隧洞盾构支护荷载及管片选型

Support Stress Prediction and Liner Selection in the Excavation of Daban Diversion Tunnel

针对达坂隧洞不同围岩类别,分析普氏压力拱理论与太氏理论计算局限性与适用条件,对硬岩段采用现场地应力实测与有限元反演分析相结合方法确定支护荷载,并分析管片受力情况,从而对管片进行选型。工程应用表明,上述方法较为可行,施工效果良好。

This paper presents a comprehensive review of the applications and limitations of using Protodyakonov and Terzaghi theories in the different surrounding rock mass types in Daban Diversion Water Tunnel Project. For the excavation in hard rock mass segments, the supporting stresses are determined through the in-situ geo-stress measurement and numerical back analysis using finite element methods. The stresses in the liners can also be estimated and the appropriate liner type can be selected. The construction results indicate that this approach is reasonable.