Abstract: This paper presents the construction techniques of Lingxi Tunnel undercrossing the Hongxian Canal. The Hongxian Canal which belongs to the QuanQiang Anshan rock formation has the characteristics of shallow buried and large water quantities.  The tunnel excavation applied the geological condition prediction technique for the rock mass conditions to be excavated; the large scale lead pipe grouting method was utilized in the excavated rock mass. Other excavation and supporting techniques, such as, circular excavation with core soils, the radial grouting and monitoring for the entire tunnel cross section, are also applied.

Key words: Geological Condition Prediction, Large Scale Lead Pipe Grouting, Circular Excavation with Core Soil, Construction Monitoring