Field Monitoring on Ground-Borne Vibration Caused by TBM Excavating in Mixed-Face Conditions
Publication: Geo-Congress 2022
ABSTRACT
TBM uses disc cutters to break the hard rock in mixed face conditions (MFC), which will induce dynamic loads both on the TBM and the working face. Besides, when the cutter moves from the soil into the hard rock, it will instantaneously bear an impact load at the soil-rock transition zone. These dynamic interactions involve the dissipation of energy into the ground and, therefore, cause significant levels of ground-borne vibration, potentially damaging the existing structures or causing human perception and disturbance. This work conducted field monitoring on the ground vibration induced by TBM excavating in MFC in Jinan, China. The monitoring scheme included five accelerometers buried in the ground along with depth. The waveform characteristic of ground-borne vibration was analyzed. Then the influence of the distance between the cutter and monitoring points on the vibration was investigated. Finally, the distribution and attenuation of ground vibration along with depth were fitted by the exponential function. The findings can help engineers better understand the ground vibration characteristics and conduct suitable countermeasures.
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Geo-Congress 2022
Pages: 554 - 561
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Published online: Mar 17, 2022
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