Experimental Study on Long-term Dynamic Characteristics of Heavy Haul Railway Tunnel Basement Structure

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (10) : 127-133.

WU Qiu-jun1，2，LI Zi-qiang1，2，YU Li1，2，HUA Yang1，2，WANG Ming-nian1，2

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Abstract

According to the characteristics of basement structure of heavy haul railway tunnel under train load is greater, based on Fuyingzi tunnel site large vibration test which achieved dynamic loading of 27t axle load of heavy haul train and long-term load, compared with the remote measured dynamic data，this paper proved the objectivity and accuracy of the test and discussed pressure dynamic response and long-term changes of the double line heavy haul railway tunnel basement structure that include ballast, invert filling, inverted arch structure and surface of the rock contact in the environment of the heavy axle load and high density transportation.The research shows that the vibration test can well simulate the dynamic characteristics of the basement structure of the double track heavy haul railway tunnel under the 27t axle load, the dynamic response and long-term effects in the vertical position of heavy load line on each structure are the most obvious and gradually weakened along with the vertical depth from top to bottom, long-term effect and dynamic pressure of each positon is influenced by the dynamic load of train, the greater the dynamic response, the more obvious the long-term effect. The experimental results can provide theoretical basis for stability evaluation and design parameters of the base structure of double track heavy -haul railway tunnel.

Key words

heavy-haul railway tunnel / base structure / vibration excitation test / dynamic pressure distribution / long-term effect

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WU Qiu-jun1，2，LI Zi-qiang1，2，YU Li1，2，HUA Yang1，2，WANG Ming-nian1，2. Experimental Study on Long-term Dynamic Characteristics of Heavy Haul Railway Tunnel Basement Structure[J]. Journal of Vibration and Shock, 2017, 36(10): 127-133

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