Field-test for environment vibration induced by shield tunneling in sand gravel layer

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (16) : 213-218.

TAO Lian-jin1，GUO Fei1，HUANG Jun2，LI Ji-dong1，AN Jun-hai1

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Abstract

The sand gravel layer in Beijing western region are of characteristics of shallow burial depth and large particle size. Environment vibration influence induced by shield construction in sand gravel layer is great. Field tests of acceleration vibrations were carried out in an interval tunnel of Beijing. Vibration data in construction process had been simultaneously collected by buried strata points, ground points and measuring points in tunnel. Vibration frequency domain characteristics and spatial attenuation law were drawn. Environmental influence assessment was conducted. It is shown that the vibration is mainly due to collision with cutter tool and gravel particles. Vibration caused by machines and transport vehicle have little effect on ground environment. Main frequency of vibration near cutter head is mainly distributed in more than 30 Hz. The main frequency of measuring point away from cutter head about 40 m on the surface cross-section has decayed to below 20 Hz. Amplitude of measuring points are related with relative position between cutter head and measuring points, which are in order as followed: points ahead of the cutter head, points on both sides of the cutter head, points behind the cutter head. Vibration level in vertical near the cutter head on ground is about 80 dB, it has decayed to 60 dB away from cutter head between 20 m to 30 m.

Key words

sand gravel layer / shield construction / vibration / field-test / attenuation law / frequency domain

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TAO Lian-jin1，GUO Fei1，HUANG Jun2，LI Ji-dong1，AN Jun-hai1. Field-test for environment vibration induced by shield tunneling in sand gravel layer[J]. Journal of Vibration and Shock, 2015, 34(16): 213-218

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