Seismic Response Simulation of Arch Reinforcement Tunnel Based on Fiber Reinforced Concrete Material Test
Based on a mountain tunnel,research on arch reinforcement based on fiber reinforced concrete under seismic action was carried out.Steel fiber,basalt fiber and carbon fiber admixtures were selected for fiber reinforced concrete material tests,and the optimal volume admixtures of fibers were determined.With the experimental data and numerical simulation of plastic damage,the responses of tunnel structure under seismic action with or without fiber reinforced concrete arch were analyzed.The results show that,without arch reinforcement,arch foot,spandrel and waist of the lining are prone to tensile crack damage under seismic action,and the relative displacements of spandrel,arch bottom and invert center are large.With three kinds of fiber reinforced concrete arch,the damage at spandrel and waist of overlapping structure is reduced,the development trend of tensile crack damage to both ends is inhibited,meanwhile,the relative displacement of spandrel,arch bottom and invert center is reduced,and the stability of tunnel structure is improved.Comprehensive considering the results of tensile crack damage of structure and relative displacement of monitoring points,steel fiber reinforced concrete arch with 1.5%volume admixture has the best reinforcement effect.
万方数据
维普
