Recently，It is a tunnel engineering tool jointly built by Railway Construction Heavy Industry and Shudao Group Sichuan Road and Bridge.——The first multi-support in southwest ChinaTBM“Shuchang No.1”，It's on the Xixiang ExpresswayTJBid Section 5 Successfully Held Stepping Ceremony，It marks the official entry of Yanyuan Tunnel of Xixiang Expressway.TBMConstruction phase。

It is understood that，“Shuchang No.1”Open typeTBMApplied to Yanyuan Tunnel Construction of Xixiang Expressway，The design section size of the tunnel adit is 8 in diameter..5 meters，Tunneling length 10 km，The tunnel has a herringbone slope along the route.。

The R & D team of China Railway Construction Heavy Industries focused on the analysis of the geological characteristics of Yanyuan Tunnel.，Combine more than 100 setsTBMDesign、Use、Construction experience，In the existing mature open typeTBMAdd steel segment support on the basis、Auxiliary propulsion、Innovated design of floor arch roofbolter etc.，To adapt to the fault fracture zone.、Large deformation of soft rock、Mud burst and water gushed、Low gas and other unfavorable geology，Make sureTBMWhen the geology is suitable，Sustained、Equilibrium、Fast tunneling。In case of unfavorable geology，Pass safely and steadily，The open type is improvedTBMAbility to cope with complex geological tunnels。

This time，Construction and Use of Yanyuan Tunnel of Xixiang Expressway“Shuchang No.1”Open typeTBM，It is an important measure to promote the safe and efficient construction of Xixiang Expressway Tunnel Project.，Railway Construction Heavy Industry will cooperate with Sichuan Road and Bridge of Shudao Group in the future.，Make joint efforts for the early completion of Yanyuan Tunnel。