地震作用下重叠矩形隧道地震响应规律研究OA

To investigate the seismic dynamic response of parallel overlapping tunnel structures,a nu-merical simulation model of the soil-overlapping tunnel system was established using finite element software.Considering the influence of seismic intensity,the seismic response of overlapping rectangu-lar tunnels with different horizontal spacings was studied from the perspectives of displacement,stress,and acceleration,and the dynamic results of the upper tunnel structure were compared with those of a single tunnel structure.The results showed that:(1)the seismic response of the upper tunnel structure was significantly affected by seismic intensity.When the seismic intensity was low,the dis-placement response of the upper tunnel structure approached that of the single tunnel structure;when the seismic intensity was high,the displacement response of the upper tunnel structure decreased,and the displacement reduction rate could exceed 17%.(2)The seismic response of overlapping tunnel structures changed in a fluctuating manner with increasing tunnel center spacing.When the tunnel cen-ter spacing was 0 or 1.5 times the transverse dimension of the tunnel,the seismic response of the up-per tunnel structure was relatively large.(3)When the tunnel center spacing was 1.0 times the trans-verse dimension of the tunnel structure,all seismic response of the upper tunnel structure was smaller than that of the single tunnel structure and was less affected by seismic intensity.(4)The maximum in-fluence range of the lower tunnel on the upper tunnel was 2.0 times the transverse dimension of the tunnel structure.Beyond this range,the seismic response of the upper tunnel structure approached that of a single tunnel structure.The results can provide a reference for the seismic design of overlapping tunnel structures.