Abstract
Construction blasting in a tunnel in deep-buried soft rock will undoubtedly influence the cross section of the tunnel. Taking the deep-buried soft rock tunnel as the research background, a field monitoring experiment of the tunnel blast-induced vibrations is carried out. The cross section was established using 5 monitoring points to collect the peak particle velocity (PPV) data and frequency spectrum data. The results show that the maximum horizontal radial component of the blast-induced vibration velocity is greater than the maximum vertical component in the deep soft rock tunnel, and the maximum vertical component is greater than the horizontal tangential component. Due to the presence of an inclined shaft, the high domain frequencies have an amplification effect on the tunnel, while low frequencies do not exhibit significant amplification effects.
Highlights
In recent years, with the gradual advance of infrastructure construction, tunnel construction has extended from plain areas to mountainous areas
Shin et al (2011) identified the effect of blast-induced vibrations on adjacent tunnels and proposed a preliminary guideline for evaluating the protection zone for the blast vibrations that is based on a parametric study of the blast location, tunnel depth, and amount of explosives [6]
The results show that the abrasive water jet cutting method reduced the blast-induced ground vibrations and was more effective than the conventional drilling and blasting method in tunnel excavation [11]
Summary
With the gradual advance of infrastructure construction, tunnel construction has extended from plain areas to mountainous areas. Fu et al (2011) studied the blast-induced vibration rules of the arch crown and upper and side surrounding rocks behind the tunnel face and provided three empirical formulas [5]. Kim et al (2015) adopted experimental and numerical methods to assess the controlling effect of abrasive water jet cutting on blast-induced ground vibrations during tunnel excavation. The results show that the abrasive water jet cutting method reduced the blast-induced ground vibrations and was more effective than the conventional drilling and blasting method in tunnel excavation [11]. STUDY ON BLAST-INDUCED VIBRATIONS OF A TUNNEL CROSS SECTION. Previous studies have focused on the blast-induced vibration effects on tunnels, without considering the blast-induced vibration of the cross section of a tunnel in soft rock, neither in the amplitude domain nor in the frequency domain. Field tests were carried out to analyse the soft rock tunnel blast-induced vibration effects and provide a reference for the future blasting of deep soft rock tunnels
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