this paper is from 2014, though I have found it very current. Available on Google Scholar.
The author is Meidong Han
https://oa.mg/work/10.3901/jme.2014.21.010
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://oa.mg/work/10.3901/jme.2014.21.010
[PDF] Study on the Critical Driving Speed of the Tunnel Boring Machine Cutterhead Based on the Dynamic Stability by Meidong Han · OA.mg · 10.3901/jme.2014.21.010
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