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Abstract Fault-rupture zone F2–1 of Guanjiao tunnel has done a series of research on optimizing support structure design of tunnel in fault-rupture zone. Displacement，pressure of surrounding rock，stress in the steel frames and axial force of rock bolts were obtained by monitoring in the section with original design scheme. The result indicates that construction process has significant effect on support structure；the steel frame stress exceeded steel strength；the distribution of surrounding rock pressure is uneven；the rock bolts do not work effectively. It is shown that the original support scheme could not meet the safety requirements；and it should be modified in time. By a comprehensive analysis of monitoring data，some optimizing methods such as increasing frame steel strength level，temporary supports，small pipe grouting at the side wall，etc. have been used in construction；and their feasibility also be verified by numerical analysis with software FLAC3D. From feedback of field implement and monitoring result，the effect of optimizing method is significant. These research results can provide theoretical basis and underlying data for support scheme in the fault-rupture zone.
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Received: 08 May 2013
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2014, Vol. 33 
