Study On The Anti-vibration And Vibration Reduction Measures Of Crossing Tunnel Under High-Speed Train Load

Abstract:With the rapid development of high-speed railway construction in China, more and more crossing high-speed railway tunnel are currently being built. Train load would impact on the tunnel structure greater with the improve of the speed of high-speed trains, the vibration problems of high-speed train loads crossing tunnel structure have become increasingly prominent. According to the anti-vibration and vibration redaction problems of the crossing high-speed railway tunnel under the high-speed train loading, this dissertation systematically study the increase the thickness of the lining, rock reinforcement and damping layer three anti-vibration and vibration redaction measures on the high-speed train loads crossing anti-damping effect tunnel structure. This dissertation is granted from the Basic Research Development Program of High-Speed Railway(NO:U1134208). The main research contents and conclusions are as follows:(1) According to the vibration theory of tunnel-rock system, the loading spectrum of high-speed railway, the characteristic of high-speed railway crossing tunnel structure and anti-vibration and vibration redaction measures adopted, the numerical model was designed and builded.(2) From the middle pillar stress, lining structure displacement, acceleration and stress several aspects analyze the different vibration characteristics of the crossing tunnel structure cased by lining thickness, the increase in the thickness of the lining within a certain range of interchange tunnel structure can play a certain anti-minus vibration effect, but the anti-damping effect is not obvious, lining thickness can take60cm.(3) From the middle pillar stress, lining structure displacement, acceleration, stress analysis of several aspects analyze the different vibration characteristics of the crossing tunnel structure cased by the external supporting structure reinforcement of surrounding rock tunnel3m. Showed that rock reinforcement can play an effective anti-damping effect to Ⅳ,Ⅴ grade rock, but can not play an effective anti-damping effect to Ⅲ grade rock.(4) Analysing the change of vibration characteristics of crossing tunnel when the thickness of the vibration damping layer is5cm,10cm,20cm respectively and without vibration damping layer, it is concluded that effect of vibration damping of crossing tunnel structure which under the action of high-speed train load with different thickness of damping layer. Showed that additional damping layer can play a role in anti-vibration, damping layer thickness is recommended10cm.