NDLI: Numerical and experimental method to determine the boring diameters of a two-stage TBM cutterhead to prevent rock burst

Content Provider	Springer Nature Link
Author	Qi, Geng Zhengying, Wei Hao, Meng
Copyright Year	2014
Abstract	A two-stage tunnel boring machine (TBM) cutterhead with a pilot-enlargement boring method was presented to reduce the risk of rock bursts resulting from boring with a TBM with a large flat-face cutterhead. A reduced scale similarity experiment was designed on rock tunnel boring to determine the boring diameters of the two stages, and numerical simulation models were built. A micron X-ray computerized tomography system was adopted to examine the failure area of the excavated testing piece and validate the numerical models. Stress distribution and energy release rate (ERR) were used in the numerical simulations to evaluate the rock burst risk of the boring process. Experimental and numerical results show that rock burst is prone to occur in the upper, lower, and side areas of the surrounding rock around the tunnel, and risk increases with the lateral pressure coefficient and boring diameter. The optimal boring diameter ratio of stages 1 to 2 was determined between 0.55 and 0.59. Meanwhile, the ERR of the designed two-stage cutterhead is approximately 60% smaller than that of the flat-face cutterhead.
Starting Page	4613
Ending Page	4620
Page Count	8
File Format	PDF
ISSN	1738494X
Journal	Journal of Mechanical Science and Technology
Volume Number	28
Issue Number	11
e-ISSN	19763824
Language	English
Publisher	Korean Society of Mechanical Engineers
Publisher Date	2015-01-22
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rock burst risk Two-stage TBM cutterhead Similarity experiment Energy release rate Boring diameter ratio Mechanical Engineering Vibration, Dynamical Systems, Control Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering

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