Study On Earthquake Dynamic Response For Lining Of Highway Tunnel That Traverse Valley

This article chooses ganyanggou tunnel of Wenchuan-Maerkang highway in Sichuan Province as the engineering background.Based on this,selecting Wolong wave as ground motion input load,and using numerical simulation to study the dynamic response characteristics of two-wire bias tunnel.At the same time,because the exit of the Ganyanggou tunnel is located in the valley,therefore researching structural dynamic response of the tunnel when the tunnel through different valley.The following work was carried out and the corresponding results were obtained:(1)Intercepting the 5-26 s largest energy section of the Wolong wave,and using seismic wave processing software make wave filtering and baseline correction,then adjusting the intercepted and corrected Wolong wave acceleration time-history curve according to the earthquake fortification intensity of the tunnel site.Finally,the dynamic load input method of the numerical simulation is determined.(2)The numerical simulation software was used to simulate the dynamic response of the ganyanggou two-wire bias tunnel's exit,and dynamic response of the acceleration,displacement,stress and internal force of the two-wire bias tunnel's portal section were obtained.Taking the dynamic response value of the displacement of the vault as an example,the lateral,axial and vertical peak displacements of the vault in the high mountain side tunnel are-8.90911 cm,4.70253 cm and 8.36907 cm.the lateral,axial and vertical peak displacements of the vault in the low mountain side tunnel are-8.21675 cm,5.47023 cm and 8.84747 cm.Comparing the peak displacements of the vault's dynamic responses of the two-wire bias tunnel,it is found that the lateral dynamic response of the high mountain side tunnel is stronger than the low mountain side tunnel,which shows a clear bias effect.At the same time,it is found that the axial and vertical dynamic response of the shallow mountain side tunnel is stronger than that of the deep tunnel,which reveals the influence of the tunnel depth on the dynamic response of the tunnel structure.The deeper buried,the smaller the dynamic response of the tunnel structure.(3)Comparing the peak displacement in each direction of the monitoring nodes in the low mountain side tunnel of the two-wire biased tunnel,and extracting the peak acceleration of the tunnel arch positions as an example,the lateral,axial,and vertical peak displacements of the tunnel arch in the high mountain side tunnel are-7.31948 cm,5.40949 cm and 8.32736cm;the lateral,axial,and vertical peak displacements of the tunnel arch in the high mountain side tunnel are-6.82203 cm,5.12716 cm and 7.56093 cm.It is found that the peak dynamic response of the high mountain side nodes(right wall foot,right arch foot,and right arch waist)is stronger than the other side,and the bias effect is obvious.(4)Study the effect of different valley widths' the dynamic response of the tunnel structure when the tunnel crosses the valley topography.When the width of the valley bottom is 15 m,the lateral,axial,and vertical peak acceleration dynamic response of the tunnel vault are 7.2194m/s~2?8.0228m/s~2 and 9.0229m/s~2;when the width of the valley bottom is 30 m,the lateral,axial,and vertical peak acceleration dynamic response of the tunnel vault are 6.9998m/s~2,7.6682m/s~2 and 8.8147m/s~2;when the bottom width is 45 m,the lateral,axial,and vertical peak acceleration dynamic response of the tunnel vault are 6.6300m/s~2,7.5564m/s~2 and 8.5593m/s~2.Coming to the following conclusions,it was found that the dynamic response of the tunnel structure gradually increases when the width of valley bottom decrease.(5)Study the effect of different valley depths' the dynamic response of the tunnel structure when the tunnel structure crosses the valley topography.When the height of the mountain is 45 m,the lateral,axial and vertical peak acceleration dynamic response of the tunnel vault are 6.7056m/s~2,10.0583m/s~2,and 11.0065m/s~2;when the height of the mountain is 60 m,the lateral,axial and vertical peak acceleration dynamic response of the tunnel vault are 6.7998m/s~2,7.6682m/s~2 and 8.8147m/s~2;when the height of the mountain is 75 m,the lateral,axial and vertical peak acceleration dynamic response of the tunnel vault are 7.6031m/s~2,7.3643m/s~2 and 7.8725m/s~2.It is concluded that the lateral dynamic response of the tunnel structure increases with the increase of the height of the valley,but it was found that the axial and vertical dynamic response of the tunnel structure decreases when the height of valley increase.(6)Study the effect of different valley slope on the dynamic response of the tunnel structure when the tunnel structure crosses the valley topography.When foot slope is 65°,the lateral,axial and vertical peak acceleration dynamic response of the tunnel vault are 5.8377m/s~2,7.3974m/s~2 and 8.1940m/s~2;when the slope is 55°,the lateral,axial and vertical peak acceleration dynamic response of the tunnel vault are 6.9716m/s~2,8.1324m/s~2 and 8.6126m/s~2,respectively;when the slope is 45°,the lateral,axial and vertical peak acceleration dynamic response of the tunnel vault are 7.6275m/s~2,8.6126m/s~2 and 9.9715m/s~2.The following conclusions are reached,the dynamic response of the tunnel structure is the strongest when the slope of the valley is 45°,followed by the slope of 55°,and the weakest is slope of 65°.