Discussion on the article ‘‘Influence of rock brittleness on TBM penetration rate in Singapore granite” by Q.M. Gong and J. Zhao [Tunnelling and Underground Space Technology 22 (2007) 317–324] and ‘‘Response by the authors to R.M. Goktan discussion to the paper ‘‘Influence of rock brittleness on TBM penetration rate in Singapore granite” by Q.M. Gong and J. Zhao [Tunnelling and Underground Space Technology 23 (2008) 217–218]

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