In-situ Experimental Analysis of Acceleration Response of Mountain Tunnel Lining to Rubblization-Induced Vibrations

Abstract

Resonant rubblization technology is often utilized to rehabilitate deteriorated concrete pavements. Vibrations induced by a resonant breaker would produce detrimental effects on lining structures in tunnel during rubblization construction. The in-situ experiments were carried out in Yangjiao Mountain Tunnel in Zhejiang Province, China. First, the characteristics of rubblization-induced vibration are analyzed in time and frequency domains. Then effects of different testing points and pavement breaking positions on lining dynamic response in several frequency bands are taken into consideration to investigate vibration propagation rules. Later, the amplitudes of acceleration, vibration acceleration level (Val) and velocity in the examined cross section are presented to evaluate the dynamic response of lining structure in the procedure of resonant rubblization. The results show that the acceleration peak (3.52 g) appears on the lining arch foot while the maximum of Val (132.6 dB) and velocity (17.2 mm/s) show on the arch side. The presented data and results can be useful for design and safety assessment of resonant rubblization construction in mountain tunnel.