LONG-TERM STABILITY ANALYSIS OF DABAN DIVERSION TUNNEL BURIED IN SWELLING MUDSTONE
DAI Yonghao1，CHEN Weizhong1，YU Hongdan1，ZHANG Yuelin2
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Xinjiang Development and Construction Administration for Yili River Basin，Yili，Xinjiang 835000，China)
Abstract：Combining with the triaxial creep test and numerical simulation，the creep characteristics of the saturated swelling mudstone of Daban diversion tunnel are studied，and the nonlinear constitutive relationship of mudstone is put forward by fitting with the triaxial creep test results. The numerical simulation considering the tunnel¢s excavation，supporting and operation is also carried out. More attention is paid to the simulation of overbreak with tunnel boring machine(TBM)，the shield lining segment¢s cracking，failure，and the tunnel¢s long-term stability after supporting，which include with bolting，injection，secondary lining and steel bow member applied. In the end，the tunnel¢s long-term stability is evaluated，and the supporting design of the tunnel is verified. The gained results can provide the basis for the tunnel¢s support design of similar engineering projects.
