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

TAO Lian-jin;GUO Fei;HUANG Jun;LI Ji-dong;AN Jun-hai;The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology;CCTEB civil defense and Underground Space Institute;  

The sand gravel layers in Beijing western region are of characteristics of shallow burial depth and large particle size. The influence of environment vibration induced by shield construction in sand gravel layer is significant.Field vibration tests were carried out in an interval tunnel of Beijing. Vibration data in construction process were simultaneously collected at buried strata points,ground points and measuring points in tunnel. The frequency domain characteristics of vibration and the rule of spatial attenuation were analysed and the environmental influence assessment was discussed. It is shown that the vibration is mainly due to collision between cutter tool and gravel particles. The vibration caused by machines and transport vehicles has little effect on ground environment. The main frequency of vibration near cutter head is mainly distributed at more than 30 Hz. The main frequency at measuring point away from cutter head about 40 m on the surface of cross-section decreases to below 20 Hz. The vibration amplitudes at measuring points are related to the relative position between cutter head and measuring points,whose levels are in order as follows points ahead of the cutter head,points on both sides of the cutter head,points behind the cutter head. The vibration level in vertical direction on ground near the cutter head is about 80 d B and it decays to 60 d B away from cutter head about 20 m to 30 m.

【Fund】： 国家自然科技基金项目(41272337);; 北京市自然科学基金重点项目(8111001)资助
【CateGory Index】： U455.43

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