Study On The Vibration Response And The Reduction Of Vibration And Noise Of High Speed Railway Tunnel

With the rapid development of high-speed railway in China, more and more high-speed railway tunnel are currently being built. High speed railway tunnel has a more stringent technical standard. In order to ensure that high speed trains can run continuously, safety and stably, more and more requirements are set for the dynamic stability of tunnel structure. It has become a very important subject to research and analyze the dynamic response of high speed railway tunnel. In this paper, high speed railway tunnel was taken as research object, through using the numerical analysis and the model test, the dynamic response and influence factors of the high speed railway tunnel under the vibrating load and the problem of vibration and noise that caused by high speed trains were studied systematically. The main research contents and conclusions are as follows:(1)Based on the vibration theory of tunnel-rock system and elastic-plastic theory, the calculation model of high speed railway tunnel was built by using Marc finite element software, after dynamic analysis, basic law of dynamic response of tunnel under high-speed train vibration load was obtained. The results show that dynamic response of lining structure and bedrock decreases with the increase of the distance from vibration source; influence of train vibration load on the following part of side wall is relatively larger than other parts. Through the comparison of the dynamic response of tunnel under two different driving conditions, the conclusion was obtained that the law of dynamic response of tunnel isn't affected by the driving conditions, but dynamic response of tunnel structure of traveling in lane is significantly larger than that of one-way traffic; strength failure of tunnel structure can't be caused by single diving of the train, lining structure damage is mainly controlled by the tensile strength.(2)After the analysis of the basic law of dynamic response of high speed railway tunnel, the influence factors on dynamic response were studied systematically. The results show that dynamic response of tunnel structure increase with the increase of train velocity, what's more, the change of acceleration and velocity with the train velocity is much more obvious; dynamic responses of lining are significantly influenced by surrounding rock condition and increase as train speed increase; the strength grade of concrete of lining has little influence on the dynamic response of the tunnel; the dynamic response of the tunnel decrease with the increase of thickness of invert of arch and filling layer; the increase of thickness of invert of arch and filling layer can reduce vibration to a some extent.(3) After analyzing the principle of vibration and noise, high speed railway tunnel was taken as research object to analyze vibration and noise reduction by model test The results show that vibration and noise increase with the increase of the train velocity; rubber damping material stuck on the rail waist and porous sound-absorbing material laid on the inside of the tunnel as two kinds of solutions all have certain vibration and noise reduction effect, and the former's combined effect of noise and vibration reduction is better than the latter; the two solutions which are applicable, reasonable and feasible have practical value. The experimental research has great significance in terms of vibration and noise reduction in high-speed railway construction, and provides a theoretical basis for High-speed Rail construction and the design of tunnel.