Stability Analysis of Large Section Rocky Tunnel Support Structure

In order to study the stress characteristics of initial support and secondary lining large section tunnel solve problem cracking during operation. Taking in Zihong village, Qi County as research object, a numerical simulation method was used establish finite element model tunnel. So simulate analyze structure this Through second terms displacement, stress, plastic zone damage anchor shaft force, results show that excavation progresses, displacement on surface newly excavated profile is faster, especially at side walls arch footings, values are slightly larger than other characteristic points, but final stable converge, basically consistent with field monitoring results, which indicates system state. Therefore, process, special attention should be paid stability sidewalls will great practical significance for construction maintenance.