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.
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Geng Qi received his B.E. degree from Shandong University, China in 2011. He is currently a Ph.D. candidate in the School of Mechanical Engineering at Xi’an Jiaotong University, China. His research interests include layout optimization and tunnel boring machine (TBM) cutterhead design.
Wei Zhengying received her Ph.D. from the School of Mechanical Engineering, Xi’an Jiaotong University, China in 2003. Dr. Wei is currently a professor and doctoral supervisor in the School of Mechanical Engineering at Xi’an Jiaotong University. Her research interests include the design and manufacture of microfluidic devices and TBM cutterheads.
Meng Hao received his B.E. degree from Shandong University, China in 2013. He is currently a master candidate in the School of Mechanical Engineering at Xi’an Jiaotong University, China. His research interest includes TBM cutterhead design.
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Qi, G., Zhengying, W. & Hao, M. Numerical and experimental method to determine the boring diameters of a two-stage TBM cutterhead to prevent rock burst. J Mech Sci Technol 28, 4613–4620 (2014). https://doi.org/10.1007/s12206-014-1029-y
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DOI: https://doi.org/10.1007/s12206-014-1029-y