method,revealing geological situations by the penetration of base tunnel,and analyzing the data from monitoring,We determined the data from monitoring,We determined the construction scheme of using bench method to pass through long-span section,which laid the foundation of safe and smooth construction of this tunnel.the successful completion of this tunnel offersuseful reference and guidance for the design and construction of later similar project.